Frederick,<br><br>GCP is a control point. Ground Control Point. They are not visible in the image. Just a map of pixel-line to coordinates.<br><br>I am not familiar with how the warping algorithm handles the GCPs. But if you want, you can also set the projection info after you use your own method to correct the deformities in the images. You will have to apply the 'modified' GCPs.<br>
<br><div class="gmail_quote">On Wed, Jun 15, 2011 at 7:17 PM, 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 Chaitanya,<br>
<br>
first of all I'd like to thank you for the information.<br>
<br>
So if I understood you correctly, it is not necesseary to use the polynomial<br>
we calculated but only a dataset of the control points we used and<br>
gdal_transalate calculates a polynomial internally. Do you know how exactly<br>
this internally polynomial will be, because the one we calcualted is of 24th<br>
orden. Do you also know if it is necessary that the control points are GCP's<br>
or in oher words visible in the images, because what has our departement of<br>
navegation is a list of control points, but not visibles in the images.<br>
<br>
Also our current images do have a projection and in the result we want them<br>
in the same projection but corrected in their positions. But I think this<br>
should not matter....<br>
<br>
Again I'd like to thank you for your corporation,<br>
<br>
Frederick<br>
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</div></div></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>