discrepancy with post processed GPS data

CharlottePeters — Mon, 16 Sep 2013 23:12:47 GMT

Hi,
I've run into spatial discrepancies with some GPS data I collected, and I don't know if the issue is with ArcPad, GPSCorrect or Pathfinder Office. Maybe everything is correct and I'm just looking at it wrong!

I collected some road data with a GeoXT using ArcPad and GPSCorrect (WAAS enabled). I post processed the data in Pathfinder Office (PFO). I used the corrected *.ssf file to ShapeCorrect the original road shapefile and also exported the *.cor file into a point shapefile. I overlay the original shapefile, ShapeCorrect file and exported *.cor file into ArcMap and was surprised to see that the "ShapeCorrect"ed file did not overlay the exported *.cor file (see attached). I would've expected the corrected files to overlay each other. Should I be looking at the *.cor file as an intermediary file to the "ShapeCorrect"ed file rather then its equal or do I just have an incorrect projection setting somewhere in the process? I listed equipment, software and settings used below.

Hardware / Software:
GeoXT 2005 series
ArcPad 7.0.1
GPSCorrect 2.11 with WAAS enabled
Pathfinder Office 4.0
ArcGIS 10.1

Settings:
ArcPad datum - WGS84
ArcPad datum transformation - NAD_1983_To_WGS_1984_4
ArcPad project projection - CA Teale Albers, NAD83
Shapefile - CA Teale Albers, NAD83
PFO shapefile export - CA Teale Albers, NAD83 (conus) CORS96
PFO base station coordinates - ITRF

Thanks, Charlotte

topic discrepancy with post processed GPS data in ArcPad Questions

discrepancy with post processed GPS data