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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: Help! DRGs and GPS |
| Date: |
02/13/2002 07:37:16 AM |
| From: |
Muzrall, Daniel D. |
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Hello all,
I've run into a bit of a problem: Our office is working on a large project
involving towns in both NH and VT. Part of our scope of work involves
recording GPS data, and then overlaying the data on a DRG. The DRGs,
obtained from Micropath, are in UTM27 Meters, Zone 19. So I've corrected
the data, and exported it into the appropriate coordinate system. Most of
the time this procedure works without a hitch, however, for certain town the
data is offset by a fair degree (i.e. points situated within the town
borders in reality, fall outside the town borders on the DRG.) The offset
appears to be generally west or southwest, and the distance is approximately
the same
Also, I've noticed when clipping some of the DRGs (using Micropath's
MapClipper software), that the "edge" of some of the clipped DRGs don't sit
flush with the adjacent DRG, there's a gap of 0.5-1" east-west onscreen
between the two, which leads me to believe that the two issues are related.
My question is: Has anyone run into this problem before, and what did you
do to resolve it?
Thanks in advance,
Dan
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Daniel D. Muzrall
Computer Officer/Environmental Scientist
Roy F. Weston, Inc.
Superfund Technical Assessment
and Response Team (START)
37 Upton Drive
Wilmington, MA 01887
p: 978-657-5400 x227
f: 978-658-0700
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