Elevation differences between GPS receivers usually come from the
elevation reference used, i.e. from the ellipsoid or the geoid, even
from the geoid being used.
Regards,
Ignacio , EB4APL
El 20/12/2016 a las 7:28, Tom Curlee escribió:
A couple of questions:
I've just started using LH 5.0 with my 2 GPSDO units (Thanks Mark!) - a
Trimble UCCM and a Z3801A. Oddly, I'm very getting different survey altitude
values. The Z3801A is around 81 M, which agrees within 1 or 2 meters with
Google maps (not a perfect source, but close), but the UCCM is usually around
48M to 53M depending on which survey I want to believe. Both receivers are
locked and both are fed off the same antenna through a splitter. I admit that
the antenna placement is very poor - anything below 60 degrees elevation to the
north is blocked (LH is great for antenna placement analysis). Anyone have any
ideas?
A question on LH usage. When the UCCM is in the position hold mode, what
happens when a precision survey is run? Looking at the .lla file shows that
every position, including the final processed location, is the same as that
shown as the position hold location on the main LH screen. Do you need to take
the receiver out of the hold mode to run a precision survey? How? How is the
position scatter plot used with a survey? I usually don't see any positions
plotted, certainly not when running a precision survey. I think I saw data
plotted when I did an internal survey.
Many thanks for any info. And thanks again to Mark and John for all the work.
Tom
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