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1. Range 0 1 lt x lt ending position angle beginning position angle lt g gt INPUT Prompt number where lt g gt is pressed 1 2 3 4 1 Solar radius V o 2 Beginning position angle V 3 Ending position angle V 4 Delta distance K K K K N V Value Returned K Keyboard Input N Not Applicable 30 PROMPT CONSTRAINTS In keeping with the function specification of an arbitrary arc there are no constraints on the prompt values besides the normal range for each prompt The following prompt values are valid 1 The beginning position angle may be greater than or less than the ending position angle OUTPUT If reports have been specified in the Setup option a file named imagefilename ang will be produced where imagefilename is the current image file being worked on This report file will be located in the same directory as the image file The file will contain Grinnell x y coordinates solar coordinates and pixel intensities for each data point in the scan written in table form If more than one angle scan is performed the successive data point information will simply be appended to the file and separated from other scans by a header line If graphs have been specified in the Setup option then a graph of image intensity versus distance along the arc will be plotted The distance will be in terms of degrees Any resultant graph is in accordance with the constraints and procedures descr2. gt or degall 1 lt Return gt The O and 1 refer to the Grinnell labels Regular Grinnell users should place the following commands in their logout files These commands will deallocate the Grinnell Displays automatically at system logout degall 0 gt dev null degall 1 gt dev null 2 2 Features and Options The following section describes the features and options of the IAP program available to the user Options defined in menu option 1 Setup of Parameters and Options are also included lt Esc gt The escape key is used to move back one menu level With the exception of the help menus the IAP program consists of only two menu levels the main menu and its respective sub menus Therefore primary use of the escape key will be to move from any sub menu back to the main menu If the escape key is pressed at the main menu the program will be terminated The special case of the help menus will be discussed in section 2 3 lt Return gt The return key is used to confirm any data typed in by the user That is the program will not respond to any input data until a return signal has been received Before the return has been pressed the user may edit the input data as needed If a return is pressed with no data before it one of two things will occur An error message may be generated and the user directed to type in a valid input or a default value will be assumed and filled in at the appropriate prompt lt Delete
3. in the specific sub menus For a graph to be produced there must be a minimum of two data points and a maximum of 1270 If graphs with a single curve have been specified then the graph will appear on the screen after the scan is completed If graphs with n curves have been specified then the graph will appear after n scans are completed The user 16 has the option of saving either type of graph by typing y lt Return gt Although a message in the status window reminds the user of this before the graph is displayed the user should wait until the graph is finished before deciding to save The saved graph will be placed in a file named imagefilename meta where imagefilename is the name of the current image being worked on The file will be located in the same directory as the image file If the user does not want to save the graph a simple lt Return gt will bring back the appropriate scan menu 17 3 2 Exit Option Function Allows user to exit from IAP program Operation User simply types 0 lt Return gt at main menu prompt User will be notified that program is ending through a message in the status window Comments Pressing lt Esc gt at main menu will also allow the user to exit from the IAP program lt c gt and lt z gt provide emergency exit options See section 2 2 for more information 18 3 3 Setup of Parameters and Options Function Allows user to setup various IAP program parameters Operatio
4. input which are true or definite when lt g gt is used at the Beginning solar radius prompt The first V in the column indicates that a value is returned as expected for the Beginning solar radius prompt The second V in the column indicates that a value is also returned for the Beginning position angle prompt Therefore when lt g gt is used at the Beginning solar radius prompt both the beginning radius and the beginning position angle are returned at the same time The dashes following the second V indicate that nothing definite can be said about the input to prompts 3 or 4 The last value a K indicates that the user must use the keyboard to input data for the Delta distance prompt The second column represents those conditions which are true or definite when lt g gt is used at the second prompt Beginning position angle The first value a K indicates that the user must use the keyboard to type in a value for the Beginning solar radius prompt But why is this true Well if the user did not use the keyboard for the first prompt then the only other option would be to use lt g gt However as mentioned above if lt g gt is used at the first prompt then values are returned for the first prompt and the second prompt Therefore it would be pointless to discuss trying to use the lt g gt option at the second prompt when it has already been filled in Consequently the only
5. lt 360 0 4 Delta distance User types in value for distance between each data point along the radial line This value will be in terms of solar radii The intensity of the image will be calculated at each of these data points Range 0 0 lt x lt 2 0 lt g gt INPUT Prompt number where lt g gt is pressed 1 2 3 4 Beginning solar radius Ending solar radius V Position angle Delta distance l V Value Returned K Keyboard Input N Not Applicable PROMPT CONSTRAINTS in keeping with the function specification of an arbitrary line there are no constraints on the prompt values besides the normal range for each prompt The following prompt values are valid 28 1 The beginning solar radius may be greater than or less than the ending solar radius OUTPUT if reports have been specified in the Setup option a file named imagefilename rad will be produced where imagefilename is the current image file being worked on This report file will be located in the same directory as the image file The file will contain Grinnell x y coordinates solar coordinates and pixel intensities for each data point in the scan written in table form If more than one radial scan is performed the successive data point information will simply be appended to the file and separated from other scans by a header line If graphs have been specified in the Setup option then a graph of image intensity versus distance al
6. the analysis routines These routines currently consist of seven menu options and encompass a variety of data extraction and reduction techniques The specifics of each of these options is described in chapter 3 There are two menu options Image Difference and Define Macro which do not fit neatly within the program procedure described above Image Difference is unique in that it is the sole analysis routine which may be performed without first specifying the image data to be utilized In fact since the routine s output is an image file there may be times when it will be necessary to run this routine before the specification of an image file Define Macro is more of a utility routine than an analysis routine It can be thought of as a special recorder which records all keyboard input As a result the user may start the program with this option to attain a certain amount of program automation Please refer to chapter 3 for more information on both Image Difference and Define Macro E Exiting IAP Program To exit the IAP program the user may either type 0 lt Return gt at the prompt of the main menu or hit the lt Esc gt key while at the main menu Other emergency exits are discussed in section 2 2 F Deallocation of Grinnell Display if the user is finished using the Grinnell Display be sure to deallocate the Grinnell so that other users may have access to the device Use the degall command as follows degall 0 lt Return
