I noticed that my Stratologger CF reports negative values for ground elevation and I'm not sure how to interpret that information.
Example: Google Earth show the elevation of my launch site is 110 ft. So I launch a rocket there and look at the SLCF's recorded flight data. It shows:
Apogee: 2,832 ft. AGL
Ground Elevation: -191 MSL
If Google Earth shows my launch site elevation as 110 ft how do I rationalize a SLCF Ground Elevation value of -191 ft?
Example: Google Earth show the elevation of my launch site is 110 ft. So I launch a rocket there and look at the SLCF's recorded flight data. It shows:
Apogee: 2,832 ft. AGL
Ground Elevation: -191 MSL
If Google Earth shows my launch site elevation as 110 ft how do I rationalize a SLCF Ground Elevation value of -191 ft?