KMZFactory v1.11 User Manual
Contents
1. v Places amp myer en GJ Sig aces A N Great Portland Street e7 Ea Ci ans gt My wire S AN AY A F s OS N amp lmage ty ra Se YA ANTA wien at en J Re RA D 636 im ot 4 S wh 7 T xA x N N ho z n R Ti Q pE oe ep ell a N R He An R b TY 4 piae EN r f s ari gt Imagery Date 6 27 2010 gp 1945 1 31 50 35 N 030917 120W elev 31m gt Layers Earth Gallery gt Step 5 Save the geo referenced image as a kmz file In the Places panel of the Google Earth window right click on the name of the overlay Regent s Park in this example and select Save Place As Save the overlay as a kmz file and select a name and location for the saved file Appendix A Geo referencing an image with Google Earth A 3 KMZFactory v1 11 User Manual a July 2014 Very large image overlays may not appear in Google Earth You may find that an image will not display in Google Earth There is a size limitation to Image Overlays in Google Earth This depends on the graphics card on your PC You can find this limit from the About Google Earth item on the Google Earth Help menu About Google Earth 2f x Google earth Google Earth 6 1 0 5001 Build Date 10 17 2011 Build Time 10 38 49 am Renderer DirectX 9 Operating System Microsoft Windows 6 1 7601 1 Video Driver 0000 10DE 00008 00017 00012 07536 Max Texture Siz2. _ e a S Cropping y m A w oon A mm Bottom 400 width 3320 Height 3815 A Par i I ns Ps By dae yu d Regent s SP riage ec Cancel Accept a aN Bt ot 5 4 x te EA Ory pake x atan Lng Ken ore 4 gi T sm Bs ee ste a a oo Pang n a bs post k ka 2 da E tA D Ps J ws 3 T ANS P x Permalink Shortlink A ma Ole a ot a Here the crop window has been set to 1 000 pixels from the left and right edges and 400 pixels from the top and bottom edges of the image so that the body of the park has been isolated The cropped width and height are now 3320 x 3815 pixels The cropped region is delimited by the black and white dashed rectangle on the image You can zoom in and zoom out of the image using the plus and minus keys and if you are zoomed in you can pan around by using the cursor arrow keys up down left and right Holding down the Shift key as well makes moving faster You can set a crop value directly by typing a value in the appropriate box or you can click on the and buttons on either side in which case holding down the Shift key as well moves the crop border faster When you are happy with the cropped region click on Accept to return to the main KMZFactory dialog or click on Cancel if you decide not to apply these cropping boundaries 10 KMZFactory v1 11 User Manual July 2014 Tiling parameters You may specify
3. KMZFactory v1 11 User Manual John Romaya July 2014 KMZFactory v1 10 User Manual 2o July 2014 Table of Contents Why use KMZFactory The KMZFactory dialog Opening a map file Source file information Revert button Draw Order Geo referencing parameters Cropping Tiling parameters Output options Map projection Large image files Building a map image library Appendix A Geo referencing an image with Google Earth Very large image overlays may not appear in Google Earth Appendix B Mercator projection correction Appendix C Deleting unnecessary tiles with Google Earth KMZFactory v1 10 User Manual July 2014 Sourcecode Acknowledgements KMZFactory was developed with the aid of the following software 1 The Independent JPEG Group s JPEG software http www 1jg org 2 The libtiff software package by Sam Leffer and others http www remotesensing org libtiff 3 zip unzip by Lucian Wischik a repackaged form of the zlib code by Jean Loup Gailly and Mark Adler and others http www codeproject com useritems zip_utils asp http www gzip org zlib Commercial Credits Google Earth is a service provided by Google Inc Google located at 1600 Amphitheatre Parkway Mountain View CA 94043 United States Garmin International 1200 E 151st Street Olathe KS 66062 3426 United States OpenStreetMap http www openstreetmap org provides map data OpenStreetMap contributors CC BY SA
4. MS teeland_o101 i M Iceland_0102 WS teeland_o103 ME teeland_0104 vl Iceland_0105 M teeland_o201 WS Ieeland_o202 Appendix C Removing unnecessary tiles with Google Earth C 1 KMZFactory v1 11 User Manual igs July 2014 Individual tiles may be identified by deselecting their tick mark to make them invisible Here three tiles have been deselected which just show the ocean Goosle Earth File Edit View Tools Add Help gt Search y Places eOe My Places tOe Sightseeing Tour Make sure 3D Buildings AOA Temporary Places 5 Ee Iceland l Me Iceland_0101 s Me Iceland_0102 2 Me Iceland_0103 WS iceland_0104 M amp S teeland_o105 MS Iceland_o201 WS teeland_o202 WS teeland_o203 F Me Iceland_0204 WS Iceland_o205 z Me Iceland_0301 M teeland_o302 o M teeland_0303 MS teeland_o304 j Me Iceland_0305 D Ieeland_o4o1 F Me Iceland_0402 j Me Iceland_0403 MS teeland_o404 WS tceland_o405 D teeland_os01 WS iceland 0502 WS iceland_os03 WS teeland_o504 lt 1 tceland_o505 Gale gt Layer Earth Gallery gt Once they have been identified in this way the individual tiles can be deleted by right clicking on each tile and selecting Delete 65 05 04 11 N pD elsa el a E U S Navy NGA GEBCO 35 Spot Image crm ee ee Geological Survey ww L Image U 19 09 28 66 W elev 532m MS ieeland_oz05 MS teeland_
