GDAL and PKTOOLS are powerful commands line utilities mainly used for raster manipulation and analysis. In this workshop, we will explain the main principle and philosophy about these tools by showing simple geodata processing for raster cropping and re-projection, image masking, spatial and temporal/spectral filtering as well as image classification. We will explain how to maximize computational implementation and process raster data more efficiently by building up routines that allow to save temporary rasters outputs in the RAM and use VRT files for tiling operation in a multicore environment. We expect basic command line knowledge (any language is fine) and a general knowhow of geospatial data processing. Participants should bring laptops with 30G and we will assist them in installing the OSGeo-Live virtual machine.