[GRASS-user] Displaying Multiple Adjacent Raster Maps

Christian Kaiser Christian.Kaiser at unil.ch
Wed Jan 13 13:07:54 EST 2010

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...


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
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