In April / May 2009 DHI-WASY realised the second field campaign in the survey area in Tam Nong. The objective of this trip was mainly to do terrestrial surveying of dams and dikes alongside surface channel systems. This was realised with a satellite supported survey system with a mobile GPS receiver and a base station. The result is high resolution data for ground level elevations, especially for geographical breaklines like dams & dikes and roads of different categories. The data will be used for DEM generation and validation of DEM´s generated from remote sensing data.