7. the overlay channel to be used This overlay channel will be used to display analysis scans on top of the image By simply erasing the overiay channels the program allows the user to perform a variety of analysis routines on the same image without having to reload the image for each routine Each overlay channel is associated with a particular color as 19 follows 8 Blue 9 Green 10 Red 11 White 5 Erase overlay between s cans or i mages or n either This option allows the user to select when the overlay channels should be erased If the user types s the overlay channels will not be erased until the user moves to a different analysis scan If the user types i the channels will not be erased until a new image is loaded If n is typed the overlay channels will not be erased at all 6 Should graph s be produced on line radial and angle scans y n User types y for yes or n for no to select whether or not graphs should be produced when performing line radial or angle scans If yes then a line graph will be plotted and displayed on the terminal screen each time one of the mentioned scans is executed The user also has the option to save any of the graphs produced in a metacode file The abscissa and ordinate values and relationships are dependent on the specific scan being performed See sections 3 5 Line Scans 3 6 Radia Scans and 3 7 Angle Scans for specific graph information If user elects not to produce graphs cursor w
8. the same filename is input for prompts 1 and 2 then a warning message that the user is subtracting an image file from itself will be displayed Nevertheless an output file will still be created 40 3 12 Define Macro Function Allows the user to record keyboard input while program is being used This recorded input known as a macro can then be used as input to the program to achieve a certain level of program automation Operation Input Exit Define macro Execute macro Save defined macro Execute saved macro WNO Select MACRO option defined User types number between 0 and 4 inclusive to choose appropriate option The function of each option is as follows Exit Option simply exits back to main menu Define Macro When this option is chosen a message will appear in the status window indicating that the program is remembering or ready to record keyboard input The user may then use lt Esc gt to exit back to the main menu The user may now use the program as normal and the program will record all keyboard input When all routines to be recorded have been executed the user should once again select the Define Macro option Upon selecting this option a message stating that a keyboard macro has been defined will appear in the status window This macro will be defined until the user exits the program or defines a new macro The user may then choose options 2 or 3 to execute the macro or Save it to a file
9. to exit the program The user may wish to check the terminal settings and attempt to run the program once again D Running IAP Program Once the IAP main menu is displayed on the terminal screen the program is ready for use This section will not describe the operating specifics of the IAP program that will be left to section 2 2 This section will describe the overall IAP program flow Hopefully this will give beginning users a basic understanding of how to approach the program The structure of the IAP user interface is based upon a menu driven style The main menu constitutes the top level of this system All other menu options are sub menus with respect to the top level These sub menus run only one leve deep therefore there are no other sub menus located within the first set of sub menus Each and every menu is associated with a distinct full terminal screen display That is there will never be more than one menu displayed at any one time on the terminal screen Direct access between sub menus is not supported by IAP Therefore access between sub menus will involve switching back to the main menu as an intermediary step The exception to this is access to the on line help although technically the on line help is a feature rather than a menu option While it may not be possible to define a rigid procedure for IAP operation the following steps approximate standard IAP operating procedure 1 Initialize Program 2 Load Imag
10. Allocation of Grinnell Display A Grinnell Display is used to display Mark Ill image data Each Grinnell Display consists of a monitor memory channels color tables and a joystick contro unit Memory channels are divided into image and overlay channels There are currently two Grinnell devices available These are labeled 0 and 1 and are located in room 288 Grinnell O contains three image channels labeled 0 1 and 2 Grinnell 1 contains four image channels labeled 0 1 2 and 3 Besides this difference the two devices are virtually identical and the IAP program is fully supported on either device For further information on the Grinnell Display System please see Beginner s Guide to Image Processing by Rose Reynolds Before using a Grinnell Display the device must first be allocated This allocation cannot be done within the IAP program Therefore if a Grinnell Display is to be used the user must allocate the appropriate Grinnell before running the IAP program If no Grinnell is to be used then the user may proceed to start the IAP program To allocate a Grinnell Display the gall command is used as follows gall O lt Return gt or gall 1 lt Return gt The O and 1 refer to the Grinnell labels While both Grinnell Displays may be allocated at the same time and used by the IAP program the program was not designed to provide any benefits or advantages from such a setup After issuing the gall command no message is retu
11. Execute macro This option is used to execute any macro which has been defined since program startup By executing a macro the user is telling the program that all input will now come from the recorded information in the macro Of course one of the main benefits of using a macro is the ability to execute the macro repeatedly 41 Therefore once this option has been chosen the following prompt will appear in the status window Number of times to execute macro 1 100 The user should enter a number between 1 and 100 inclusive or a lt Return gt to default to 1 to indicate the number of times the macro should be executed Once this number is entered the program will simply use the recorded macro information for input The same routines used in defining the macro will be executed as many times as the user has specified Of course it may be wise to execute the macro a few times to be sure it is working as expected before specifying a large number Save defined macro Recall that any defined macro is only valid until program end or until a new macro is defined However the user may use this option to save the defined macro to a file so that it may be used in the future Assuming a defined macro exists this option simply displays the following prompt in the status window Save MACRO filename The user should type in a filename including path if desired which macro will be saved to The user may then use option 4 to execute th
12. NCAR TN 318 1A NCAR TECHNICAL NOTE July 1988 Integrated Analysis Package for Mk lil K coronameter Observations A User s Manual S Archuleta University of Colorado R Beutner University of Colorado HIGH ALTITUDE OBSERVATORY NATIONAL CENTER FOR ATMOSPHERIC RESEARCH BOULDER COLORADO CONTENTS Forward 1 INTRODUCTION 1 1 Integrated Analysis Package Description 1 2 User s Manual Getting Started 2 IAP BASICS 2 1 Getting Started 2 2 Features and Options 2 3 On line Help 3 IAP MENU OPTIONS 3 1 Introduction 3 2 Exit Option 3 3 Setup of Parameters and Options 3 4 Image Input Output 3 5 Line Scans 3 6 Radial Scans 3 7 Angle Scans 3 8 Positional Information 3 9 Line Lengths and Integration 3 10 Area Determination and Integration 3 11 Image Difference 3 12 Define Macro APPENDIX References iii 45 51 FORWARD The following document describes the use of the Integrated Analysis Package LAP the primary software tool for visual graphical and quantitative numerical analysis of solar coronal data acquired with the Mark III Coronameter IAP was written for use on a VAX 11 780 haovax HV running Berkley Unix version 4 2 but it can easily be ported to other Unix machines As an accompaniment to this Technical Note there also exists an IAP Maintenance Manual providing in house programmers a road map to the code The opportunity to produce IAP resulted from a request from Dr Evi Nemeth to provide realisti
13. ater than or less than the ending solar radius 2 The beginning position angle may be greater than or less than the ending position angle OUTPUT Besides prompt values solar coordinates the line length and if calculated integrated intensity will be output to the terminal screen for each line length routine executed These values will be displayed in the main window under the prompts If reports have been specified in the Setup option a file named imagefilename lin will be produced where imagefilename is the current image file being worked on This report file will be located in the same directory as the image file The file will contain Grinnell x y coordinates and solar coordinates of the line endpoints line length in terms of solar radii and if calculated the integrated intensity of the line This data will be written in table form If more than one line length routine is performed the successive line information will simply be appended to the file and separated from other scans by a header line 35 3 10 Area Determination and Integration Function An analysis routine which returns the area of a wedge in terms of solar radius 2 and cm Optionally the user may also have the routine return the image intensity as integrated within the wedge Operation KEYBOARD INPUT Initial Prompt Calculate integrated brightness y n User types y for yes n for no or lt Return gt for default of no to indicate whether or
