Reach RS2 Datum

Reach RS2 / RS2+ RTK / PPK configuration
1

I am a new user of the RS2. I’m having trouble figuring out what default Datums (both horizontal and vertical) are used by the RS2. I can find nothing in ReachView that addresses this. I’ve used the Trimble Geo 7 for several years. I just logged a bunch of points with both the Geo7 and the RS2. I did PPK with both datasets using the same CORS station data. Horizontal coordinates are off by about a meter and vertical is off by about 16.5 m. The Geo7 is using WGS84 and I assume that the RS2 is using the same so I can’t figure out why the difference. The vertical issue looks like a vertical datum issue. The Geo7 is set to log vertical data as height above ellipsoid.

Any suggestions?

2

Are you sure that the Geo7 is set to log above ellipsoid?
What Base Coordinates did you use for PPK?

It must be an Input error somewhere, as the z-axis error is too great for even uncorrected GNSS error margins.

3

Hi David,

At the moment, Reach RS2 supports WGS84 Latitude/Longitude and WGS84 ellipsoid height.

What software do you use for PPK? Do you use the same base coordinates for Geo7 and Reach RS2?

4

OK, I now realize that the Trimble is set to log height above geoid, not height above ellipsoid so this explains the ~16.5 m difference.

I do hope that Reachview will soon add the ability to use geoid height rather than ellipsoid height.

5

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