Note: COLUMBUS Network Adjustment Software Version 3.6 allows you to use the NGS (big-endian and little-endian) Geoid03 grid files directly. Purchase your upgrade today!

To use National Geodetic Survey (NGS) Geoid03 with COLUMBUS Network Adjustment Software Version 3.0 through Version 3.2, do the following:

Convert the NGS Geoid03 (big-endian) grid files to NGS Geoid03 (little-endian) format. See the following NGS Web page for information on how:

http://www.ngs.noaa.gov/GEOID/GEOID03/
In COLUMBUS, simply select the Geoid99 model option and supply the applicable NGS Geoid03 (little-endian) converted grid file.

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