The Kinematic software package might be of interest to you, the URL is: http://www.precision-gps.org/
The goal is accurate (20-50cm) GPS measurements from inexpensive GPS receivers (possibly multiple). I haven't used it but it looks really interesting. Jonathan On 8/5/07, Ben Discoe <[EMAIL PROTECTED]> wrote: > Hi list, > > Like a great many people, i can afford consumer GPS units (~$100) but not a > 'professional' unit (~$4000-8000). Of course, the well-known lack of > accuracy in consumer units (~10m) is nowhere near usable for many > applications. > > The solution that springs to mind would be a cheap differential: > 1. Buy a second consumer GPS unit. > 2. Tie it to a post or other fixed object. > 3. Walk around, gathering data with the first GPS. > 4. Download data from both units. > 5. Using the timecode to correlate, subtract the second unit's drift from the > first unit's coordinates. > > >From everything i've read, it seems to me that would bring the 5-10m error > >down to 1-2m. However, i didn't find any software to do this simple > >operation. > > There is plenty of information out there about fancier DGPS using WAAS or > other things which are not widespread and/or not reliable > (http://www.gpsinformation.org/dale/dgps.htm) > > There is high-end proprietary software like GrafNav > (http://www.novatel.com/products/waypoint_grafnav.htm) which apparently costs > thousands of dollars. > > But it should be a really simple operation to subtract one track's offset > from another. Is there some reason this simple approach wouldn't work? Is > there some FOSS which will do it? > > Thanks, > Ben > http://vterrain.org/ > > > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking > _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
