terrestris has been offered another opportunity to present at FOSS4G 2009 in Sydney, which we are happy to accept. On Wednesday, October 21st, from 1:30 PM to 2:00 PM, we will present the work carried out on behalf of the Jülich Research Center regarding the Terrestrial Environmental Observatories (TERENO). This involves the visualization and spatial interpolation of environmental measurement data in an open source WebGIS.