Hi Bob,
You are confusing the readers here.
1) zero altitude relative the WGS84/GPS ellipsoid are often tens of
meters over or below sea level, depending on your location.
2) zero altitude relative to a geoid (EGM96 or something else) is very
close to sea level.
Then if you think of the
Hi
One of our standing jokes when we lived by the shore was that we actually
lived underwater. The GPS routinely put is 30 to 50’ below sea level ….
Bob
On May 20, 2015, at 3:36 AM, Björn Gabrielsson b...@lysator.liu.se wrote:
Hi Bob,
You are confusing the readers here.
1) zero
Hi
The gotcha is that the GPS numbers are related to a geoid model and not to sea
level.
You can indeed find points that are “underwater” based on the geoid, but quite
dry in
real life (and vice-versa).
Bob
On May 19, 2015, at 12:26 PM, Demian Martin demianm@gmail.com wrote:
I would
I would buy that (Google Maps being off) except that I'm less than 2 miles from
the SF bay and -5M would have me underwater. That may well happen but not for a
few years at least. Also the Arbiter does match Google maps pretty closely. It
doesn't really matter a lot, just a curiosity.
Which altitude do you have the Thunderbolt set up to report?
If you have the datum set to WGS-84, the Thunderbolt can report either HAE
(height above ellipsoid) or MSL (height above the geoid model) in its
serial output. The choice is controlled by bit 2 of byte 0 of the 0x35
command packet.
