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GRAP is a library dedicate to the processing of spatial raster datas. Several types are supported such as Esri Ascii grid and PNG, TIFF or BMP images with their corresponding world file.

GRAP is based on ImageJ library. Beyond the control of spatial metadata, it provides the ability to process several images using just a few amount of memory. GRAP includes also a lot of algorithms such as slopes computing on a DEM, watersheds retrieval.