The goal of the SIG Forestry is to set up a platform for co-operation and information exchange among people interested in development of forest mapping methods, assessment of biophysical parameters, monitoring of the human and natural impacts (insects, wind), change detection, etc. Imagery from a range of EO sensors (VHRS optical, hyperspectral, lidar, radar, digital aerial photographs) are utilised in both research and application oriented projects. The results are periodically presented in SIG workshops, which are often organised in co-operation with similar groups within IUFRO and ISPRS. The SIG topics are also presented within the annual EARSeL Symposium. Other activities include searching for joint project funding, arranging free sensor datasets, or ground truth reference data for algorithm testing.