Show Menu
TOPICS×

Latitude-Longitude Projections

The latitude-longitude projection format (LatLonProjection) in the Terrain Images.cfg file is defined by four parameters for latitude and longitude.
To specify a LatLonProjection for unprojected images (raw unprojected bitmaps and general images, unprojected), you can enter settings for the LatLonProjection within the Terrain Images.cfg window in data workbench. See To specify a LatLonProjection for unprojected images .
To specify a LatLonProjection for images with embedded projection information, you must open the Terrain Images.cfg file in a text editor such as Notepad, set the Projection Info parameter to “LatLonProjection”, and add settings for the LatLonProjection. See To specify a LatLonProjection for images within embedded projection information... .

To Specify a LatLonProjection for Unprojected Images

  1. Open the Terrain Images.cfg file in data workbench and add a terrain image layer source as described in To define a terrain image layer .
  2. Edit the Projection Info parameters using the following parameters table as a guide:
    Parameter
    Description
    Lat0
    The latitude of the top edge of the image, in degrees, where 90 is the North Pole and -90 is the South Pole.
    Lat1
    The latitude of the bottom edge of the image.
    Lon0
    The longitude of the left-hand edge of the image, in degrees, where positive numbers are east and negative numbers are west longitudes.
    Lon1
    The longitude of the right-hand edge of the image.
  3. Save the file by right-clicking (modified) at the top of the window and clicking Save .
  4. To save the locally made changes to the data workbench server machine, in the Server Files Manager, right-click the check mark for Terrain Images.cfg in the Temp column, then click Save to > < server name > .

To Specify a LatLonProjection for Images Within Embedded Projection Information

  1. In the Server Files Manager, click Components to view its contents. The Terrain Images.cfg file is located within this directory.
  2. Right-click the check mark in the server name column for Terrain Images.cfg, then click Make Local . A check mark appears in the Temp column for Terrain Images.cfg.
  3. Right-click the newly created check mark in the Temp column and click Open > in Notepad . The Terrain Images.cfg file appears in a Notepad window.
  4. Edit the Projection Info parameters using the following sample file fragment as a guide. Be sure to specify the projection type as highlighted below. For descriptions of the parameters, see the LatLonProjection Parameters table in the previous procedure.
    Projection Info = LatLonProjection: 
      Lat0 = double: 90
      Lat1 = double: -90
      Lon0 = double: -180
      Lon1 = double: 180