On Sat, Nov 27, 2010 at 12:23 PM, Jenny Turner <[email protected]> wrote: > Hi > > I'm using GRASS GIS 6.4.0 (stable version) in Windows (because my Univ made > a few addaptations and modules to be used in my final project) but I'm > having some difficulties in using Georectify tool. > > After I select 3 points, I press Recalculate RMS Error (and I get the image > that I have attached to the email). THis is impossible to have 0,0 as error > (in this case).
No, because the RMS errors will always be zero if the number of points is equal to the minimum number of points required for the selected order, here 3 points for first order. > POINTS file <D:\data\Area\scale\group\ai\POINTS> saved > But, then I press Georectify and It freezed all Interfaces and I got, in the > top of each one, (Not Responding)... I waited 10 minutes (it sould take less > than that). And still not responding... Ho long does georectification take if you use i.rectify directly from the source location/mapset? > > Another question: > If my source (to be georreferenced) data has a resolution of 10 meters and > my target (already georreferenced) as 30 meters resolution and my active > mapset is 10 meters.. Georreferenced output will have which spatial > resolution? > If you choose 'clip to computational region in target location', the computational region in the target location+mapset will be used. Otherwise i.rectify estimates the minimum target region required to hold the source image and estimates a resolution corresponding to the image resolution. Markus M _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
