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MicroSurvey Software Inc. • View topic - recoordinating raw gps files; correcting for the wrong AH

recoordinating raw gps files; correcting for the wrong AH

Discussion of FieldGenius related issues and questions.

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recoordinating raw gps files; correcting for the wrong AH

Postby mlbrack » Fri Jul 28, 2006 2:49 pm

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Joined: Wed Jul 06, 2005 1:36 pm

Postby Jason Poitras » Mon Jul 31, 2006 3:31 pm

Yes this can be done with FieldGenius. In our next service pack 2.0.5 which is currently being beta tested you will be able to do this with just a few clicks. For now you will need to manually edit a record in your raw file before processing.

In the raw file you should be able to find the following record:

VA,PV3,N 0.0000,E 0.0000,LZ0.0000,SO0.00000,SA0.00000,GNUnited States NAVD88

Make sure you edit the last VA record in the raw file and change the GN data type to Ellipsoidal:

VA,PV3,N 0.0000,E 0.0000,LZ0.0000,SO0.00000,SA0.00000,GNEllipsoidal

Once you complete this, you can go to Settings | GPS Local Transformation and set the Origin N & E, Trans N & E, Slope N & E, and rotation to zero. Leave the scale set to 1.

Now press the Adjust Points button and FieldGenius will re-process the GS records based on the EP records. During reprocessing it will use the mapping system defined in the GN data type. I suggest noting the elevation of a couple of points before processing so you can compare the new elevations. As a check, the delta elevation should be roughly equal to the geoidal seperation.

You might be asking why you have to manually edit the raw file? Well that is because the datum settings only get written to the raw file upon a connection to a GPS receiver. This has been changed in 2.0.5.
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