14. backward within the list and thereby set the current image to be worked on The value of this feature lies in the fact that the user may use the lt f gt and lt b gt commands within any analysis sub menu This eliminates the need to constantly go back to the Image Input Output sub menu to load a new image into memory Of course it is also possible to add new image files to the list at any point during program execution There are currently no provisions to display the internal list or to save this list to a file To maximize the effectiveness of the lt f gt and lt b gt commands the internal list is set up as a Circular list This allows repeated use of either lt f gt or lt b gt without ever reaching an end file Upon reaching the last input file when using lt f gt to move forward within the list the program simply recycles back to the beginning Likewise the program moves from the beginning input file to the last when using lt b gt The user should be clear on one important distinction between prompts number 1 and 2 Prompt number 2 a ways deletes any previously defined internal list when it is used Prompt number 1 does not delete previously defined lists so this prompt should be used when the user wants to expand an already defined list The new image file s will simply be added to the end of the list The user may make use of both prompts by starting with prompt 2 and then adding successive file
15. c coding projects to students of her computer science course Computer Applications CS 420 421 in the School of Arts and Sciences at the University of Colorado In response the idea and specifications of JAP were devised at the High Alti tude Observatory Students Richard Beutner and Steven Archuleta then developed and completed the package as their Senior Project in the course Input to the IAP program is reformated Mark II image data These images are the end result of processing with existing software tools written by Jay Chalmers and described in NCAR Technical Note NCAR TN 247 1A Alice Lecinski High Altitude Observatory Boulder Colorado Chapter 1 INTRODUCTION 1 1 Integrated Analysis Package Description The Integrated Analysis Package IAP is a program designed to provide on line real time analysis of data produced by the Mark Ill K Coronameter The program integrates a variety of display and analysis routines into one package and provides an interactive environment through a menu driven user interface To facilitate program operation a genuine attempt has been made to keep options and features as consistent as possible throughout the program This interface should allow the user to concentrate on data extraction and analysis rather than program operation IAP is currently set up to run within the constraints of the VAX750 HV system and all image displays are provided through the use of the Grinnell display system Whil
16. can quickly change the current image file being worked on lt f gt moves forward one image file with respect to the order in which the files were originally loaded and loads this file into memory If a Grinnell Display is being used the image is also displayed lt b gt simply moves backward one image file Since there is no specific prompt for using the lt f gt and lt b gt commands the user is allowed to use the commands when the cursor is at any input prompt To maximize the effectiveness of the lt f gt and lt b gt commands the image file list is set up as a circular list This allows repeated use of either lt f gt or lt b gt without ever reaching an end file Upon reaching the last input file when using lt f gt to move forward within the list the program simply recycles back to the beginning input file Likewise the program moves from the beginning input file to the last when using lt b gt See sections 3 1 and 3 4 for more information regarding the lt f gt lt b gt commands 2 3 On line Help This section will describe the on line help feature of the IAP program Upon accessing the help feature the user will be provided with information pertaining to the appropriate sub menu This information is simply a synopsis of the information provided in chapter 3 and therefore should not be considered a substitute for 9 the user s manual For most analysis routines this in
17. cludes a description of the routine prompt input ranges output report and graph filenames if any and features unique to the routine To access the help feature the user simply types at any input prompt Note that no lt Return gt is needed after the question mark Specific operation of the help feature depends on whether the user accesses help from the main menu or a sub menu If the user accesses help from the main menu then a help menu appears on the screen This help menu is very similar to the program main menu Therefore the user simply types in the number of the option desired and an appropriate help screen is displayed Upon exiting the help screen by hitting the space bar the help menu is again displayed The user may now choose another option or type 0 lt Return gt or lt Esc gt to exit back to the main menu If the user accesses help from a sub menu then the help screen for that particular sub menu is immediately displayed Upon exiting the help screen the user is returned to the same point at which help was first accessed Furthermore any data input before help was accessed will be retained Since no lt Return gt is needed after the question mark to access help the user may even access help in the middle of inputting data to a prompt 10 CHAPTER 3 IAP MENU OPTIONS 3 1 INTRODUCTION This section will provide a foundation for utilizing the IAP routines and in describing the layout of the manual as it pe
18. e Data 3 Perform Analysis Routines Step 1 involves defining a set of user preferences This is achieved through menu option 1 Setup of Parameters and Options These preferences include items such as whether a Grinnell Display is to be used whether reports should be produced or how to determine image intensities See section 3 2 for more information Once these preferences have been set they will be applied throughout the program until program execution has been suspended Of course the settings may be changed at any point during program execution While default settings are provided so that the user may skip this step it is likely that the user will want to perform this option first The next step involves the specification of image files to be analyzed This is provided for by the use of menu option 2 Image Input Output It should be clear that no analysis routines may be run without first defining an image or list of images With consistent use of the Grinnell Display it is easy to think of this option as an image display routine However this option must be performed independent of whether a Grinnell Display is used or not While additional images may be added at any point during program execution it is to the user s advantage to list all images to be worked on at one time This is due to a feature lt f gt lt b gt which will be explained in section 2 2 The final step in the operating process is of course to perform
19. e image display is a vital component of IAP it should be noted that all analysis functions may be run regardiess of whether a Grinnell Display is used or not Of course the value of this feature will be dependent on the user s familiarity with the image data 1 2 User s Manual Getting Started The purpose of this manual is to provide the user with a detailed description of the setup and operation of the IAP program The manual assumes that the user has access to the IAP program and is familiar with the basics of the Unix operating system All users should read chapter 2 and section 3 1 completely Chapter 3 may then be referred to as needed Users may also wish to skim through the APPENDIX for graphic examples of analysis routines presented in chapter 3 Chapter 2 provides all the details necessary to run IAP This includes program initialization startup general description of features and options and program exit The user interface is also covered along with information regarding input output procedures Lastly instruction for use of the on line help is provided Chapter 3 provides a detailed account of each menu option available in IAP This includes a description of the routine 1 available functions and options input data constraints output details and any special information regarding the routine The APPENDIX provides graphic examples of Grinnell image displays for each analysis routine These examples can be used in c
