On Tue, Mar 8, 2011 at 10:45 AM, Hamish <hamis...@yahoo.com> wrote: > Chethan wrote: >> When I try to mosaic landsat images(just one band) which >> belong to adjacent >> path-rows they do not mosaic properly. It appears as in the >> attached >> screenshot. I have tried changing the order of images but >> just the >> overlapping image changed. I have tried r.patch as well as >> i.image.mosaic >> with region encompassing both the scenes. However if I >> mosaic the same >> images in ERDAS Imagine there are no issues. Mosaiced >> image will be simply >> perfect except for brightness differences. ERDAS also >> provides options like >> histogram matching to sort out such issues. So what is the >> way to mosaic >> images in GRASS? Also is there any way to use specify >> options like >> resampling, histogram matching in the process? > ... >> http://osgeo-org.1803224.n2.nabble.com/file/n6108043/mosaic.png > > [sorry about yahoo's linewrap] > > > the d.what.rast or the query tool to check to see if the black image > boundaries are in fact NULL, or if they are 0. If they are 0 use the > r.null module to set them to NULL, then try again.
As an alternative, you can use r.clump2 from GRASS-Addons and flood-fill areas (here, the "black" boundary" using the coordinate parameter. Markus _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
