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I am working on a Modis - oceancolor image and I want to reproject it to wgs84. I have the Upper left/right and Low left/right values from the metadata of the image and I want to add them all in the command line of gdal_translate or gdal_warp. But in these two commands I can only add the Upper Left and Low Right lan/long (x,y).

Do you have any idea how can I add all the corners of the image in the script?

Thank you!

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I am not sure I understand your question. If you enter the values, the algorithm will do the math to find all corners. If you are looking to find each corner value I find drawing a square on paper and writing out the values work. For example, if you start in the lower left and work clockwise you would have the following: 0,0; 0,1; 1,1; 1,0. If you enter the lower left X/Y (llxy) and the upper right x/y (urxy), it will be the same as the upper left x/y (ulxy) and the lower right x/y (lrxy). Using this schema gives you all the values you need to do the transformation (not needing 4 corners) – Ryan Garnett Nov 1 '12 at 3:02
Yes of course! The problem in the image I am now working on is that the corners from lower left and clockwise are the following: 1,1; 0.5,4; 3,6; 4,3. That's why I need to add all the 4 corners... Ul(x,y) and Lr(x,y) are not enough. – Vilen Nov 1 '12 at 8:23
Would gdal_translate work, with the -a_srs and -a_ullr? I have used this successfully for similar problems. If that is not what you need, you may consider georectifying it. I know you posted that you would like to do this in a commandline application. – Ryan Garnett Nov 1 '12 at 13:34
This is exactly what I did but I still need to use as gcp points the other two corners. The story is that I am trying to apply an automatic command line application for this action. Still searching... – Vilen Nov 1 '12 at 14:46

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