20. e to the next appropriate prompt If the prompt being filled in happens to be the last prompt then the routine will be executed immediately The absence of the Grinnell cursor on the display indicates that lt g gt may not be used for that particular prompt There are a few features concerning the lt g gt command which the user should be aware of Upon entering an analysis routine the Grinnell cursor is always located in the center of the display If the routine is executed more than once multiple scans then at the beginning of each new scan the Grinnell cursor will be located at the last point specified in the previous scan Also in most cases the Grinnell cursor must be located somewhere on the image to be used This is not necessarily true for specifying angles however To input an angle only the user may also position the Grinnell cursor in the portion of the display which is less than one solar radius the black disk in the middle of the display If the cursor is exactly in the center then 360 degrees will be returned for the angle Any offset from the center will simply represent the normal angle specified by that point Despite this fact the user is encouraged to move the cursor to a point which is actually on the image The status window is used to display any error or status messages Most error messages regard incorrect input data whether it be input by keyboard or through use of lt g gt Status messages are
21. eater than or less than the ending solar radius 2 The beginning position angle may be greater than or less than the ending position angle OUTPUT lf reports have been specified in the Setup option a file named imagetilename line will be produced where imagefilename is the Current image file being worked on This report file will be located in the same directory as the image file The file will contain Grinnell x y coordinates solar coordinates and pixel intensities for each data point in the scan written in table form If more than one line scan is performed the successive data point information will simply be appended to the file and separated from other scans by a header line lf graphs have been specified in the Setup option then a graph of image intensity versus distance along the line will be plotted The distance will be in terms of solar radii Any resultant graph is in accordance with the constraints and procedures described in section 3 1 27 3 6 Radial Scans Function An analysis routine which obtains the intensity of the image as a function of position along an arbitrary radius Operation KEYBOARD INPUT 1 Beginning solar radius User types in solar radius of beginning radial line endpoint Range 10 lt x s 2 18 2 Ending solar radius User types in solar radius of ending radial line endpoint Range 10 lt x lt 2 18 3 Position angle User types in position angle of radial line Range 0 0 lt x
22. for each prompt The lt g gt input consists of a value table and comments if the table is unclear Prompt constraints are included to clarify the relationships between the input prompts These constraints specify whether the values for one prompt will affect the ability to input a certain value for another prompt The output section includes information on files graphs or terminal screen data output by the routine The notes section includes any other information about the routine that the user should know The lt g gt value table is used to avoid lengthy descriptions of lt g gt options which might be somewhat confusing A column of the table represents the prompt where lt g gt is used A row of the table represents the prompt itself Values within the table represent conditions which are true about the prompts and or the ability to use lt g gt at that prompt The easiest way to explain the table is through example The following table represents the lt g gt input for the line scans menu option Prompt number where lt g gt is pressed 2 3 4 5 lt 1 Beginning solar radius 2 Beginning position angle 3 Ending solar radius lt lt lt X 4 Ending position angle V V 5 Delta distance K K K K K N V Value Returned K Keyboard Input N Not Applicable The easiest way to read the table is columnwise The first column represents those conditions regarding prompt
23. gt lt u gt As mentioned above the user may edit any data entered before a lt Return gt is pressed The delete key and u command are used to edit the data lt Delete gt deletes one character at a time while lt u gt deletes the entire line After deleting the necessary characters the user simply retypes the correct information lt r gt If an IAP menu is not properly displayed for some reason the user may press the r command to redraw the current screen If the screen remains abnormal the user may wish to try switching to a different menu or consider restarting the program lt C gt lt 2 gt The c and z commands can be thought of as emergency exits for the program If the program should freeze up not accept normal input or if the user needs to stop the execution of a routine before it is done the user may try lt c gt This will prompt the user for confirmation to end the program and then exit the program if confirmation is received The IAP program process is terminated If the program will not even respond to lt c gt then the user should try lt z gt This command will exit immediately to the Unix prompt However the user should note that the IAP program process is left running To terminate the process the user should type ps gx at the Unix prompt This command will give a list of process id numbers and descriptions Locate the IAP process and note its id number pid Now type kil
24. hen the cursor must be moved through the complete menu using the lt Return gt key Upon reaching the end of the menu the cursor moves back to prompt number one Operation is now the same as in situation 3 above 23 3 4 Image Input Output Function Allows user to specify which image file or image file list is to be worked on l Operation INPUT User should use the lt Return gt key to move between the two prompts The menu will not exit until the lt Esc gt key is pressed No default values are defined for either prompt 1 Image filename User types in a single filename of a Marklll image to be worked on The program will search for the file in the current directory unless the user includes a specific path along with the filename The user may use this prompt repetitively to specify as many files as desired All files specified will be used to create an internal list This list can then be accessed using the lt f gt lt b gt commands The first file specified will also be automatically loaded into memory and if a Grinnell is being used displayed on the Grinnell Successive files will be added to the internal list but not loaded into memory or displayed until accessed through the lt f gt lt b gt commands Note that the internal list created through this process is only kept active through the execution of the program There are currently no provisions to save this list to a file 2 Image list fi
25. ibed in section 3 1 NOTES The user should note that regardless of the relative values of the beginning and ending position angles the scan will always be produced counterclockwise from the specified beginning position angle In this way the user is allowed to specify an ending angle which is smaller than the beginning angle as is the case when defining an arc which crosses the position angle of 0 degrees The point of the arc located at the ending position angle may or may not be included in the scan depending on whether or not there are an integral number of delta units contained within the length of the arc 31 3 8 Positional Information Function An analysis routine which allows the user to position the Grinnell cursor on a feature a pixel and return the coordinates and intensity of that pixel Two sets of coordinates are returned one in terms of Grinnell x y coordinates and the other in terms of solar radii and position angle Operation KEYBOARD INPUT While this particular routine is designed to take advantage of the Grinnell cursor and lt g gt features keyboard input is allowed The nearest pixel to the position specified will be chosen and solar coordinates and intensity returned If a Grinnell is used the Grinnell cursor will move to the specified pixel 1 Position angle User types in position angle of desired point Range 0 0 lt x s 360 0 2 Solar radius User types in solar radius of desired
