On Dec 9, 2009, at 5:11 PM, Andy Pugh wrote: >> It would be steering a vehicle to keep it in close as possible to a >> vector of travel based on differential GPS signals. >> >> It would be used for gradiometer data collection for archeology. The >> more accurate the grid is sampled, the better. > > That sound like fun. Not many people get to use G-code dimensions in > feet.
Definitely - puts a smile on my face just thinking about it. > Bear in mind that it doesn't matter that much where you are, just that > you know where you are. As long as each reading has an accurate > coordinate, then it is good data. > You can always regularise your grid later with a Delaunay > triangulation and bilinear intepolation. (I have code). Or use the > Matlab "griddata" command. Yes, we have been creating grids using "Inverse Distance Squared Weighting" and "Regularized Spline with Tension" using GRASS GIS. I am not sure why, but the archeologist I have been working with thinks that the closer the data is collected in a grid, the better. I think it might have to do with using arrays of sensors spaced closely together. Regardless, he has to drive repeatedly up, down, in straight lines so it would make his job much much easier. Ultimately, it would be cool to make a robot do all the driving, and we see this as a big step in that direction. > Look on eBay for old laptops. It seems that older ones tend to have > fewer problems, and parallel ports. You could probably speculatively > buy several, pick the best and sell the rest back for not a huge loss. Thanks. > I recall reading a paper a long time ago that suggested that a fractal > was a better way to scan an area than a standard raster. long-term > systemic variations get averaged out better. (though the application > was electron microscope scan patterns) Hmmm, that would make for some very interesting scanning patterns! Would probably look like a drunk driver! > (Back on subject) EMC actually seems quite a reasonable fit for this > job. Cool, thanks for the tip. Best, Jeshua Lacock Founder/Programmer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Return on Information: Google Enterprise Search pays you back Get the facts. http://p.sf.net/sfu/google-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
