From CC help: To Create a Custom Spatial Reference System (SRS) To find a spatial reference system, you can visit http://www.spatialreference.org/ . PROJ .4 PROJ .4 declaration allows to enter a custom projection system (for instance "+ proj =utm +zone=11 +datum=WGS84"). See also http://trac.osgeo.org/ proj /wiki/GenParms . 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. You can create custom spatial reference systems in three steps: Select the item Define new user system to start the creation of a new spatial reference system. Figure 1. Starting the creation of a new user defined system Click on Edit to define the new spatial reference system. Enter a display name and the definition of the new user defined system. Any well known SRS definition can be entered, which includes PROJ.4 declarations, Well Known Text (WKT), or the name of a PRJ file containing a definition. To find a spatial reference system, you can visit www.spatialreference.org . Vertical GTX Grid Instruction: https://communities.bentley.com/products/3d_imaging_and_point_cloud_software/f/contextcapture-descartes-pointools-forum/153294/create-user-defined-system/458045#458045 Example of vertical coordinate system setup: https://communities.bentley.com/products/3d_imaging_and_point_cloud_software/f/contextcapture-descartes-pointools-forum/152721/contextcapture-latvian-vertical-coordinate-system-datums
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