Hey Tim, If your maps don't overlap with each other you could use r.series in your case :
$ g.region rast=$(g.mlist rast sep=",") $ r.series input=$(g.mlist rast sep=",") out=myMap method=sum N On Mon, May 19, 2014 at 11:31 AM, Tim Southern <[email protected]> wrote: > Dear All, > > I am trying to patch together a number of 1 km by 1 km tiles of a map whose > values are either 0 or 1 (black on white background). > > If I use r.patch to put 2 tiles together is appears to work fine but if > however I try and patch more, even if it is two tiles of already patched > tiles I get one set when patched as black background and white features and > the other part as white background and black features. It appears that the > second in the case of already patched data or third and subsequent in case of > more than 2 tiles is inverted with 1 becoming 0 and 0 becoming 1. > > I have tried reducing region to the smallest. Maps are at 0.2m resolution. > I am hoping to get a 5 tile by 5 tile block > > I have tried this across two different platforms (Mac OS and OpenSuse ) on > the latest downloadable binary versions of GRASS. > > Am I doing something wrong? > > Kind regards > > Tim > Tim Southern > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
