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ArcGIS Mobile and RTK GPS

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05-04-2011 12:01 PM
PaulSchneider
by
Regular Contributor
‎05-04-2011 12:01 PM
Easy question for the Mobile Development Team:

Does ArcGIS Mobile 10 work reliably with RTK GPS?

Our project scope is fairly simple; we want elevations of infrastructure features (sanitary/storm manholes etc.); and while the field crew is there, get GIS information.  In testing it we are getting the RTK signal but are getting strange geographic transformation results.  Even with our data and the map in WGS_1984, we get strange results...  Seems like this should just work...
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2 Replies
AlexMahrou
by
Deactivated User
‎05-08-2011 08:28 PM
Easy question for the Mobile Development Team:

Does ArcGIS Mobile 10 work reliably with RTK GPS?

Our project scope is fairly simple; we want elevations of infrastructure features (sanitary/storm manholes etc.); and while the field crew is there, get GIS information.  In testing it we are getting the RTK signal but are getting strange geographic transformation results.  Even with our data and the map in WGS_1984, we get strange results...  Seems like this should just work...


What do you mean by strange geographic transformation results? Is this a traditional single-base RTK setup? Is the base coordinate in the WGS_84 reference frame on the Horizontal/Vertical?
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PaulSchneider
by
Regular Contributor
‎05-09-2011 08:19 AM
What do you mean by strange geographic transformation results? Is this a traditional single-base RTK setup? Is the base coordinate in the WGS_84 reference frame on the Horizontal/Vertical?


Yes single-base RTK. 

Strange results meaning I'm shooting surveyed control points and getting a coordinate pair incorrect by ~1.6ft x-dimension, ~3.0ft y-dimension, ~1.8ft z-dimension.

We're getting RTK NMEA strings from our reciever in WGS84; when ArcGIS Mobile 10 projects these to a map service in our local coordinate system (based on 1983 HARN), the conversion is inaccurate. 

We've tried several of Esri's geographic transformations and even generated a few of our own (applying the aforementioned translations), all returning poor X,Y,Z results.

The best result we can get is with our mobile service in WGS84, letting Desktop handle the reprojection back in the office.  This does seem to work, but the Z-translation still needs to be visited programmatically.

In case followers of this thread are wondering how I am getting Z; I'm using this sample. RTK users be warned however... the sample does not yield an averaged Z.
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