SIG. ACT Planning and Land Authority. OGE - Ordre des Géomètres-Experts. Products. From Open Source Geospatial Fundation. OSSIM is a powerful suite of geospatial libraries and applications used to process imagery, maps, terrain, and vector data. The software has been under active development since 1996 and is deployed across a number of private, federal and civilian agencies. OSSIM Apps ¶ Command Line Applications - ossim-info, ossim-orthoigen, ossim-dem, ...