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 wrote:
>
> Hi Bob,
>
> You are confusing the readers here.
>
> 1) zero altitude relative
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 ell
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 wrote:
>
> I would buy that (Google M
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. Thi
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.
Demia