==== Ressource web ====
http://www.bostongis.com/PrinterFriendly.aspx?content_name=ogr_cheatsheet
http://casoilresource.lawr.ucdavis.edu/drupal/node/98
=== Transformation de rasters avec gdal_translate ===
http://linfiniti.com/2009/12/batch-convert-a-directory-of-tiffs-to-ecw/