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What about create a difference raster?<br>
you can do with <br>
<i>r.mapcalc diff=rast1-rast2<br>
</i>So you can see in a moment where difference are.....<br>
<br>
dylan wrote:<br>
<blockquote type="cite" cite="midBC791899.BC43%25dylan@iici.no-ip.org">
<pre wrap="">hello,
i have 2 raster images that i would like to compare numerically. for the
time being, a simple linear regression would suffice.
these rasters are basically 84 selected points from a much larger raster
image - therefore there should only be 84 pixels that are not NODATA.
i have tried dumping the rasters as ascii, removing the NODATA values, and
setting up a table as follows:
raster1_values | raster2_values
-------------------------------
v1 | v1
v2 | v2
... | ...
however, when i plot the values i am getting very unusual results. it could
be that my plots are valid, but could i be doing something strange here?
thanks in advance,
Dylan
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</blockquote>
<br>
<pre class="moz-signature" cols="50">--
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note: change my e-mail reference to <a class="moz-txt-link-abbreviated" href="mailto:massimiliano.cannata@supsi.ch">massimiliano.cannata@supsi.ch</a>
because the old one will be deleted soon.
-------------
Ing. Massimiliano Cannata
Istituto di Scienze della Terra - SUPSI
C.P. 72 - CH-6952 Canobbio (Ticino, Switzerland)
Tel +41 91 /935 12 25 - Fax +41 91 /935 12 09
eMail: <a class="moz-txt-link-abbreviated" href="mailto:massimiliano.cannata@supsi.ch">massimiliano.cannata@supsi.ch</a>
Internet: <a class="moz-txt-link-freetext" href="http://www.ist.supsi.ch">http://www.ist.supsi.ch</a>
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