User defined system

To Create a Custom Spatial Reference System (SRS)

To find a spatial reference system, you can visit .

PROJ.4

PROJ.4 declaration allows to enter a custom projection system (for instance "+proj=utm +zone=11 +datum=WGS84").

See also .

Well Known Text (WKT)

OpenGIS Well Known Text format for coordinate systems can be provided in an attached PRJ file. In such case, enter the projection file path as SRS definition (for instance "C:\projections\myProjection.prj").

Example of WKT definition contained in a PRJ (.prj) file:

GEOGCS["WGS 84",
    DATUM["WGS_1984",     
					   SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG",7030]],
        TOWGS84[0,0,0,0,0,0,0],
        AUTHORITY["EPSG",6326]],
    PRIMEM["Greenwich",0,AUTHORITY["EPSG",8901]],
    UNIT["DMSH",0.0174532925199433,AUTHORITY["EPSG",9108]],
    AXIS["Lat",NORTH],
    AXIS["Long",EAST],
    AUTHORITY["EPSG",4326]]

Additional data

Some spatial reference systems use external dependencies which, prior to their use, must be installed in the "data\gdal" subdirectory of ContextCapture installation directory.

For instance, a spatial reference system with a custom vertical coordinate system may use a GTX grid to approximate the geoid.