5. 0 1719023277 Geo referencing _ Latitude Longitude box Centre co ordinates and scaling pixels kilometre North 51 5394063969 East 0 1394591 449 South 51 521 7896384 West 0 1719023277 Units DECIMAL Rotate 0 0000000000 at 51 53059801 76 Ean 0 1556807363 Scaling pixels kilometre PAR 0 9964295934 Y 2354 5766205415 s 2363 0135397792 Enable cropping Cropping op Tiles Source pix Dest pix Dest num Horizontal gt lt 88 Vertical r 4615 923 Total H Image Tag Regents Park Output options Projection MERCATOR Draw Order 20 JPG quality 80 sessseresesssssessssssssssssssssssesesssesssesaSad Create KMZ File It is divided into five functional panels Source file Geo referencing Cropping Tiles Output options This shows information about the current source map including the name and location of the map image image size in pixels and geo referencing data This panel allows editing of the geo referencing data which precisely locates the map image on the surface of the Earth The operator may use the fields in this panel to modify the geo referencing data that was in the source file or if the source file was a simple image the data can be entered here from scratch Here you can optionally select a sub rectangle of the source imag
6. but it may take some time anything up to one minute to process large images If you encounter an out of memory error KMZFactory x KMZFactory 1 11 Crop window Unable to allocate memory for image you should try closing down any other programs running on your PC and if that fails you should reboot your PC and try again directly with KMZFactory before running any other programs KMZFactory has the following absolute image size limits depending on the amount of memory you have on your PC Anything over 4Gb RAM 30 000 x 30 000 pixels Anything over 3Gb RAM 25 000 x 25 000 pixels Anything over 2Gb RAM 20 000 x 20 000 pixels Anything over 1Gb RAM 15 000 x 15 000 pixels 14 KMZFactory v1 11 User Manual July 2014 Building a map image library The kmz files created by KMZFactory are convenient for uploading to a GPS device because they contain all the geo referencing data as well as all the individual map tile images in a single file But if you have a lot of large source map images each of which you want to crop and use to make several kmz files it is more efficient to use a kml file to geo reference each master map image A kml file is actually a text file which contains geo referencing data as well as a reference to the image file name without containing the image itself If you use a kml file to geo reference your image you can still access the image directly because it exists as a separate file and you can
7. 521 7896384 East 0 1394591 449 Wed 01719023277 This is the same method that is used by Google Earth The locations of the top and bottom edges of the image are specified using the North and South latitude values and the right and left edges of the image are specified by the East and West longitude values respectively The two items below Units and Rotate apply to all types of geo referencing data Units DECIMAL Rotate 0 0000000000 Units You may display Latitude and Longitude values either in decimal notation or as degrees minutes and seconds in which case the values are separated by colons North 51 5394063963 North 51 32 21 86302879 East 0 1394591 443 E ast 0 10 18 8483797 Units x DECIMAL Units x DEG MIN SEC KMZFactory v1 11 User Manual a July 2014 Latitude is expressed in degrees north or south of the Equator which is latitude 0 A positive value denotes a northerly latitude and a negative value denotes a southerly latitude In a similar way a positive longitude denotes a point East of the Greenwich Meridian while a negative value indicates a westerly longitude Rotate Specify a rotation of the image as a value between 180 and 180 degrees Positive values denote an anti clockwise rotation and negative values cause a clockwise rotation Centre co ordinates and scaling Centre co ordinates and scaling metres pixel Lat 91 53059801 76 y 0 4247045031 Lon 0 1
