Dear List,

My area of interest is unfortunately split between two Landsat
scenes.  We have in the past had them mosaiced and rectified by
an outside agency, but now that I'm comfy with GRASS I'd like 
to do as much of this as possible myself and cut out the middle
people.

Our images are North and South of each other and to this point
we have never seen 'original' data in the standard TM format,
just the mosaiced and rectified data the outside agency sends
us in a 7-band DISIMP image format (which we then convert
to 7 GRASS raster files).  So I speak from ignorance when I
say...

I assume that in the original data that the outside agency
obtains there is some overlap between the North and South scene,
and that this forms the basis for co-registering and rectifying
part of the two images to do the 'mosaicing' (??).

I therefore guess that the part of the GRASS image-processing 
tutorial dealing with patching unrectified cell files will be
the appropriate one to apply (i.e. using r.patch).  

Rectifying the data seems straightforward enough.  Can somebody
comment on my assumptions about mosaicing in GRASS before I do 
something that will have me wearing the 'LAB IDIOT' sign? :-)

Cheers, Peter Briggs
-- 
School of Earth Sciences    email: pbriggs@laurel.ocs.mq.edu.au
Macquarie University        phone: +61 2 805 8356
NSW 2109, Australia         fax  : +61 2 805 8428


