topic Re: ArcGIS Mobile and RTK GPS in ArcGIS for Windows Mobile Questions

ArcGIS Mobile and RTK GPS

PaulSchneider — Wed, 04 May 2011 19:01:02 GMT

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...

Re: ArcGIS Mobile and RTK GPS

AlexMahrou — Mon, 09 May 2011 03:28:23 GMT

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?

Re: ArcGIS Mobile and RTK GPS

PaulSchneider — Mon, 09 May 2011 15:19:57 GMT

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.