8. Google Earth imagery If you select the Location tab of the New Image Overlay dislog box you will see the co ordinates which define the North South East and West geo referencing of the image If you wish you may also set the Draw Order of the Overlay a number between 0 and 100 which determines how Overlays appear when they overlap The Draw Order value appears on the Altitude tab Appendix A Geo referencing an image with Google Earth A 2 KMZFactory v1 11 User Manual July 2014 Step 4 Geo reference the image Adjust georeference the JPEG so it matches the satellite imagery beneath the image overlay Move the green marks to adjust the corners edges center or rotation of the JPEG If you hold down the Shift key while adjusting one of the corners the image will maintain its aspect ratio as you resize it The image can be scrolled around by moving the central cross or you can rotate it by mving the green diamond shape You may need to adjust the transparency of the JPEG so the satellite imagery can be seen beneath the JPEG Use the Transparency bar near the top of the Image Overlay window to adjust the transparency When the map image is correctly georeferenced click the OK button on the Image Overlay window and the image should be present in the Places panel of the Google Earth window Google Earth vy Search Fly To _Find Businesses Directions Fly to e g 1600 Pennsylvania Ave 2000 we
9. Help Add Cut Copy Delete Delete Contents Gale Aw gt Layer Earth Gallery gt Rename Revert Save to My Places Share Post Email Snapshot view Sort Z Properties Navy NGA GEBCO 35 Spot image Survey Google eartr 65 05 04 11 N 19 09 28 66 W elev 532m Eye alt 573 49 km Appendix C Removing unnecessary tiles with Google Earth
10. also edit the kml file as a standard text file If on the other hand you create a kmz file it will be much larger because it contains a copy of the original image as well as the geo referencing data But in the case of a kmz file the copy of the original image contained within it is not directly accessible You can make a kml file from Google Earth If you have loaded an Overlay Image you can then save it as a kml file see Appendix A Geo referencing an image with Google Earth Step 5 Two files will be created a copy of the Overlay Image and a kml file which contains the geo referencing data in plain text You will probably want to delete the superfluous copy of the Overlay Image You can edit a kml file by right clicking on the file and selecting Open with and then choosing a text editor like Wordpad for example Here is a typical kml file lt xml version 1 0 encoding UTF 8 gt lt kml xmilns http www opengis net km1 2 2 xmins gx http www google com kml ext 2 2 xmins kml http www opengis net km1 2 2 xmilns atom http www w3 org 2005 Atom gt lt GroundOverlay gt lt name gt Regents Park lt name gt lt lcon gt lt hre f gt RegentsPark jpg lt hre E gt lt viewBoundScale gt 0 75 lt viewBoundScale gt lt Icon gt lt LatLOnBOR gt lt north gt 51 53940639688562 lt north gt lt south gt 51 52178963840426 lt south gt lt east gt 0 1394591449124616 lt east gt lt west gt 0 1719023
11. is limited and so it makes sense to be as thrifty as possible when constructing them When you first open a source file KMZFactory assumes you want to use the whole image so the Cropping panel is initially disabled Cropping AREER EERE TEESE EEE E EERE EERE EEE ES If you click on the Enable cropping checkbox you open the full panel Cropping lt Iv Enable cropping Left indent 0 Top indent 0 Crop window Right indent 0 Bottom indent 0 Cropped width 59320 Cropped height 4615 You can specify a cropping indent in pixels for the left top right and bottom of the image The width and height of the cropped image are also shown and may be edited in the above example the image has not been cropped and so the cropped width and height 5 320 x 4 615 pixels reflect the full size of the original image Cropping an image in this way is unsatisfactory because it is not clear from these indent numbers what the result of the cropping is when it is applied to the source image For this reason a graphical interface has been added so that you can see exactly where the cropping will occur You can access this interface by clicking on the Crop window button KMZFactory v1 11 User Manual July 2014 M kMZFactory Crop window x Moving around Use Plus and Minus keys to zoom in and out Use the cursor arrows to move around Holding down the shift key makes moving faster
12. only includes characters A Z a z and 0 9 and does not include any special characters like spaces or underscores The resulting KMZ map and all the tiles it contains will be renamed according to the filename you type when you save your final KMZ file regardless of the name of the original source image If you choose a non standard filename you will see a warning message but the file will still be created Once a KMZ file has been successfully created KMZFactory remembers the folder where it was located and will save files in that same folder the next time you want to create anew KMZ file 12 KMZFactory v1 11 User Manual 2o July 2014 Map projection The surface of the earth is a slightly flattened sphere while maps are two dimensional images so any flat map of the earth is a projection of the curved surface of the earth onto a flat image KMZFactory has no way of knowing what type of map projection is used in the source file you provide so you must specify it in the Map projection selection box in the Output options panel in the lower section of the KMZFactory interface KM7ZFactory can deal with the following types of map projection Equi rectangular In an equi rectangular map projection the Earth s horizontal lines of latitude form the horizontal lines of the grid of the map and the curving lines of longitude of the Earth are straightened out to form the vertical lines of the grid of the map This is the type of projection
