Frederick,<br><br>You can use GCPs you used to create the polynomials directly in gdal utilities to correct the deformed images.<br><br>I assume that your current images don't have any projection info.<br><br>1. First use gdal_translate with the -gcp option to create a dataset with your control points. You may also want to include the -a_srs option to add the projection of your control points. [1]<br>
<br>2. Then use gdalwarp to correct the image. gdalwarp uses the GCPs to warp the image. You may need to use the -geoloc option to force the use of GCPs and the -tps option to force the thin plate spline transformer. Set an appropriate resolution using -tr or -ts[2]<br>
<br>Let us know how it goes.<br><br>[1]: <a href="http://www.gdal.org/gdal_translate.html">http://www.gdal.org/gdal_translate.html</a><br>[2]: <a href="http://www.gdal.org/gdalwarp.html">http://www.gdal.org/gdalwarp.html</a><br>
<br><div class="gmail_quote">On Wed, Jun 15, 2011 at 3:29 AM, frederick keusch <span dir="ltr"><<a href="mailto:frederick.keusch@digimapas.cl">frederick.keusch@digimapas.cl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi,<br>
<br>
i would like to use gdalwarp to solve a problem we have. Like i am a very<br>
new user of gdal I don't know, if gdalwarp really can solve the problem, but<br>
I hope so. The problem that we have are a kind of "disformed" images in its<br>
positions. The images have several shifts in various directions. But we<br>
found a mathematical way to solve this problem applying a polynom with<br>
various parameters. But like there are too many images with the problem, we<br>
would like to use a program to apply that polynom to all of the images<br>
respectively to their coordinates.<br>
<br>
Our idea was to use the gdalwarp to solve this problem and apply a<br>
reprojection using e.g. something like this example formula giving from<br>
gdal...<br>
-t_srs '+proj=utm +zone=11 +datum=WGS84' raw_spot.tif utm11.tif<br>
.... and inserting the polynom in some way.<br>
<br>
Does somebody know, if it is posible to solve this problem with gdalwarp and<br>
if, how and where to insert the poynom?<br>
<br>
I appreciate your help,<br>
<br>
thanks a lot,<br>
<br>
Frederick<br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9494447584<br>17.2416N 80.1426E<br>