> > ------------------------------ > > Message: 4 > Date: Sun, 9 Nov 2008 21:56:31 +1100 > From: "Matt B" <[EMAIL PROTECTED]> > Subject: [GRASS-user] Help with Georeferencing > To: [email protected] > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Group, > I'm slowly figuring out how to use grass but encountering the odd problem. > Actually, I haven't managed to get much done with grass at all yet but I'm > writing that off to the learning curve. > At the moment I'm trying to georectify a stitched together google earth > image (I'm aware of the various legal issues that go with this and I'm just > using a few images to see if the work I want to do is feasible with this > type of data, if it is I'll look at purchasing data). > > I've imported the raster into grass using gdal, it splits it up into 3 (RGB) > files? and I can display it (in the wrong place at the wrong scale). I also > have the coordinates of the 4 corner points of the image and those are what > I'm using to georeference using the georeferencing tool from the file menu. > > I keep getting this error when I hit the "georectify" button in the > georeferencing tool: > > Traceback (most recent call last): > File "/usr/lib/grass/etc/wxpython/gui_modules/georect.py", line 825, in > OnGeorect > self.SaveGCPs() > TypeError: SaveGCPs() takes exactly 2 arguments (1 given) > Traceback (most recent call last): > File "/usr/lib/grass/etc/wxpython/gui_modules/georect.py", line 825, in > OnGeorect > self.SaveGCPs() > TypeError: SaveGCPs() takes exactly 2 arguments (1 given) > > (python:11374): Gdk-CRITICAL **: gdk_window_set_geometry_hints: assertion > `GDK_IS_WINDOW (window)' failed > > GRASS_INFO_MESSAGE(12418,1): Group <morondavaGE> has no target > GRASS_INFO_END(12418,1) > > > It also took me a while to figure out how to set up image groups. I'm still > not sure if I've got that correct but that doesn't look like what the > problem is. > I am able to get the image aligned in qgis but stage 2 of my work will > involve some simple image classification (no doubt the subject of the next > few emails to this list). I'd also like to be able to know enough about how > grass works to be able to use it properly so I'm persevering with grass for > the time being. > > Thanks > Matt > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.osgeo.org/pipermail/grass-user/attachments/20081109/98a18a33/attachment-0001.html > > ------------------------------
Matt, I realise that Hamish and others have already offered some input here, but here's another 2c worth. Although there's a "single click" interface for georeferencing, I still find it works better if I follow the step-by-step process. - i.group at the command line, to create a map group - i.target at the command line, to point your group "towards" the place where you want the georeferenced image to end up - d.mon start=x0 to get an x-monitor up and running - i.points <group> to start working. Second thought. If you're not seeking super-high quality, use r.composite to combine your three images into one. Richard Chirgwin _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