13. remove unnecessary tiles in some cases Consider the following map of Iceland which has 5 x 5 tiles Google Earth File Edit view Tools Add Help asear O arse ela a B ele y Places i My Places amp C Sightseeing Tour Make sure 3D Buildings G MS Temporary Places aS Iceland gt ME tceland_o101 MS iceland 0102 Me Iceland_0103 M Ieeland_o104 o M amp S Ieeland_o105 MS teeland_0201 Me Iceland_0202 WS tceland_0203 Me Iceland_0204 MS Iceland_o205 Me Iceland_0301 VIS Iceland_0302 o M amp S tceland_0303 M amp S Iceland_0304 VIS Iceland_0305 MS teeland_o401 ME teeland_o402 WS teeland_o403 Mes Iceland_0404 WS teeland_o405 o WS teeland_o501 M amp S Iceland_oso2 o AS teeland_0503 WS Ieeland_o504 M amp Iceland_osos Data SIO NOAA U S Navy NGA GEBCO 2012 Spot TEE Gla ll a o lssi Image U 3 Eeo ogical Survey Google eartr 1 gt Layer Earth Gallery gt 65 05 04 11 N 19 09 28 66 W elev 532m Eye alt 573 49 km The map has been opened in Google Earth from the File Open menu item and the 25 individual map tiles have been expanded in the Places pane by clicking on the symbol vw Places y Places a O amp My Places O amp My Places i CE Sightseeing Tour B CO Sightseeing Tour Make sure 3D Make sure 3D Buildings Buildings e MS Temporary Places a MS Temporary Places E ME iceland v S Iceland
14. 0301 Mea Iceland_0302 i M Iceland _0303 MS Iceland 0304 j M Iceland _0305 D Ieeland_o4o1 SS Iceland_0402 j Me Iceland_0403 ME Ieeland_o404 M Ieeland_o405 i Eg Iceland_0501 MS iceland 0502 MS iceland_0503 Mg Iceland_0504 7 le Iceland_0505 Qale l gt Layer Earth Gallery gt Google eartr Eye alt 573 49 km Delete Refresh Rename Save to My Places Save Place s Share Post Email Snapshot View Properties Appendix C Removing unnecessary tiles with Google Earth C2 KMZFactory v1 11 User Manual igs July 2014 After all three unnecessary ocean only tiles have been deleted the modified overlay should be saved from Google Earth by right clicking the main overlay in the Places panel and selecting Save Place As Goosle Earth File Edit wiew Tools gt Search y Places e 0 My Places W CIE Sightseeing Tour Make sure 3D Buildings Temporary Places M6 Iceland MS teeland_o102 M amp S Ieeland_o103 WS teeland_o104 M amp S teeland_0105 MS Ieeland_o2z01 M amp S teeland_o202 MS teeland_0203 M amp S teeland_o204 MS teeland_o205 M amp S teeland_o301 MS teeland_0302 o MS tceland_0303 o M amp S teeland_o304 M S Iceland_0305 o MIS tceland_oqoz M amp S tceland_o403 MIS Iceland_o404 M amp S teland_o405 MS teeland_o502 o MS teeland_0503 M amp S tceland_os04 ME teeland_0101 Add
15. 277407772 lt west gt lt LatLonBox gt lt GroundOverlay gt lt kml1 gt The image file name RegentsPark jpg has been highlighted in the above example You may wish to edit the filename so that you can keep all your map images in a convenient location So for example you could change the filename to Images RegentsPark jpg You can use kml files in this way to organize your collection of map images and still have them in a geo referenced form which can be readily accesssed by KMZFactory 15 KMZFactory v1 11 User Manual July 2014 You may include several overlay images in a single kml file This way you can have a single kml file which contains georeferencing data for many images You can then select a particular image to work on when you open the kml file with KMZFactory If you choose to do this each of the consecutive lt GroundOverlay gt lt GroundOverlay gt sections should be enclosed by a single lt Folder gt lt Folder gt section as shown in the example below lt xml version 1 0 encoding UTEF 8 gt lt kml xmilns http www opengis net km1 2 2 xmins gx http www google com kml ext 2 2 xmins kml http www opengis net km1 2 2 xmilns atom http www w3 org 2005 Atom gt lt GroundOverlay gt lt name gt Regents Park lt name gt lt Icon gt lt href gt RegentsPark jpg lt href gt lt viewBoundScale gt 0 75 lt viewBoundScale gt lt 1con gt lt LatLonBox gt lt north gt 51 5394063968
16. 556807363 se 0 4231884342 Scaling a metres pixel PAR 0 9964295934 Alternatively you can also specify the precise Latitude and Longitude of the exact centre of the image together with the scaling factor of the image in metres per pixel which is specified separately for the width X and height Y of the image The PAR value gives the Pixel Aspect Ratio of the image If you want to display the image in true scale i e so that the map is not compressed either vertically or horizontally you may need to stretch or compress each pixel horizontally The PAR then gives the ratio of the horizontal length of each pixel divided by the vertical You may prefer to specify the scaling factor as pixels kilometre rather than metres pixel and you can select either method using the Scaling drop down list Centre co ordinates and scaling pixels kilometre Lat 51 53059801 76 Y 2354 5766207929 Lon 0 1556807363 s 2363 01 35400331 When you change the scaling from metres pixel to pixels kilometer or vice versa the X and Y scaling values are converted appropriately but the PAR is unaffected KM7ZFactory remembers your preferred setting when you quit KMZFactory v1 11 User Manual a July 2014 Cropping You may not need to use the complete source file For example you may have a master image of an area which is very large and you may just need a small part of the large map The number of tiles in a Custom Map
