WTF. Ignorance was bliss. Thanls for screwing that up for me Chuck. Now I have to actually think about what to use again. I default back to Google Earth.
On Tue, May 5, 2020 at 1:12 PM <ch...@wbmfg.com> wrote: > I have a pretty good GPS receiver. Trimble R8 with a Yuma data > collector. Normally we use it only for lats and longs. > It is corrected in real time with a cellular data modem and a RTK/VRS > ground station network. > > Yesterday we did a shot from a hill that did not exist when shuttle radar > data was taken. It was way off in elevation. > So we took a shot from our parking lot and compared it with what we think > we know to be the altitude as well as our cell phones and google earth. > > Turns out the R8 has an ellipsoid height as well as another height > associated with the northing and easting values. > The second one seems to be more in line with what I was expecting. > The local dealer sent me a drawing showing this. (attached) > > So now I am super confused. Not sure what number to use when working with > Radio Mobile. Do I add the geoid height to the ellipsoid height? > > Was hoping Brian Webster may know or others may know. Googling google > earth elevation talks about different versions of geoid. Not sure if their > elevations are geoid elevations or not. > > So, rather than dig into it any more I am taking the lazy approach and > posting the question here. > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Lewis Bergman 325-439-0533 Cell
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