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DEM extraction for an orthorectification of radarsat-2 image

Good morning.

I'm a student who is using Geomatica 2012 Orthoengine for an  orthorectification of Radarsat-2 images. These are images of February, 06 2009; February, 23 2009; October, 09 2010 for Cotonou City, Benin.

I got this error "no overlap between the image and your DEM".

Can anyone help me for having a good method for DEM extraction.

Thanks in advance.

André ASSE

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