17. 8562 lt north gt lt sourch gt 51 52178963840426 lt south gt lt east gt 0 1394591449124616 lt east gt lt west gt 0 1719023277407772 lt west gt lt LatLonBox gt lt GroundOverlay gt lt GroundOverlay gt lt name gt Iceland lt name gt lt Icon gt lt href gt Iceland jpg lt href gt lt viewBoundScale gt 0 75 lt viewBoundScale gt lt I ICom lt LatLonBox gt lt north gt 54 49468528701576 lt north gt lt south gt 54 21968836422165 lt south gt lt east gt 1 685179344515426 lt east gt lt west gt 2 157268374672597 lt west gt lt LatLonBox gt lt GroundOverlay gt lt kml gt 16 KMZFactory v1 11 User Manual July 2014 Appendix A Geo referencing an image with Google Earth Step 1 Digitize the image First of all you need to digitize the map you want to use The map should either be in the public domain or be free of copyright or you should have the permission of the copyright owner to use the map For this example we will be using an image of Regent s Park London from OpenStreetMap http www openstreetmap org The map should be saved as a digital image for example as a jpg image or a _ oe Wa eee eee lossless format such as tiff Loe ge SSG irre Sh Waa UR a ae NG F Ag a jae y ih SFA 4 es 2 Permalink Sthortlink Step 2 Create an Image Overlay Open Google Earth and locate the approximate area where the map is located From the top toolbar select Add gt Image Overla
18. ch uses a Mercator projection while Google Earth expects image overlays to use Equi rectangular projection This introduces a distortion in the vertical scale which is usually not a problem but which becomes noticeable in cases like this where the vertical extent of the map is several hundred kilometers Appendix B Mercator projection correction B 1 KMZFactory v1 11 User Manual July 2014 Providing the map is correctly registered at the extreme top and bottom KMZFactory 1s able to apply a correction factor to Mercator projection maps when it divides the map up into tiles by applying a compensatory stretching factor to the tiles in the vertical dimension Here is the same map after being tiled into 5x5 tiles by KMZFactory permalink Shoriink This time the map is in good registration not just at the top and bottom of the image but also at the middle aur A a x The Mercator projection correction depends f on correct registration of the source map at the extreme top and bottom of the image and providing this has been done the resulting map shows a significant improvement in registration Appendix B Mercator projection correction B 2 KMZFactory v1 11 User Manual igs July 2014 Appendix C Removing unnecessary tiles with Google Earth Garmin GPS devices allow a limited total number of Custom Map tiles typically 100 This is a useful but not limitless resource and so it is useful to be able to
19. e Here you define how you want the output map to be divided into tiles Here you select some details about the output map KMZFactory v1 11 User Manual July 2014 Opening a map file When you first start KMZFactory the only thing you can do is select a map file WN kMZFactory 15 x f Source file Select KMZ file Select KML file You may choose three types of file 1 2 3 KMZ file This is a geo referenced image of the type created by Google Earth A KMZ file contains geo referencing data together with the image in a single file KMZFactory will only accept KMZ files which contain a single image KML file This is another type of geo referenced image and this type of file can also be created using Google Earth However a KML file contains just geo referencing data and a link to the image which is stored in a separate file KMZFactory will only accept KML files which contain a single image Image file KMZFactory can deal with two types of images jpeg and tiff If you select an image file by itself KMZFactory will need you to provide some additional information the latitude and longitude of the centre of the image and the horizontal and vertical scales of the image in metres per pixel KMZFactory v1 11 User Manual 22 July 2014 KMZFactory will not accept any non standard KMZ or KML files If there is some kind of error in the file you will be notified KMZFactory a A
