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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: [gislist] GPS Accuracy (Garmin Units) |
| Date: |
07/08/2004 10:05:01 AM |
| From: |
Robert Heitzman |
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If your accuracy needs match that of the WAAS units why not use them?
There is lots of freeware/cheapware out there that capture data from GPS
devices. The DNR addin may work for you. GPS TrackMaker is my favorite, not
being an ESRI user. The Pro version is under $100 and can make shapefiles
from the downloaded data. A freeware version is available as well.
Note that the DOQQs have an accuracy less than the WAAS units (50' if memory
serves me) and combining the two will impact overall accuracy.
>I need to be able to correctly place some scanned
>linework on top of some DOQQ's, the problem I am
>running into is there are no discernable features
>commonplace on the linework and the DOQQ's. I was
>hoping to use a GPS to mark some points on the
>linework in the field and import these points as
>shapefiles so I will have something to go by when I
>attempt to place the linework on the DOQQ's correctly.
>I did not want to purchase a trimble pathfinder unit
>and the trimble office software due to cost restraints
>and was looking into using a Garmin Unit, with the
>software "DNR Garmin" available from the DNR in
>Minnesota. This will be less accurate than the Trimble
>units but I was reading on the Garmin website that
>WAAS units have accuracy less than 3 meters. Has
>anyone used the Garmin units with WAAS and what has
>been your experience and or opinion about this in
>regards to positional accuracy?
>
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