Adrian Lester wrote: > Please excuse my newbiness. I have been reading documentation left, right > and centre and I may be missing something but I can't find an obvious way > to do this. > > I have a set of high resolution digital maps (currently a matrix of about > 200x400, each at 1280x1024 resolution). They are saved as GIF files, > though that could be changed, and I know their centre and edge positions > in terms of Lat/Long to a negligible error. These data are stored in a > tab-delimited text file. The map fragments are in a transverse mercator > projection though not UTM. They are plain image files with no geographic > data geocoded into the format. > > What I want to do is to import them automatically via shell-scripted > commands to a Grass raster layer(s?) in order to cover the region over > which they spread, so that within grass I can work with it as a contiguous > area. > > I have found information about importing scanned maps with graphical > picking of corners but this is both far too time consuming and unnecessary > for what I am attempting (the maps are 'square', not scanned, and I can > provide their edge positions automatically). I have also found some > indications that each raster image has to end up as its own layer... how > does this work with groups, large numbers of map fragments etc? Do I have > to join the raster images within Grass or can they be kept separate? > > If someone could point me in the right direction in terms of which > commands I need to use and whether this is possible, I'd be very grateful. > I'm really looking forward to getting this lot into Grass so that I can > start working with it and learning more!
To set the bounds of the imported maps, use r.region. To merge multiple maps, use r.patch. If the images don't share a common colour table (palette), you will probably need to recode them first. -- Glynn Clements <[EMAIL PROTECTED]> _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
