Abstract:

Based on multi-temporal Landsat Remote Sensing imaging, a synthetic method suitable for extracting Baiyangdian Wetland was used. Considering the wetland range as the submerged area, and its boundary line is regarded as the contour line of the surface water level. According to remote sensing images, elevation control points, the regions affected by human activities in wetlands are adjusted, and the Digital Elevation Model (DEM) of the Baiyangdian Wetland is generated by interpolation. Through verifying the remote sensing images and ground elevation control points, the DEM accuracy is estimated to be over 80%, and the verifying error of the ground control point (-0.5 m to 0.5 m) reaches 80%. The DEM extraction from a series of remote sensing images can make up the defects of insufficient digital elevation information in the Baiyangdian Wetland. This study is important to improve the water balance calculation of the Baiyangdian wetland and the accuracy of the coupled model between the lake and groundwater.

Key words: Landsat image, Baiyangdian wetland, submerged area, contour line, Digital Elevation Model