<br><font size=2 face="sans-serif">I started using the display to set the
target region and g.region to set the resolution. I also run the
georeferencing rutine at low resolution first to more accuratly determine
the target area and then run at higher resolution for the final product.
The whole process (setting GCPs and running at different resolutions)
takes about an hour per aerial photo, which is acceptable. The quality
of the final image is very close to that of the source image.</font>
<br>
<br><font size=2 face="sans-serif">Thanks to everyone for their help.</font>
<br>
<br><font size=2 face="sans-serif">Luis E. Menoyo<br>
U.S. Geological Survey<br>
677 Ala Moana Blvd., Suite 415<br>
Honolulu, HI 96813<br>
lemenoyo@usgs.gov<br>
808-587-2428</font>
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<td width=40%><font size=1 face="sans-serif"><b>Hamish <hamish_b@yahoo.com></b>
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<p><font size=1 face="sans-serif">01/22/08 03:14 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">Luis E Menoyo <lemenoyo@usgs.gov>,
grass-user@lists.osgeo.org</font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [GRASS-user] i.rectify - how long
is too long</font></table>
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<br><tt><font size=2>Luis E Menoyo wrote:<br>
> It looks like i.rectify processes the complete target area instead
of<br>
> just the image area to be rectified.<br>
<br>
<br>
tip: use v.in.region + v.proj to set up target region / resolution<br>
prior to using r.proj or i.rectify.<br>
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<br>
Hamish<br>
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