Thanks to all for your help,
your were right. The Region was apparently not large enough to show my map.
g.region rast=myMap solved the problem.
Richard
-----Ursprungliche Nachricht-----
Von: Ian MacMillan [mailto:ian_macmillan@umail.ucsb.edu]
Gesendet: Dienstag, 26. Oktober 2004 21:09
An: Praktikant
Cc: GRASSLIST@baylor.edu
Betreff: Re: [GRASSLIST:4640]
Richard,
You are getting a white rectangle because your region is not set to
look at the colored portions of your raster. Sounds like you imported
a non-georeferenced map into GRASS. If you imported this into an XY
location, then you will have to set your region to your map with
g.region rast=yourmap. If you imported this directly into a region
with georeferencing (like a UTM location), then your map will be
hanging out somewhere around the coordinates 0,0 (since jpg's are not
georeferenced). If you know the bounding coordinates of your image,
you can input that into r.support, then set your region (g.region
rast=yourmap), and d.rast to view it. If you don't know the
coordinates, then import your raster into an XY location, then
georectify it by using i.group, i.target, i.points, i.rectify.
Hope this helps,
-Ian
On Oct 26, 2004, at 12:25 AM, Praktikant wrote:
Hello List,
I would like to have an topographic map as "background" on my monitor
but I
failed.
I imported a jpg using r.in.gdal resulting in RGB band files
example.red,
example.blue, example.green.
When i want to check these files a white recangle in the size of the
file is
shown (I would expect a red green and blue map instead so something
should
be wrong in this stage already).
After that i created the statistics for the rgb-files with r.support
-r and
created a color composite image from the three band files with
i.composite.
d.rast map=example resulted in a black rectangle in the size of the
file.
What was wrong in this process and how can I simply show a scanned map
on my
screen?
Thanks in advance for your help.
Richard