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<font size=3>Frank,<br><br>
Thanks for the prompt reply.<br>
Up to 3rd order polynomial warp is fine for my application.<br><br>
I'll take a look at gdalwarptest.<br><br>
I have a few more questions now:<br><br>
1. How can GCPs be supplied? Is there a write up on it?<br>
2. How many GCPs can be provided?<br>
3. Does the image need to be raw or will it work with .tif too?<br>
4. Earlier write up on gdalwarp mentioned that it supported<br>
nearest neighbour resampling only. Does it
support bilinear<br>
or any other methods now?<br><br>
Thanks,<br><br>
Reinaldo<br><br>
At 23:30 18-09-03 -0400, you wrote:<br>
<blockquote type=cite class=cite cite>Reinaldo Escada Chohfi wrote:<br>
<blockquote type=cite class=cite cite>Hi GDAL Users,<br>
I am planning to use the gdalwarp utility to<br>
geo-reference a number of images in batch.<br>
I would like to know before hand if it can be<br>
utilized to warp (rectify) unprojected images.<br>
That is, can it input raw images with GCPs<br>
and output geo-referenced rectified (warped)<br>
Geotiff images, given that it is also provided<br>
proj, zone, ellps, etc?<br>
Or it can only be used to reproject and warp<br>
images that have already been rectified and are<br>
geometrically correct in a particular projection?</blockquote><br>
Reinaldo,<br><br>
First, I would advise you to use gdalwarptest, the new generation<br>
warper.<br><br>
Second, yes, it can rectify raw images, but it can be a bit tricky<br>
currently to supply the GCPs. Also, currently only polynomial
warps<br>
are supported when operating from GCPs, and only up to 3rd
order.<br><br>
Best regards,<br>
-- <br>
---------------------------------------+--------------------------------------<br>
I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam@pobox.com<br>
light and sound - activate the windows |
<a href="http://pobox.com/~warmerdam" eudora="autourl">http://pobox.com/~warmerdam</a><br>
and watch the world go round - Rush | Geospatial
Programmer for Rent<br><br>
<br>
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