Yeah, that might be an excellent technical solution, but on-screen
digitizing sounds so retro compared to the kewlness factor of walking
the property and capturing locations using a
home-made-high-accuracy-GPS-system. ;) ;)
Daniel
Paul Ramsey wrote:
Sounds like a combination of Stephen's aerial mapping approach and your
GPS approach would work like a hot damn.
- Take your cheap GPS receivers out and gather an hours worth of data at
two ground control points preferably on opposite sides of your
property. Even better, take a couple GPS receivers out. Average
everything out to get your "best known location for those two points".
- Now take some aerial data (perhaps the USGS or the USDA aerials?) and
affine it into place using your control point.
- On-screen digitize the features of interest, and you're done. The
aerials provide the relative positioning accuracy and the control points
provide the absolute global positioning accuracy.
P.
On 6-Aug-07, at 12:47 AM, Ben Discoe wrote:
Great! I've got several parcels of land, each several acres, with
lots of features in them (fences, trees, buildings, etc.) I need to
digitize the location of the boundaries and features, and some
sloppiness is acceptable (1-2m) as this isn't legal or proper survey
work. 3D surface height would be super, but i know that's impossible,
so 2D points is fine. I'm happy to pay prosumer prices (<$1000) but
the typical cost of pro gear (>$8000) is right out.
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Daniel Morissette
http://www.mapgears.com/
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