MorePosted By Laurie Weatherston on 11/17/2009 at 5:05 PM
After running a few searches and reading many several comments, as well as articles on datums and realizations, I still have an unsolved mystery, which my eqiupment rep. also can't solve:
Using the SPC (particular zone) coordinates from an OPUS solution (Static, 4-hour, precise - 96% OBS USED, 100% FIXED AMB, 0.012M OVERALL RMS - NAD 83 CORS 96, EPOCH 2002.0000), the coordinates I get for 2 monuments I've shot (repeated observations) with published coordinates (NAD 83/94) (1 NGS and 1 DOT) are shifted +/- 7cm north and +/- 10cm west from the published coordinates (grid). I'm using Topcon Equipment set to NAD83_NO_TRANS datum. When I inverse between points I've observed which also appear on others" recorded maps on SPC, our bearings and distances agree within 1-2 sec's and a few hundredths.
Any suggestions?
Thank you in advance.
To read the rest of this thread go to www.i-boards.com/bnp/pob/messages.asp?MsgID=1497033&ThreadID=141246&IsResponse=False#1497033.
After running a few searches and reading many several comments, as well as articles on datums and realizations, I still have an unsolved mystery, which my eqiupment rep. also can't solve:
Using the SPC (particular zone) coordinates from an OPUS solution (Static, 4-hour, precise - 96% OBS USED, 100% FIXED AMB, 0.012M OVERALL RMS - NAD 83 CORS 96, EPOCH 2002.0000), the coordinates I get for 2 monuments I've shot (repeated observations) with published coordinates (NAD 83/94) (1 NGS and 1 DOT) are shifted +/- 7cm north and +/- 10cm west from the published coordinates (grid). I'm using Topcon Equipment set to NAD83_NO_TRANS datum. When I inverse between points I've observed which also appear on others" recorded maps on SPC, our bearings and distances agree within 1-2 sec's and a few hundredths.
Any suggestions?
Thank you in advance.
To read the rest of this thread go to www.i-boards.com/bnp/pob/messages.asp?MsgID=1497033&ThreadID=141246&IsResponse=False#1497033.
