I am trying to change my WGS84 data to NAD83 for Alberta data. My research tells me that I need to use the NAD_1983_TO_WGS_1984_8 Datum Transformation which is in the AB_CSRS.gsb. I can not find this gsb file for download on the internet. I did manage to find and obtain the NTv2_0.GSB but that seems to only be for NAD27 To NAD83.
Does anyone know where I can get the AB_CSRS.GSB file?
Thanks
Answer
The AB_CSRS file seems to have been replaced with abcsrsv4.dac. Esri hasn't added another transformation to use the new file yet (we don't have a copy). You could rename it and use the NAD_1983_To_WGS_1984_8 transformation, or create a new transformation with the geoprocessing tool, Create Custom Geographic Transformation. You will still have to change the extension from .dac to .gsb.
I wasn't able to find information about the file on the Alberta Geodetic Control Unit website, but others have said to contact the director, Geoff Banham.
Note: I work for Esri.
No comments:
Post a Comment