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| Subject: | RE: GISList: GPS and powerline question |
| Date: |
02/12/2003 11:27:46 PM |
| From: |
Hrishikesh |
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Hi,
The electromagnetic field of GPS signals interferes with the field due
to power lines. So you are finding a shift.
The shift may also be due to the heavy vegetation. If you are not
getting open sky then some noise will creep in and you will not get a
right triangulation. Hence an error in position.
Temperature has nothing to do with the positional accuracy of GPS value.
So you can avoid taking GPS reading near the electric poles, power
cables and under the vegetation.
Regards,
Hrishikesh Prasad
-----Original Message-----
From: Mohammad A Rajabi [mailto:marajabi@hotmail.com]=20
Sent: Thursday, February 13, 2003 1:37 AM
To: virginia michelin: Gislist (E-mail)
Subject: Re: GISList: GPS and powerline question
Hi,
It is the powerlines which create this problem. Try to stay away from
them
as much as you can.
Mohammad
----- Original Message -----
From: "virginia michelin" <vmichelin@hydroqual.com>
To: "Gislist (E-mail)" <gislist@geocomm.com>
Sent: Wednesday, February 12, 2003 12:56 PM
Subject: GISList: GPS and powerline question
Hello All,
We use a Magellan Meridian GPS unit to gather locations and up until
recently it has worked fine. One project we are working on has us
working
under powerlines, which causes data (waypoints) to be erased or shifted
(we
haven't been able to determine what the shift is as the area is heavily
vegetated (low lying) and we couldn't mark points on a map). Does
anyone
know whether powerline could cause these problems or if cold 20=B0 F
weather
is problematic? Thanks in advance.
Virginia
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