Plan Area Index Calculator
Contents
1. png gif tif or pgm 2 STEP 2 Set scale In order to compute the scale of the image two points has to be specified red and black crosses in the figure below where the real world distance in known Click on the Set scale and move your mouse pointer over the image It will turn to a cross and now you can click on two separate locations on the circumference After this a pop up window will apper where you have to specify the distance between the points in meters MainGUI_PAI lolx File Help PLAN T INDEX CALCULATOR STEP 1 STEP 2 STEP 3 STEP 4 STEP me gt E Classify map gt Setsensor gt Calculate PAI T Output to textfile a from value Radius of PAI CT Mutiple PAI on the same map in each color band 0 123 o circle meters 100 Nyg rden Plan Area Index as SVF Holmer et al 2001 Plan Area Index Plane 3 STEP 3 Classify Map Land use classes used in the PAI calculation has to be identified and separated Click on the Classify map and start the identification You will be presented with the following pop up window i5 x Land use class indentification for PAI calculation Undo Kdentify Continue By choosing Identify you will be able to click on the land use class that you want to include in your PAI calculation Once you have clicked the land use class will turn black and you will be presented with the same pop up window again You can Undo the last iden2. G teborg Urban Climate Group University of Gothenburg Department of Earth Sciences Plan Area Index Calculator User Manual Version 1 1 Date 2011 11 10 Fredrik Lindberg Bjorn Holmer University of Gothenburg contact Fredrik lindberg gvc gu se Introduction This manual describes how to install and make use of the PlanArealndexCalculator that is able to compute the Plan Area Index PAI within a user specified circle on an unreferenced images and maps using a Graphical User interface GUI This application is free to use Version history V1 1 Option to set a color tolerance for aerial photos and other images Released 2011 11 11 V1 0 First version Released 2011 10 20 Installation This model is written in MATLAB computing language and is executed using the MATLAB Compiler Runtime MCR which can be distributed royalty free Hence the user can run the model without having a MATLAB license or any skills in MATLAB programming The MCR runs on WINDOWS NT 2000 XP Vista7 platforms To be able to run the model the MCR must be installed locally on the computer that will be used The MCR and the SVF calculator can be downloaded from http www gvc gu se Forskning klimat stadsklimat gucg software Running the model To run the model the user simply needs to double click on the PlanArealndexCalculator exe The GUI is divided into five sequential steps 1 STEP 1 Loading image File formats possible for image files are jpg
3. eighting technique used for sky view factor calculations as described in Holmer el al 2001 And ii as a regular plane PAI Additional settings There are currently three additional settings that could be made 1 Output to textfile An option where the results is written to a text file is also available 2 Multiple PAI on the same map An option to process more than one image from the same classification and scale 3 Tolerance from value in each color band 0 123 This option make it possible to also set land use classes similar to the point chosen in Step 3 The value specified in the box will add a tolerance above and below the chosen RGB value For example if a 100 100 100 value is chosen and a tolerance of 5 is set all pixels with the RGB value of 95 105 95 105 95 105 is chosen References B Holmer U Postgard and M Eriksson 2001 Sky view factors in forest canopies calculated with IDRISI Theoretical and Applied Climatology 68 33 40 Johnson G Watson 1984 The Determination of View Factors in Urban Canyons Journal of Climate and Applied Meteorology 23 329 335
4. tification if needed Continue the procedure until all your PAI land use classes ate identified iol x File Help z PLAN AREA INDEX CALCULATOR STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 Load map gt Set scale gt Classify map gt Setsensor position gt alculate I7 Output to textfil Tolerance from value Radius of PAI ee e E in each color band 0 123 o circle meters 100 T Mutliple PAI on the same map yg rden Skalbe eg Plan Area Index as SVF Holmer et al 2001 Plan Area Index Plane STEP 4 Set sensor position This step defines the area of which PAI will be calculated Click on set sensor position and you will be able to click on the image specifying the center point of a circle The radius of the circle is decided based on the scale set step 2 and the Radius of PAI circle meters to the right above the image of the GUI MainGUI_PAI lei x File Help PLAN AREA INDEX CALCULATOR STEP 1 STEP 2 STEP 3 STEP 4 STEP Load map gt Set scale gt Classify map gt suseso esto gt Calculate PAI I Output to textfile Tolerance from value Radius of PAI aan j Al seve cans in each color band 0 123 o circle meters 100 Plan Area Index as SYF Holmer et al 2001 Plan Area Index Plane 5 STEP 5 Calculate PAI Click on the Calculate PAI button and the PAI values will appear below the image calculated by two different methods i one where the same wh
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