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ENVI

Convert Map Coordinates

Convert Map Coordinates

Use Map Coordinate Converter as a calculator to convert a pair of values in one coordinate system into a new coordinate system.

Note: To copy coordinates from the Cursor Value window or a text file to use in the converter, copy the coordinates before you open the Map Coordinate Converter dialog.

You can also write a script to convert coordinates using one of the following routines:
ENVIConvertGeographicToMapCoordinatesTask
ENVIConvertMapToGeographicCoordinatesTask
ENVIStandardRasterSpatialRef

  1. From the Toolbox, select Geometric Correction > Map Coordinate Converter. The Map Coordinate Converter dialog appears.
  2. In the Coordinate System 1 area of the dialog, click Select Coordinate System. The Select Coordinate System dialog appears.
  3. Select a predefined coordinate system or create a new coordinate system, then click OK to return to the Map Coordinate Converter dialog.
  4. Enter the coordinates of the known point.
    • If you copied coordinates from the Cursor Value window or a text file, select the radio button for the correct units before pasting (for example, if pasting units in decimal degrees, select Decimal Degrees), then click the Paste button.
    • Use the Copy button to copy existing values from Coordinate System 2.
    • For manual coordinate entry: if you selected a coordinate system that is geographic, enter the value pair in Decimal Degrees (lon/lat), or Degrees Minutes Seconds (lon/lat). For example:

      Decimal Degrees

      [23.711473E, 37.960425N] = [ 23.711473, 37.960425]; east and north are positive.

      [35.045254E, 18.611708S] = [ 35.045254, -18.611708]

      [105.21762W, 40.000072N] = [-105.21762, 40.000072]

      [51.189371W, 29.914483S] = [-51.189371, -29.914483]; west and south are negative.

      Degrees Minutes Seconds

      105°13'3.4503600"W, 40°0'0.2758320"N

      40°0'0.2758320"N, 105°13'3.4503600"W

    • For manual coordinate entry: if you selected a coordinate system that is projected, enter the value pair in Decimal Degrees (lon/lat), Degrees Minutes Seconds (lon/lat), or Linear Units (typically meters or feet entered as x, y). For example:

      Linear Units

      481423.5997814895, 4427788.3998949900

  5. In the Coordinate System 2 area of the dialog, click Select Coordinate System. The Select Coordinate System dialog appears.
  6. Click Forward to convert the point in the Coordinate System 1 projection into the Coordinate System 2 projection type. Or, click Reverse to convert the point in the Coordinate System 2 projection into the Coordinate System 1 projection type.

    If you need to clear the coordinates and reset the pair value to 0, click Reset.

  7. Click OK.



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