26. iginal filename plus a ascii suffix For example if the user saved the responses to a file named HAOsetup then a file named HAOsetup ascii would also be created 12 Convert to physical mass density and pB y n This option is not currently implemented within the IAP program In the future calibration information located at the beginning of the image file will be used to convert raw image data to real physical parameters such as pB density and mass OUTPUT Output is limited to any binary file created through option number 11 An ascii version of this same file is also created These files will be located in the user s current directory unless a path is specified NOTES Use of the Setup menu can be divided into four situations which are described below 22 1 The user at any point of program execution moves to the Setup menu and chooses to read the setup parameters from a previously defined file This is discussed in the input section under initial prompt and option number 11 It is important to note that once the filename and a lt Return gt have been input the program sets the appropriate parameters and immediately exits to the main menu 2 The user moves to the Setup menu for the first time changes a few parameters then hits the lt Esc gt key In this case the program will retain any parameters which were typed in and assume default values for the rest of the parameters which were skipped Since the lt Esc g
27. ill appear in the area below the input prompts Procedural information such as pressing lt Space gt to continue is displayed at the bottom of the main window when appropriate Data entry is made either through the keyboard or as a result of using the Grinnell cursor joystick and the lt g gt command If the keyboard is used then a lt Return gt at the end of the prompt will enter the data and move the cursor on to the next prompt The user may edit the data anytime before pressing the lt Return gt key but may not move back afterwards When entering the last prompt the lt Return gt will enter the data and immediately start to execute the routine If a Grinnell display is being used then the user may enter data by using the lt g gt command With the cursor at the appropriate prompt the user moves the Grinnell cursor crosshairs by using the joystick located on top of the terminal The intersection of the crosshairs indicates the exact position which will be referred to by the program Once the cursor is in the appropriate location on the image in terms of referring to a position which answers the prompt the user may hit lt g gt The prompt will now be filled in with the 12 appropriate value in terms of either position angle or solar radius Note that lt g gt may also return two values a position angle and a solar radius so that a second prompt is automatically filled in The cursor will then mov
28. ill skip to prompt number 9 7 if so do you want multiple curves per plot y n User types y for yes or n for no to select whether or not multiple curves should be done per each plot This option allows the user to display the results of multiple scans upon a single graph The user will specify the number of curves to plot through prompt number 8 In the case of multiple curves the graph will not be produced on the terminal screen until the specified number of scans are completed The user may still elect to save the produced graph to a metacode file The user should note that when using multiple curves the delta distance should be kept the same for each scan The user will probably want to use the same analysis routine for each of the scans also If the user chooses to switch between analysis routines the graph labels pertinent to the first scan will be used in the resulting graph If the user chooses not to use multiple curves the cursor will skip to prompt number 9 8 If so what is the maximum number of curves per plot 2 6 User types number between 2 and 6 inclusive As mentioned above this option allows the user to specify how many curves per plot should be done Although the number specified is the maximum number of curves allowed it also represents the minimum number of 20 scans the user must perform before a graph is displayed on the terminal screen 9 Produce report files of the positions and intensities y n Use
29. is saved macro in the future Execute saved macro This option is used to execute any macro which has previously been saved to a file Upon choosing this option the following prompt appears in the status window Save MACRO filename The user should type in the filename and path if necessary of the macro to be executed Having entered a valid filename operation will proceed as described above for the execute macro option i Note that lt g gt input should not be used when defining a macro This is due to the fact that the program cannot keep track of Grinnell cursor movement Of course the user can always run the program before defining the macro using lt g gt input and record all values returned Then the user can define a macro and simply type in 42 the values which were returned by the lt g gt command OUTPUT Output is limited to any file which is created through the use of option 3 Save defined macro NOTES Perhaps the greatest benefit of using a macro in the IAP program is the ability to perform identical analysis routines on multiple images The user can simply include a lt f gt or lt b gt command at the end of the analysis routines when defining the macro Each time the macro is run a new image file will be loaded at the end of the routines This of course assumes that the user has specified more than one image file in the Image Input Output option The macro can then be run as many ti
30. ity it represents The intensity represented increases from the bottom to the top of the bar The user should also be aware that any image on the Grinnell Display at program exit will be left displayed This is normal procedure in using the Grinnells Therefore do not be surprised 11 when turning on the Grinnell Display to see some type of image present B Sub menu_ Information Figure 3 1b illustrates a generic sub menu as displayed on the terminal screen The screen is divided into three windows header window main window and status window The screen shown represents the majority of the sub menus although a few do not contain header windows The header window is simply a reminder to the user of the lt f gt lt b gt lt Esc gt and help commands The presence of a header window may also be used as an indicator that the lt f gt and lt b gt commands may be accessed The lt Esc gt and commands however may be used in any sub menu regardless of whether the sub menu contains a header window or not The main window contains the name of the routine at the top a brief description of the routine and any input prompts It may also contain a reminder of being able to use the lt g gt command to input data if applicable Input prompts are numbered and the cursor will usually appear at the end of the first prompt If any data besides input data is returned to the screen by the routine it w
31. l 9 pid lt Return gt at the Unix prompt where pid is the id number of the IAP process This command will terminate the process Be careful when using the kill command not to terminate the wrong process lt g gt The g command provides the user with an alternative to keyboard input This feature available in the majority of the analysis routines is used in conjunction with the Grinnell Display to input data to menu prompts In example assume the user is 8 prompted to enter the position angle of a desired point The user would then use the joystick control located at the Grinnell terminals to move the Grinnell cursor to the desired position angle on the image The Grinnell cursor consists of two intersecting lines crosshairs with the exact cursor position indicated by the point of intersection With the desired angle specified on the image the user hits the lt g gt command The position angle specified on the image is then automatically input to the menu prompt More information on lt g gt input is given in section 3 1 lt 4f gt lt 4b gt When using the Image Input Output option to specify which image files are to be worked on the user may specify more than one image Of course only one image file at a time may be worked on However the program keeps track of the other specified image files The lt f gt and lt b gt commands can then be used to move back and forth along this list so that the user
