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DEFINE_PROJ

Updated

DEFINE_PROJ

The DEFINE_PROJ command allows a projection (including datum) to be associated with a name. The projection name can then be used in later IMPORT, IMPORT_ARCHIVE, IMPORT_ASCII, and LOAD_PROJECTION commands to specify a projection as needed.

The DEFINE_PROJ command consists of a single command line followed by a series of lines describing the projection in the format of an ESRI PRJ file. The easiest way to determine the text for a projection is to setup a projection on the Projection tab of the Tools->Configuration and then use the Save to File button to create a new .prj file. Then just open the .prj file up in Notepad and copy the contents to the lines following the DEFINE_PROJ command line.

The DEFINE_PROJ command is terminated with a single line containing only the text END_DEFINE_PROJ.

For a sample of the DEFINE_PROJ command in use, load some data and then save a Global Mapper workspace file from the File->Save Workspace menu command. Open the resulting .gmw file in an editor and you can see how the DEFINE_PROJ command is used to define a view projection and the set it.

The following parameters are required by the DEFINE_PROJ command.

  • PROJ_NAME - specifies the name to associate with the projection

SAMPLES

DEFINE_PROJ PROJ_NAME="UTM_ZONE30_WGS84"
Projection     UTM
Datum          WGS84
Zunits         NO
Units          METERS
Zone           30
Xshift         0.000000
Yshift         0.000000
Parameters
END_DEFINE_PROJ
DEFINE_PROJ PROJ_NAME="SPCS_ZONE502_NAD83"
Projection     STATE_PLANE
Datum          NAD83
Zunits         NO
Units          INTERNATIONAL FEET
Zone           502
Xshift         0.000000
Yshift         0.000000
Parameters
END_DEFINE_PROJ
DEFINE_PROJ PROJ_NAME="EQUIDC_WGS84"
Projection     EQUIDISTANT_CONIC
Datum          WGS84
Zunits         NO
Units          METERS
Xshift         0.000000
Yshift         0.000000
Parameters
40 0 0.00000 /* latitude of the standard parallel
-80 0 0.00000 /* central meridian
0 0 0.00000 /* latitude of the origin
0.0000 /* false easting (meters)
0.0000 /* false northing (meters)
END_DEFINE_PROJ

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