Adding DEM Files To a Surface

Topics in this section

About DEM Files
Use digital ground model (DGM) files or SDTS files converted to a DGM format to import points into a surface.
About DGM File Data
DGM files typically contain land XYZ information at a regular grid-spaced interval to represent ground relief.
To Add DEM Files to a Surface
About Changing the Specified Coordinate System of a DEM File
Use the Prospector tree to specify or change a DGM file coordinate system. If the DGM file coordinate system is different from the current coordinate system of the drawing, you can specify a coordinate system for the DGM file. The coordinate system you specify for the DGM file should match the data defined in the DGM file itself.
To Change the Specified Coordinate System of a DEM File
To Import DEM Extents
To Zoom or Pan to DEM File Data
To View DEM File Properties
About DEM Files and Memory Usage
Large Triangulation surfaces, such as those built from DGM files, can require a substantial amount of memory (RAM and virtual memory) and disk space to build and save the surface. Triangulation surfaces require about 100 bytes per point, whereas grid surfaces require about 16 bytes per point.

Parent topic: Adding and Editing Surface Data