32. lename User types in a single filename of a previously created file containing a list of Markill image filenames The program will search for the file in the current directory unless the user includes a specific path along with the filename This option allows the user to compile a list of Marklll image filenames into one file and then use this file to input all the images at one time The creation of this file must be done outside the IAP program using an editor or other such source The file itself should contain one image filename per line and the filename may include a path The program will read through the file adding each filename to its internal list This internal list can then be accessed through the lt f gt lt b gt commands The first filename will automatically be loaded into memory and if a Grinnell is being used displayed on the Grinnell If the program should encounter any unreadable files it will simply display a short warning message and move on to the next file Unlike prompt number 1 successive use of this option will 24 delete any previously created internal list Therefore the user may not use this option to create an internal list of lists OUTPUT No output files are created through the use of this menu option NOTES The internal list described above is a crucial component of the IAP program Once this list is defined the user may use the lt f gt and lt b gt commands to move forward and
33. mes as there are image files to process If the user should need to stop the execution of a macro sequence lt c gt should be used The program will prompt the user for confirmation to end the program and set the execution number of the macro to zero Therefore the user can then respond negatively to the prompt and continue with the program The user is advised to try and hit the lt c gt command at the end of a display menu This is to try and minimize any problems with the screen being improperly displayed 43 APPENDIX 45 MARK II Integrated Analysis Package MAIN MENU 0 Exit Setup of Parameters and Options Image Input Output Line Scans Radial Scans Angle Scans Positional Information Line Lengths and Integration Area Determination and Integration mage Difference 10 Define Macro OOD AWN Select the number of the option desired Type if you need assistance IAP program main menu A 1 46 LINE SCAN Two sample line scans Note that data point size has been exaggerated for illustration purposes A 2 47 RADIAL SCAN IAP MARK Ill ANALYSIS Two sample radial scans Note that data point size has been exaggerated for illustration purposes 4 3 46 ANGLE SCAN 7 20 srqi IAP MARK III ANALYS Two sample angle scans Note that data point size has been exaggerated for illustration purposes A 4 49 50 REFERENCES Arch
34. n INPUT All boldface items located in parentheses are default values These values will be selected if nothing but a lt Return gt is issued at the prompt Initial Prompt Read SETUP from a file y n The user types y for yes n for no to indicate whether or not setup parameters should be read from a previously created file The file is initially created by responding positively to prompt number 11 in this menu See below If the user chooses to read from a file then the filename will be prompted for in the status window After the user types in a valid filename which may include a path the appropriate parameters will be set and the program will automatically exit to the main menu If the user chooses not to use a file setup then the program will proceed to the following prompts 1 Will the Grinnell be used y n User types y for yes n for no Indicates whether or not a Grinnell display is to be used to display images If user chooses not to use a Grinnell cursor skips to prompt number 6 2 If so which Grinnell 0 1 User types 0 if Grinnell O is being used or 1 if Grinnell 1 is being used 3 Which channel will be used for the image 1 3 User types 1 2 or 3 to select the Grinnell memory channel to be used in displaying the image As the IAP program currently stands there is no functional difference between any of the channels 4 Which channel will be used for overlay 8 11 User types 8 9 10 or 11 to select
35. nalysis routine which returns the length of a specified line in terms of solar radii Optionally the user may also have the routine return the intensity as integrated along the length of the line Operation KEYBOARD INPUT Initial Prompt Calculate integrated brightness y n User types y for yes n for no or lt Return gt for default of no to indicate whether or not the integrated brightness of the line should be calculated This prompt will only appear when first entering the menu option and will be located in the status window 1 Beginning solar radius User types in solar radius of first line endpoint Range 10 lt x lt 2 18 2 Beginning position angle User types in position angle of first line endpoint Range 0 0 lt x lt 360 0 3 Ending solar radius User types in solar radius of second line endpoint Range 1 0 lt x lt 2 18 4 Ending position angle User types in position angle of second line endpoint Range 0 0 lt x lt 360 0 34 lt g gt INPUT Prompt number where lt g gt is pressed 1 2 3 4 1 Beginning solar radius V K 2 Beginning position angle V V 3 Ending solar radius V K 4 Ending position angle V V V Value Returned K Keyboard Input N Not Applicable PROMPT CONSTRAINTS There are no constraints on prompt values besides the normal range for each prompt The following prompt values are valid 1 The beginning solar radius may be gre
36. not the integrated brightness of the area should be calculated This prompt will only appear when first entering the menu option and will be located in the status window 1 Beginning solar radius User types in solar radius of first arc of wedge Range 10 lt x lt 2 18 2 Beginning position angle User types in position angle of first radial side of wedge Range 0 0 lt x lt 360 0 3 Ending solar radius User types in solar radius of second arc of wedge Range 10 lt x lt 2 18 4 Ending position angle User types in position angle of second radial side of wedge Range 0 0 lt x lt 360 0 36 lt 4g gt INPUT Prompt number where lt g gt is pressed 1 2 3 4 1 Beginning solar radius V K 2 Beginning position angle V V 3 Ending solar radius V K 4 Ending position angle V vV V Value Returned K Keyboard Input N Not Applicable PROMPT CONSTRAINTS There are no constraints on prompt values besides the normal range for each prompt The following prompt values are valid 1 The beginning solar radius may be greater than or less than the ending solar radius 2 The beginning position angle may be greater than or less than the ending position angle OUTPUT Besides prompt values solar coordinates the area and if calculated integrated intensity will be output to the terminal screen for each area routine executed These values will be displayed in the main window unde
37. nt directory unless a path is specified 2 Second image filename User types in existing image filename or lt Return gt to default to currently loaded image The file will be searched for in the current directory unless a path is specified The image specified will be subtracted from the image specified in prompt number 1 3 Difference filename User types in new filename where the difference of the first two images should be placed The filename may be prefaced with a path This file may then be used as a normal image file OUTPUT Output consists of a new image file which is the result of the difference of two existing image files The filename of this new file is that specified in prompt number 3 The file will be located in the current directory unless a path is included along with the filename NOTES This is the sole analysis routine which the user may use before having specified an image file to work on This is because the user may wish to use the output file from this routine as the working image file An important feature of this routine is that the output image file is automatically added to the internal list described under section 3 4 Image Input Output The user may then use the lt f gt lt b gt commands to load the file If the file happens to be the first file in the internal list then it will be automatically loaded into memory and if a Grinnell is being used into the Grinnell display 39 If
38. ong the radius will be plotted The distance will be in terms of solar radii Any resultant graph is in accordance with the constraints and procedures described in section 3 1 NOTES The user should note that regardless of the relative values of the beginning and ending solar radii the scan will always be produced from the innermost radius to the outermost radius The outermost point of the specified radial line may or may not be included in the scan depending on whether or not there are an integral number of delta units contained within the length of the line 29 3 7 Angle Scans Function An analysis routine which obtains the intensity of the image as a function of position along an arbitrary arc held at a constant solar radius Operation KEYBOARD INPUT To define an arc the user must specify the beginning and ending position angles of the arc endpoints and a solar radius at which the arc will be drawn 1 Solar radius User types in solar radius at which arc will be drawn Range 1 0 lt x lt 2 18 2 Beginning position angle User types in position angle of first arc endpoint Range 0 0 lt x lt 360 0 3 Ending position angle User types in position angle of second arc endpoint Range 0 0 lt x lt 360 0 4 Delta distance User types in value for distance between each data point along the arc This value will be in terms of degrees The intensity of the image will be calculated at each of these data points
