摘要：A numerical study comparing the performance of surface water-flow simulations when using two different digital elevation models (DEM) is presented. The study was carried out over a 10,000 km2 plain region of the Buenos Aires Province in Argentina. The first DEM was generated using the Triangular Irregular Network (TIN) technique to interpolate from cartography at 1:50,000 scale. The other DEM was constructed by means of interferometric processing from a pair of tandem SAR images. In both cases 20m-size pixels were used. At large scale the general shape of the two models are similar. However, at lower scales the interferometric model shows far more details, like roads sides and local depressions. These low-scale details play a crucial role in surface flow simulation in very flat regions.
其他摘要：A numerical study comparing the performance of surface water-flow simulations when using two different digital elevation models (DEM) is presented. The study was carried out over a 10,000 km2 plain region of the Buenos Aires Province in Argentina. The first DEM was generated using the Triangular Irregular Network (TIN) technique to interpolate from cartography at 1:50,000 scale. The other DEM was constructed by means of interferometric processing from a pair of tandem SAR images. In both cases 20m-size pixels were used. At large scale the general shape of the two models are similar. However, at lower scales the interferometric model shows far more details, like roads sides and local depressions. These low-scale details play a crucial role in surface flow simulation in very flat regions.
