Rosenkranz, Brigitte Christine pisze:
I just started using Q-Gis and I have problems with using the color
maps for my raster layers. I have a huge amount of ASCI grid raster
files (elevation data from Danmark) and I try to open as much
files/layers as possible at once. It seems like per default the
chosen color map is greyscale. I would like to open my files in a
customer defined colormap. I would also like to define the customer
color map in a different way then it is default. Because I have a
huge amount of files it is very unconvenient to open the properties
for each layer.
Now my question is comming d:o) Is there any possibility to define
these settings for all raster layers at once? So that I don't have to
klick 9000 times for having the same colours in all my layers?
I assume you mean ArcInfo ASCII grids (AAIGrid in GDAL lingo) and they
have a uniform extension (say *.asc).
If using GRASS GIS on a GNU/Linux box is an option for you, you might do
the following:
0. Setup a location with coordinate system matching your grids.
1. Import all AAIGrid into GRASS (consider using flag -o in r.in.gdal,
if your grids have a malformed prj or don't have it at all):
for i in *.asc; do r.in.gdal in=$i out=`basename $i`; done
2. Assign same colortable to all grids (refer to r.color manual for
available colortables):
for i in `g.mlist type=rast patt=*`; do r.colors rast=$i
color=any_you_like; done
3. Export grids. The colortables will be stored in xml files which QGIS
(via GDAL) understands. Refer to r.out.gdal manual to choose a correct
data type. As a bonus each AAIGrid will have a valid prj file (if you
make step 0 right):
for i in `g.mlist type=rast patt=*`; g.region rast=$i -a; r.out.gdal
in=$i out=$i.asc format=AAIGrid type=your_data_type; done
You might consider exporting to a different format.
Maciek
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