39. onjunction with chapter 3 to provide the user with a better understanding of program operation In the interest of clarity and brevity the following conventions have been adopted in writing this manual Each term listed is accompanied by the action or item which it represents lt Return gt Depress the return key or other valid carriage return lt Esc gt Depress the escape key lt char gt Hold down the control key while pressing the char key two key rollover ie lt c gt lt f gt lt Delete gt Depress the delete key lt Space gt Depress the space bar Represents Unix command prompt To separate user input from manual text all user input shall be printed in boldface Also since the majority of the input will be numerical in nature the user need only worry about upper and lower case distinctions when typing in filenames Chapter 2 IAP BASICS 2 1 Getting Started A general outline of IAP program execution is given below The rest of this chapter will build upon this outline and fill in missing details Accessing IAP Program Allocation of Grinnell Display optional Starting IAP Program Running AP Program Exiting IAP Program Deallocation of Grinnell Display optional nmo A Accessing IAP Program It is assumed that the user has logged on to the system and has access to the IAP executable code This code named IAP is located in the following directory u henick menu dir B
40. point Range 10 lt x lt 2 18 lt g gt INPUT Prompt number where lt g gt is pressed 1 2 1 Position angle I V KIN 2 Solar radius V K N V Value Returned K Keyboard Input N Not Applicable Acknowledging that this table may be somewhat confusing the values indicate that lt g gt may only be used at prompt number 1 and in doing so returns values for both prompts Consequentially the only other option for entering information is to type in responses to both prompts 32 PROMPT CONSTRAINTS There are no constraints on prompt values besides the normal range for each prompt OUTPUT Besides prompt values solar coordinates Grinnell coordinates and pixel intensity will be output to the terminal screen for each positionai routine executed These values will be displayed in the main window under the prompts If reports have been specified in the Setup option a file named imagefilename pos will be produced where imagefilename is the current image file being worked on This report file will be located in the same directory as the image file The file will contain Grinnell x y coordinates solar coordinates and pixel intensity for each data point analyzed written in table form If more than one positional routine is performed the successive data point information will simply be appended to the file and separated from other scans by a header line 33 3 9 Line Lengths and Integration Function An a
41. r the prompts If reports have been specified in the Setup option a file named imagefilename area will be produced where imagefilename is the current image file being worked on This report file will be located in the same directory as the image file The file will contain Grinnell x y coordinates and solar coordinates of the corner points of the wedge area in terms of solar radii squared and centimeters squared and if calculated the integrated intensity of the area This data will be written in table form If more than one area routine is performed the successive area information will simply be appended to the file and separated from other scans by a header line NOTES The user should note that regardless of the relative values of the beginning and ending position angles the wedge will always be defined counterclockwise from the specified beginning position angle In this way the user is allowed to specify an ending angle 37 which is smaller than the beginning angle as is the case when defining a wedge which crosses the position angle of 0 degrees 38 3 11 Image Difference Function An analysis routine which takes the difference between two existing image files The resultant difference file may then be used as any other image file might be Operation INPUT 1 First image filename User types in existing image filename or lt Return gt to default to currently loaded image The file will be searched for in the curre
42. r types y for yes n for no to specify whether report files should be produced These report files allow the user to record results from each analysis routine to a file Each analysis routine with the exception of image difference is associated with a distinct report filename This filename is derived by adding the image filename to a distinct suffix For example a radial scan performed on the image 17 20 srq would produce a report file named 17 20 srq rad This file would be produced in the directory where the image file is located As each scan is completed the results are simply appended to the report file Therefore multiple scans may be recorded without having to specify a filename for each scan Multiple scan results within the same analysis routine are kept separate by a header line placed at the beginning of each set of scan results The results recorded in the report files vary from routine to routine but in general the following items are included for each scan data point Grinnell x and y coordinates actual image coordinates in terms of degrees and solar radii and intensity values Refer to specific analysis routine sections for more information on report contents and filenames 10 How are intensities to be displayed n earest pixel or w eighted pixel User types n for nearest pixel calculation or w for weighted pixel calculation This option allows the user to specify how the intensity for a particular data point will be calc
43. rned unless the system is unable to allocate the Grinnell Display specified In that case it is most likely that someone has previously allocated the Grinnell Display and is still using it or has forgotten to deallocate the device If someone has forgotten to deallocate the device and the second Grinnell Display is not available the user may wish to refer to the greef program This command will deallocate the Grinnell display and send an appropriate message to the person who left the Grinnell allocated The user may also wish to refer to the grtime program which provides a weekly schedule and signup sheet for Grinnell use Users should include usr local in their pathnames login file to access gall greef grtime and the degall command mentioned below C Starting IAP Program Before starting the IAP program the user should be sure that the settings are correct for the particular terminal being used Otherwise the IAP menus will not be properly displayed on the terminal screen Normally this is taken care of automatically by commands found in the user s login file Otherwise the user may use the Unix set term vt100 command to set the correct terminal characteristics To start the IAP program input the following iap lt Return gt After a few seconds the IAP main menu should appear on the terminal screen see APPENDIX A 1 If the main menu screen is not properly displayed on the terminal simply hit the lt Esc gt key
44. rtains to each sub menu The items discussed are broken down into the following topics A Image Data Information B Sub menu_ Information C User s manual sub menu format A Image Data Figure 3 1a illustrates a Marklll image file as displayed on a Grinnell Display This illustration is useful in describing certain properties and conventions as apply to image files First note that any image point may be described in either Grinnell coordinates or solar coordinates Grinnell coordinates are comprised of a 512 x 512 X Y plane with the origin lying at the lower left hand corner of the display For reference the exact center of a Marklll image lies at coordinate 263 5 263 5 Solar coordinates are described by a solar radius and a position angle Marklill image data lies between 1 0 and 2 18 solar radii and 0 to 360 degrees Note that the actual inner radius of the image tends to vary from image to image due to characteristics found in the data recording instrument It is important to note that the position angle is defined with 0 degrees at the top of the image or North cardinal point The angle increases counterclockwise from this point The user should also note the respective positions of the East and West cardinal points The image filename is located at the lower left hand corner of the display and a vertical color bar is provided in the upper left hand area of the display The color bar displays a color with respect to the intens
