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GPS/CORS coordinates
Posted: Wed Jun 02, 2010 3:49 pm
by land butcher
I recently noticed that the difference between 2000.35 and 2007 coordinates for LBC1 are about 5ft different. I didn't check but I assume others changed about that much also.
Anyone know why the big change. I know we are moving here, but not 5ft in 7 years.
Posted: Wed Jun 02, 2010 5:32 pm
by dmi
For every station there is a log kept and the answers will be in there, if in fact the station was relocated.
Posted: Mon Jun 07, 2010 11:56 am
by land butcher
Well maybe someone can explain this to me.
CORS sta LBC1 in Long Beach.
In comparing the values between the 2007 NGS data sheet and 2007 Sopac data sheet the Lat/Longs agree to the 5th decimal place but the meters are different X by 0.72m, Y by 1.32m
Even 2000 XYs differ.
ITRF
Posted: Mon Jun 07, 2010 12:04 pm
by Steve Martin
On the CSRC web site the X,Y,& Z are published on the ITRF 2005 datum while the Lat, Long & ellip. ht. are published in NAD83 (NSRS2007.00) datum so you are not comparing apples with apples there.
Posted: Mon Jun 07, 2010 1:15 pm
by land butcher
thank you.