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<div class="moz-cite-prefix">On 16/08/2012 22:09, Janet Choate
wrote:<br>
</div>
<blockquote
cite="mid:CAEqw1VxRV4KS+uji0ut2RB8ox_R8K-a9mqPND95ok48OQsjW+w@mail.gmail.com"
type="cite">Hi all,
<div>i have a raster that i simply want to split in two along a
line designated by me, thereby creating two separate rasters. i
have attempted to digitize using v.digit, displaying the raster
and drawing a line around the area of interest. i go through
the motions of what i think is closing the line, then save and
exit. but <a moz-do-not-send="true" href="http://v.info">v.info</a>
shows no data attached to this new vector, and when i try to
display, nothing shows up. </div>
<div><br>
</div>
<div>can anyone tell me how to make 2 rasters out of my 1 along a
user specified line, or how to successfully digitize this?</div>
</blockquote>
<br>
I think the easiest would be to set your region, temporarily, to
cover just the area of interest up to the cut line. THen do
r.mapcalc new_rast=old_rast. Now, if necessary go back to the old
region.<br>
<br>
g.region save=original_region<br>
g.region -p n=... s=... e=... w=... # set up to the cut line<br>
r.mapcalc new_rast=old_rast<br>
g.region region=original_region<br>
<br>
If the area of interest is not rectangulalr, then follow L.Previtt's
suggestion.<br>
<br>
<blockquote
cite="mid:CAEqw1VxRV4KS+uji0ut2RB8ox_R8K-a9mqPND95ok48OQsjW+w@mail.gmail.com"
type="cite">
<div>thank you,</div>
<div>Janet</div>
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</blockquote>
<font size="+1"></font><br>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
052-3665918
</pre>
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