[GRASS-user] raster data to ascii
glynn at gclements.plus.com
Fri Jun 13 23:37:28 EDT 2008
Martina Schaefer wrote:
> thanks for your answer to my raster/ascii questions and sorry for the
> late replay, I had to move to something else for a moment (deadline for
> corrections to a paper) and then I was a bit playing around with the
> commands you showed me.
> g.region followed by r.stats or r.out.ascii does indeed what I was
> looking for, but in my Map Display window is still written the old
> resolution and I think the map is also drawn with the old resolution. Is
> there a possibility to do these?
The GUI has its own set of region settings, so you need to change the
region from within the GUI to affect how a map is displayed within the
Or you can explicitly resample the map with r.resamp, r.resamp.interp,
or r.resamp.stats, then display the resampled map in the GUI.
> In fact, the simple resampling with the nearest-neighbour is probably
> not good enough, so I was trying r.surf.idw as I can't make your
> commands r.resamp work,
Which version of GRASS are you using? r.resamp.interp and
r.resamp.stats aren't present in 6.2.3, only in 6.3.x.
> and I would like to visualize my interpolation
> without each time exporting to ascii and visualizing with another program!
You can view the resampled maps in the GUI, or with d.rast.
> Is there also a possibility to save the data with the new resolution, so
> that I don't have to do it each time?
Explicitly resampling the data will create a new map.
> And, one last question, I have three sets of raster data of the same
> region (ice thickness, bedrock and surface elevation of a glacier). How
> can I get them into the same grass LOCATION? I would like to have access
> to them at the same time and also make some simple operations like for
> example the difference of two of the datasets!
Data is normally imported into the current location, unless you
explicitly import into a new location with e.g. r.in.gdal's location=
If the rasters have different projections, you will need to import
each one into a separate location, then switch to the target location
and re-project the data with r.proj.
Glynn Clements <glynn at gclements.plus.com>
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