20. e 8192x8192 available video memory 1744 MB Server kh google com 2011 Google Inc All Rights Reserved The Max Texture Size in this example 8192x8192 pixels is the maximum size for Image Overlays Any image which is larger than this limit will not display in Google Earth If you want to geo reference an image which is larger than this limit there are two workarounds you can use 1 Make a lower resolution image You can make a lower resolution version of the image For example if your image is 10 000 x 10 000 pixels make an image which is 8 000 x 8 000 pixels and geo reference this now visible image accurately in Google Earth Once this is done go to Step 3 Link the image to the overlay in the previous description and link to the full resolution image Then save this overlay in the usual way Although you have geo referenced a lower resolution image the values should still be pretty accurate providing you have not had to reduce the resolution too much Appendix A Geo referencing an image with Google Earth A 4 KMZFactory v1 11 User Manual 2o July 2014 11 Geo reference north south east and west separately Alternatively you can cut out the extreme top left corner of your image and geo reference it in the usual way Then make a note of the north and west co ordinates from the Location tab of the Google Earth Image Overlay dialog In a similar way cut out the extreme bottom right corner o
21. ero is not drawn but all other Draw Orders are visible A map with a higher Draw Order will always be drawn on top of and will obscure a map with a lower Draw Order The Draw Order can be useful 1f you have two maps of the same area drawn at different scales For example you may have a large scale map of the whole of Iceland and a highly detailed much smaller map just of the Reykjavik area If you give the map of Iceland a Draw Order of 20 and the map of Reykjavik a Draw Order of 30 you can be sure that the detailed map of Reykjavic will always be superimposed over the top of the map of Iceland KMZFactory v1 11 User Manual July 2014 Geo referencing parameters When a map source file has been successfully opened geo referencing parameters are initialized based on data contained in the source see also Revert button above Geo referencing Latitude Longitude box 7 Centre co ordinates and scaling metres pixel North 51 5394063969 South 51 521 7896384 Lat 51 53059801 76 y 0 424 7048031 East 0 1394591449 West 0 1719023277 Lon 0 1556807363 x 0 4231884342 L Scaling metres pixel PAR 0 9964295934 Units gt DECIMAL Rotate 0 0000000000 You may change any of these values if you wish KMZFactory allows you to modify the initial geo referencing of your map image in two ways Latitude Longitude box Latitude Longitude box North 51 5394063969 South 51
22. f the image and make a note of the south and east co ordinates If the corners cannot be accurately geo referenced if they are in the sea or in a featureless region for example you will have to select some other region along the edge of the image and geo reference each edge separately You can then enter these values for north south east and west into the KM7ZFactory geo referencing panel The Google Earth Image Overlay dialog gives co ordinates in degrees minutes and seconds accurate to two decimal places of the seconds of arc e g 51 32 21 86 N Although KMZFactory includes many more decimal places in the seconds field the Google Earth value is nevertheless extremely precise giving a location which is accurate to around 5 mm on the surface of the Earth Appendix A Geo referencing an image with Google Earth A 5 KMZFactory v1 11 User Manual July 2014 Appendix B Mercator projection correction Consider the following map of Iceland which has been geo referenced as an image overlay The black outline shows the position of the coastline according to Google Earth k permalink Shortin While the registration of the map is correct at the top and bottom of the image the registration is poor towards the middle as becomes apparent when we look at a detail of the coastline there Tot S The map is not in correct registration here because the source image was obtained from OpenStreetMap whi
23. how the map should be tiled using the Tiles panel Tiles Source pix Dest pix Dest num Horizontal gt lt siati 6320 6 Vertical Y 4615 923 5 Total The dimensions of the source image are displayed greyed out in this case 5320 x 4615 pixels If the source has been cropped the cropped width and height appear here rather than the source image dimensions You may specify tiling parameters either as tile dimensions in pixels 887 x 923 pixels per tile in the example above or as how many columns and rows of tiles there should be 6 columns x 5 rows in the example above The greyed out Total item gives the total number of tiles in the final output file 30 in the example above The tile dimensions in pixels will be automatically adjusted to fit the source image exactly In the example above the source image is 5 320 pixels wide and 6 columns of tiles have been specified Now 5 320 6 886 67 but the tile width in pixels is rounded up to 887 KMZFactory adjusts the tile pixel widths at the edge of the map so that the total width always exactly matches the source image width In this case the four middle tiles will each be 887 pixels wide and the two tiles at the start and end of each row will be 886 pixels wide 4 x 887 2 x 886 5 320 11 KMZFactory v1 11 User Manual July 2014 Output options The Output options section appears at the bottom of the KMZFactory dialog Output option
