[GRASSLIST:3679] Scattergram; r.in.gdal

[pa paras]

Hi all. Is there any command to generate a scattergram of
two rasters? I have read the command list but can't find
a direct way to do that. Is there any other indirect way
to build a scattergram?

I read the emails about r.in.gdal errors sent to the list
the last week. I am also running into problems trying to
import tiff files with a .tfw description file into an
existing location. I generated a location using the UTM
projection larger than my tiff image. Then r.in.gdal doesn't
import the tiff file using the info stored in the .tfw
file and assigns the rows-cols values to the image borders.
I must then fiddle with the border coordinates using r.support.
I was wondering if I'm doing something wrong, because I
expected r.in.gdal to get projection info from the current
region/location and image coordinates from the multiband
tiff/.tfw file (?).

Any comment would be appreciated.

Thanks in advance,
John





>From: Glynn Clements <glynn.clements at virgin.net>
>To: GRASSLIST at baylor.edu
>Subject: [GRASSLIST:3670] Re: r.in.gdal error
>Date: Wed, 15 May 2002 15:29:16 +0100
>
>
>Russell Nelson wrote:
>
> > > Dear Grass users,
> > >                  I am using grass5.0.0pre2 and gdal-1.1.5. I want to
> > > import ERDAS (.img) raster file into my lat-long Location .When I use
> > > r.in.gdal to import ERDAS (.img) raster file, it gives the fillowing 
>ERROR
> > > It work fine with X-Y Location but I want to import in lat-lon 
>location.
> >
> > Anil, please do NOT take my answer for authoritative since I have only
> > been using grass for a few weeks.  However, from what I've been able
> > to tell, the proper procedure for importing a raster without
> > georeferencing information is to create two locations: one lat/lon and
> > the other X-Y.  r.in.whatever the raster into the X-Y location, add it
> > to an i.group, set the i.target for the raster to be the lat-lon
> > location, i.rectify the raster into lat/lon, g.region
> > rast=YOUR-RASTER, and d.rast map=YOUR-RASTER .
>
>i.rectify should only be necessary if the raster isn't in a known
>projection (e.g. aerial photographs), or if you are unable to
>determine the raster's projection.
>
>For a raster which is already in a known projection, you can just
>import it into a location with the same projection, then use r.support
>to specify the raster's boundaries.
>
>If you wish to use a different projection for analysis, first import
>the raster into a location whose projection matches that of the
>raster, then use r.proj to re-project it into the destination location.
>
>--
>Glynn Clements <glynn.clements at virgin.net>
>




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