Hi Rich, You can use the -o flag in d.rast in order to draw on the previous map. Of course, you still have to make sure that you have a region enough big for displaying everything. r.info should give you the minimum and maximum coordinates for each raster separately.
I don't know if it is what you were looking for... Christian On 13 janv. 2010, at 18:53, Rich Shepard wrote: > What I expected to be simple is eluding me. > > Using r.in.gdal I've imported 10m DEM maps for the NE, SE, and SW > quadrants of Oregon to augment the already imported NW quadrant. Now, > however, I'm having difficulties displaying all four simultaneously to make > sure they edge match and cover the entire state. This happens with both the > GUI and the command line. > > I can display only one at a time. It must be a WIND/region issue that I've > not correctly defined, and I don't see what I've missed. > > The rows, columns, and total cells for each map are: > > Quadrant Rows Columns Cells > NW 18724 24657 461677668 > NE 18856 24779 467232824 > SE 18680 24650 460462000 > SW 18732 24662 461968584 > > Using the highest pair of rows (37588) and highest pair of columns (49441) > I set g.region with those totals. The PROJ_UNITS are in feet so I also set > ewres and nsres to 3.048, but one setting overrides the other, so I elected > to go with the rows/columns. > > d.rast draws very slowly, and as soon as I repeat the command with a > different map the first is erased and replaced. > > What is the proper approach to defining a region to accommodate 4 DEM > quadrants? How do I display them all simultaneously on the monitor? > > Rich > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
