Science Service System

Summary of Proposal HYD1731

TitleLong-term monitoring of lakes in the northern central European lowlands in Germany and Poland
Investigator Heine (nee Kleine), Iris - GFZ, German Research Centre For Geosciences, Section 1.4 Remote Sensing
Team MemberNo team members defined
SummaryWith the help of ascending and descending high-resolution TerraSAR-X SM data, we will monitor the water surface areas of various lakes located within the lowlands of Northeast Germany and Poland. The main study area is around the German city Neustrelitz. The study includes a long-term monitoring and the analysis of the time series of lake shore lines from 1991 to 2011 via SAR imagery. For the time since 2007 we will use high resolution TSX SM data to monitor water surface areas of lakes several times a year. The analysis of seasonal variations of the water surface areas is important of the understanding of the hydrological year and for the understanding of long-term water surface area changes. Large incidence angles and single HH polarization are preferred for water detection, but the use of various incidence angles and single VV and dual polarizations will be tested as well. Ascending and descending mode will be used supplementary to avoid inaccuracies in the detection of the water surface areas due to geometric effects. The water surface areas will be connected to water level data which were continuously measured at selected lakes. Our investigations are part of the joint ICLEA project (Integrated Climate and Landscape Evolution Analyses), which is funded by the Helmholtz Association of German Research Centres Initiative - Networking Fund for funding a Helmholtz Virtual Institute.
Detailed reportThe study aimed to reconstruct time lines of the shorelines of a large number of lakes and a documentation of seasonal changes of the water surface areas based on SAR data to support the understanding of seasonal changes and long-term developments as well as prediction capabilities. However, first tests showed that vegetation at the shorelines (reed and overhanding trees) reduced the accuracy of the extracted shorelines massively so that the project was discarded. Instead another project was started, using polarimetric TSX data for the monitoring of reed (Proposal HYD2636).

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