ORFEO Toolbox (OTB) is an open source library of image processing algorithms. OTB is based on the medical image processing library ITK and offers particular functionalities for remote sensing image processing in general and for high spatial resolution images in particular. Targeted algorithms for high resolution optical images (Pleiades, SPOT, QuickBird, WorldView, Landsat, Ikonos), hyperspectral sensors (Hyperion) or SAR (TerraSarX, ERS, Palsar) are available. OTB may make use of the following optional dependencies: mapnik (use MAPNIK=on) and opencv (use OPENCV=on). If the following packages are installed OTB will be built and linked against them: muParser, OpenSceneGraph and tinyxml. Otherwise, internal copies of the code will be used.