45. s using prompt 1 25 3 5 Line Scans Function An analysis routine which obtains the intensity of the image as a function of position along an arbitrary straight line Operation KEYBOARD INPUT 1 Beginning solar radius User types in solar radius of first line endpoint Range 10 lt x lt 2 18 2 Beginning position angle User types in position angle of first line endpoint Range 0 0 lt x lt 360 0 3 Ending solar radius User types in solar radius of second line endpoint Range 10 lt x lt 2 18 4 Ending position angle User types in position angle of second line endpoint Range 0 0 lt x lt 360 0 5 Delta distance User types in value for distance between each data point along the line This value will be in terms of solar radii The intensity of the image will be calculated at each of these data points Range 0 0 lt x lt 2 0 lt g gt INPUT Prompt number where lt g gt is pressed 1 2 3 4 5 1 Beginning solar radius V K 2 Beginning position angle V V 3 Ending solar radius V K 4 Ending position angle V V 5 Delta distance l K K K K N V Value Returned K Keyboard Input N Not Applicable 26 PROMPT CONSTRAINTS In keeping with the function specification of an arbitrary line there are no constraints on the prompt values besides the normal range for each prompt The following prompt values are valid 1 The beginning solar radius may be gr
46. t key was pressed the program exits to the main menu as expected 3 The user moves to the Setup menu for the first time and sets all the appropriate parameters through prompt number 12 At this time the cursor will move back to prompt number 1 and the following message will be displayed in the status window Use lt Return gt to retain current value All SETUP values defined lt Esc gt when finished The user may now using the lt Return gt key move through the list of options as many times as needed and edit any previously input values Note that the cursor moves back to prompt number 1 not the initial prompt To get back to the initial prompt Read SETUP from a file the user must lt Esc gt out of the Setup menu and then reselect the Setup menu When all parameters are set correctly the user simply hits the lt Esc gt key to implement the options and move back to the main menu 4 The user moves to the Setup menu at some point during program execution after having used the Setup menu at least once before The menu no longer displays default values in boldface The same status message displayed in situation 3 is displayed once again Current values for the parameters will be those defined the previous time the menu was used That is the reason no default values are highlighted When the lt Return gt key is pressed at an option the current value will be typed next to the prompt To see all of the current values t
47. ulated The two methods affect the exact location which will be used to determine the intensity If the user specifies nearest pixel intensities then the intensity of the pixel closest to the data point is used If weighted intensities are used then the intensities of the four nearest pixels are weighted according to their distance from the desired data point The summation of these weighted intensities is then used as the final intensity value 11 Should these parameters be saved for future use y n User types y for yes n for no to specify whether or not the responses to the prompts found in this menu should be saved to a file By saving these responses the user may quickly setup the program in future uses of the program The program will not prompt for a filename unti the lt Esc gt key has been pressed to exit from 21 this menu At that time the user may type in any valid Unix filename including a path if so desired The user may then use this file on future occasions or perhaps within the same running of the program to quickly initialize the setup parameters This is accomplished through the initial prompt which is described above It should be noted that when the file is created it is written in binary format However an ascii file is also created so that the user may directly read the file This file simply contains the responses to the various prompts in this menu The filename for this ascii file will be composed of the or
48. uleta S and R Beutner JAP MarkIII K Coronameter Integrated Analysis Pack age Maintenance Manual July 1988 Chalmers J W A User s Guide for the MK II K Coronameter Data System March 1985 NCAR Technical Note NCAR TN 247 IA 51
49. used to keep the user apprised of what the program is doing This is especially useful when there is no noticeable activity on the terminal screen For instance the program might display a message that it was working on creating a report file In some cases the status window may also contain an initial prompt which must be answered before moving on to the regular prompts The user should also be aware of one other status window feature If a program error should occur an error message may be returned by the program in the status window The format of the message is as follows error message procedure where error occurred if the user can recall this information it will be much easier for the 13 person debugging the program to find the problem Of course the user should also try to remember what was being done when the program error occurred C User s manual sub menu format The method of describing specific details for each sub menu is accomplished by dividing the routine into four parts function input output and notes If the lt g gt command can be used then the input section is divided into keyboard input and lt g gt input Prompt constraints as explained below are also included where appropriate The function section simply describes what the routine is to be used for Keyboard input describes prompt by prompt what the user is to type in Besides the description a range of appropriate values is also listed
50. way for the user to use lt g gt at the second prompt is if the user types in the input to the first prompt from the keyboard Now moving on to the next value in the column the V indicates that a value is returned for the Beginning position angle prompt as expected As before the only other definite condition about the rest of the prompts is that the keyboard must be used for input to the Delta distance prompt The third column represents those conditions which are true or definite when lt g gt is used at the third prompt Ending solar radius The two beginning dashes indicate that nothing definite can be said about the first or second prompts with regard to using lt g gt at the third prompt The first V in the column indicates that a value is returned for the Ending solar radius prompt The 15 following V indicates that a value is also returned for the Ending position angle prompt The K indicates again that the Delta distance input must be typed in from the keyboard These conditions are analogous to using lt g gt at the first prompt The fourth column represents those conditions which are true or definite when lt g gt is used at the fourth prompt Ending position angle These conditions are analogous to those for the second prompt Nothing definite can be said about the first two prompts The user must use the keyboard to input data to the Ending solar radius prompt As e
51. xpected a value is returned for the Ending position angle prompt and as before the Delta distance input must be typed in from the keyboard The fifth column represents those conditions which are true or definite when lt g gt is used at the fifth prompt Delta distance It has been noted in the previous prompt conditions that the Delta distance input must be typed in from the keyboard Therefore it should be no surprise that the user is not allowed to use the lt g gt command at this prompt The K N value in the column indicates that the keyboard must be used to fill in the delta distance and that the lt g gt command is not applicable to this prompt Hopefully the user now has a good idea of how the table is used The user should also be aware that although the input has been separated into keyboard and lt g gt input the two are not mutually exclusive In fact a good way to see all the possible combinations of the two types of input is to substitute all the dashes ina lt g gt table with a K The last item of discussion regards the output of graphs Depending on whether they have been specified in the Setup of Parameters and Options menu data graphs may be produced for Line Radial and Angle scans In general these graphs will represent a plot of image intensity versus data position The following information is relevant to any graph produced and is therefore included in this section rather than
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