Leica GPS900 Series, Technical Reference Manual

Page: 72 / 287

Managing, Creating, Editing Coord Systems GPS900 72
4.7 Geoid Models
4.7.1 Overview of Geoid Models
Use in the field For use on the RX900 in the field, geoid field files are created from the geoid model.
Geoid field file The geoid separations in a geoid field file may be used in the field to change between ellip-
soidal and orthometric heights.
Creating a geoid model
on RX900 Geoid models can be created on the RX900 in one of two ways:
Creation: In LGO with export into the internal memory of the RX900.
Extension: *.gem
1.
Here the geoid field file is stored in the internal memory of the RX900. It is recom-
mended for large geoid field files. This method is explained in this chapter.
2.
Here the geoid field file is transferred to the System RAM and can be used at any
time. The total size of all files in the System RAM is restricted to 1 MB. Refer to "22
Using the Tools - Transferring Objects" for information on how to transfer geoid
field files to the System RAM of the RX900.
Geoid field file in
internal memory of
RX900
Creation
Geoid model
on the RX900
Geoid field file in
internal memory of
RX900
Transfer Main
Menu:
System
RAM
Creation
Geoid model
on the RX900