"and this places it off the west coast of Ethiopia.?" A familiar issue for many of us with the wrong CRS or reversing the easting and northing. I wasn't quite sure what the solution for the problem was though. Could you georeference the raster?
With GPS heights the rule of thumb, handed to me by an old and crusty land surveyor, for GPS's is vertical error = 2x Horizontal error. The first question is what GPS you are using. In am not sure but Garmin64 is not a precise GPs so you might have an inherent 1-2m error horizontally on a good day which would translates to 2-4m vertically. The second one is trees. As Nicolas Cadieux noted STRMs are affected by trees but equally so are GPS's. I think we have converging error factors that would explain the elevation differences. I am not sure carrying a barometer about is the solution. In practical terms I usually carry GPS, Camera, notebook, Phablet plus a spare power source all of which are getting a bit heavy a barometer might just be too much. Cheers Dr Iain Stuart JCIS Consultants P.O. Box 2397 Burwood North NSW, 2134 (02) 9701 0191 (0413) 380116 (m)
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