24. nd if the image file is neither a jpg or a tiff it will also be rejected KMZFactory If the file contains more than image you will be prompted to select an image to work on Click on the Overlay name of the image and then click the Select button ME KMZFactory image selecter 1 R egents Park Regents Park tif 2 Iceland Iceland tif Once a source file has been successfully opened KMZFactory remembers the folder where it was located and will start in that same folder the next time you want to open a source file KMZFactory v1 11 User Manual July 2014 Source file information Once you have successfully opened a map file you will be able to see some information about it in the upper panel named Source file Source file f ie KMZ file Image size 5420 x 4615 North gt Select KML file Path or Rotation South 2 241 83550 Select image file Image Draw Order East 21334591443 Revert Image Tag West KMZ file Path Image Image tag Image size Rotation Draw Order North South East West The name of the map file The location of the map file The name of the image file The name of the map The size of the image in pixels The rotation of the image 180 to 180 degrees The Draw Order of the map see below Geo referencing data for the image the latitudes and longitudes in degrees which define the image boundaries In the list above map file refers to the KMZ
25. oes is allow a much larger Custom Map size in pixels and file size It will split a large geo referenced image into a number of separate tiles each tile being no more than a certain size for example 1000x1000 pixels It will geo reference each component tile separately and it will combine all the tiles and geo referencing data into a single kmz file which can be uploaded to the Garmin GPS device When a map image is processed in this way it is then possible to create a Custom Map which consists of anything up to 100 map tiles each of 1000x1000 pixels If the tiles are arranged in a 10x10 square this means that a Custom Map can cover an extent of 10 000 x 10 000 pixels Unfortunately the Garmin imposed limitation of 100 Custom Maps per device refers to each individual map tile not the composite kmz files so while KMZ factory largely circumvents limitations 1 and 2 above it does nothing to avoid the third limitation of the total number of Custom Map images allowed on the GPS device KMZFactory v1 11 User Manual July 2014 The KMZFactory Dialog The full KMZFactory dialog is shown below SS KMZFactory o x Source file Select KMZ file KMZ file FegentsFark kmz Image size 9320 x 4615 North Select KML file Path O romaya Garmin KMZF lt Botston South 51521789638 Select image file Image PegentsPark jpg Draw Order o East 01394531443 Revert Image Tag Pegents Park West
26. or KML file which contains both the image and the geo referencing data and image file refers to the image file alone Since this information is specified within the source file it appears greyed out and cannot be changed If the source file is a simple image file without any geo referencing data the source file information is much simpler and just displays the Image file name and Path and the Image size in pixels Revert Source file Select KMZ file Image file Image size 7920 4615 Select KML file Path D romayasGarmin KMZFe KMZFactory v1 11 User Manual 2o July 2014 Revert button The Revert button appears in the upper Source file panel when a source file has been successfully opened When you first open a file KMZFactory sets some initial values for geo referencing parameters centre latitude and longitude rotation and metres per pixel based on the values defined in the source file If the source file is a simple image which does not contain geo reference data they are set to some reasonable initial default values The operator may then change the geo referencing parameters if necessary If the Revert button is clicked the initial geo referencing values are restored from the source file information Draw Order If there are two maps which overlap they are drawn according to Draw Order which is a number which can take values between 0 and 100 A map with a Draw Order of z
