version 4 format introduced 7/30/2014

 Verstion 2 File format



The file consists of the following elements:

The single file provides the smaller advantages:

The new format will be used to write all files, but the program will continue to read the old format. 

Missing data is recorded as elevation 32767.

The organization of the elevation data in the file follows the conventions established by NGA and USGS for the ASCII DEMs (but abandoned for SDTS DEMs which follow imagery conventions).  

The old format used two files:

Header portion of a DEM:


60   Offset to Header

192  Offset to DEM


Last revision 2/11/2018