In the middle of some stuff at the moment, don’t know the answer off the top of my head so let me look it up and consult with my brother than land surveyor.
Thank you, Brian Webster www.wirelessmapping.com From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of ch...@wbmfg.com Sent: Tuesday, May 5, 2020 2:20 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Elevation question I think shuttle data and GE elevations are referenced to a geoid. Not sure if the both use the same geoid. I just want to know which number to use from my machine. Or if I have to do math and use them both to get an elevation that will agree with the shuttle elevations in RM... I agree, Ignorance was bliss... From: Lewis Bergman Sent: Tuesday, May 5, 2020 12:15 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Elevation question 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 _____ -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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