27. s Image Tag Regents Park Projection v MERCATOR Draw Order 20 JPG quality 30 Maximize compatibility I Create KMZ File The Image Tag item should be filled in with the name of the map The Projection item specifies the map projection of the source map see below The Draw Order item specifies the Draw Order of the map see above You may specify the quality of the JPG tiles as a number between 0 and 100 The default is 80 When you have completed all the fields on the dialog you can click on the Create KMZ File button The default name for the KMZ file will be the Image Tag with KF appended You can change the filename to whatever you wish but if you choose an existing file name you will see a warning message Confirm Save As i Regents Park KF kmz already exists Do you want to replace it It may take a few seconds to create the KMZ file particularly if the source image is large Usually some extra information is stored as comments within the KMZ file which can have any name you want The information includes the name of the source image any cropping parameters image dimensions etc But some Garmin units may not recognize the extra comment information and as a result the custom map will not be recognized If you check the Maximize compatibility box a stripped down KMZ file will be created without any of that extra information For maximum compatibility you should choose a short simple name which
28. which for the U K includes Ordnance Survey data Crown copyright and database right 2010 1i KMZFactory v1 11 User Manual 2o July 2014 Why use KMZFactory KMZFactory is a utility for making custom maps for Garmin GPS devices Such devices come with a low detail worldwide basemap and it is possible to purchase additional maps at greater detail These maps can however be costly and map coverage and availability worldwide is somewhat patchy Garmin have introduced the concept of Custom Maps which allows you to upload your own map to the GPS device The map needs to be in the form of a digital image which has been geo referenced to locate its position accurately on the globe Geo referencing may be conveniently achieved using Google Earth see Appendix A Geo referencing with Google Earth The output from Google Earth is a kmz file which contains the map image and geo referencing co ordinates which allow the Garmin GPS device to display the image in the correct location on the globe But there are some important limitations to Garmin Custom Maps 1 If the map is more than 1000x1000 pixels in size there will be a loss of resolution when it is uploaded to the GPS device 2 The map should be no more than 3Mb in size 3 There can be no more than 100 Custom Maps on the GPS device Limitations 1 and 2 above mean that it is not possible to show much more than a 1000x1000 pixel image in a Custom Map What KMZFactory d
29. which is used by Google Earth image overlays Mercator Most online mapping services such as Google Maps and Bing Maps provide Mercator projection maps In a Mercator projection the map can be thought of as a sheet of paper wrapped into a cylinder around the equator of the earth Features on the surface of the Earth are projected onto the cylindrical map Since this introduces a distortion which increases the further you travel from the equator a varying and compensatory compression 1s applied in the vertical direction so that local features remain more or less the same shape Mercator projection distortions only become important when the vertical extent of the mapped area is large over 100km KM ZFactory applies a correction factor to Mercator projection source maps when it creates the kmz output file so they match Google Earth image overlays much more closely see Appendix B Mercator projection correction When you geo reference a Mercator projection map you must ensure that the extreme top and bottom edges of the map are correctly positioned Due to the Mercator projection there will be an increasing discrepancy towards the centre of the map which you can safely ignore as KMZFactory will correct for this 13 KMZFactory v1 11 User Manual July 2014 Large image files Large image files can use considerable memory resources KMZFactory can deal with large image files providing you have enough memory available on your PC
30. y Google Earth File Edit View Tools Help Search Folder Ctrl shift n fF 871 S QD a e B Fly To Find na Placemark Ctrl Shift P Path Ctrl Shift T Fly to e g Hotels near JF Polygon Ctrl Shift G Model Ctrl Shift M Tour Photo Image Overlay Ctri 5Shift 0 Network Link e ae Oy 54 Bl 4B aye LP sy ee d ae 3 an imagea 202 BlUES kyj wh E AL A 5 ig mms n fF 2 Pa ae OY cad A TEAN Y DS ey gt Places Fy aera a AON A N A COOMA E p pn ed j so i gt a q gt Layers SHURE e meee Imagery Date 6 27 201 0 ZB 1945 51 31 33 65 N 008 43 49 Wi elev ES7 im 93 17 km mem OUDOT E So oe ete E Appendix A Geo referencing an image with Google Earth A 1 KMZFactory v1 11 User Manual July 2014 Step 3 Link the image to the overlay In the New Image Overlay window provide an appropriate name Regent s Park in this case and click on the Browse button to link your image to the overlay In this case the image is called RegentsPark jpg Google Earth New Image Overlay Name Regent s Park Link RegentsPark jpg Transparency Clear J _ Description View Altitude Refresh Location North 51 32 29 64 N East 0 8 9 93 W South 51 31 9 71 N West 0 10 S6 40 W Rotation 0 0000 Convert to LatLonQuad Fit to Screen Opaque The map image should now appear over the
Download Pdf Manuals
Related Search