The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLII-3/W10
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W10, 289–296, 2020
https://doi.org/10.5194/isprs-archives-XLII-3-W10-289-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W10, 289–296, 2020
https://doi.org/10.5194/isprs-archives-XLII-3-W10-289-2020

  07 Feb 2020

07 Feb 2020

STUDY ON ACCURACY ASSESSMENT OF DEM IN THE MARSH USING WITH INTERFEROMETRIC PALSAR, SENTINEL-1A AND TERRASAR-X IMAGES

B. L. Fu1,2, Y. Li3, E. T. Gao1,2, D. L. Fan1,2, and P. Q. Lou1,2 B. L. Fu et al.
  • 1College of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004, China
  • 2Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin 541004, China
  • 3Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

Keywords: Marsh, DEM, InSAR technique, Accuracy validation, Interferometric coherence difference

Abstract. To conserve and manage wetland resources, it is important to monitor hydro-geomorphic condition. In this paper, the interferometric SAR images of L-band ALOS-1 PALSAR, C-band Sentinel-1A and X-band TerraSAR were selected to produce DEM of wetland area in the Honghe National Nature Reserve using the InSAR technique. 111 testing points randomly selected from the 1:10000 topographic map were utilized to evaluate accuracy of remote-sensing based DEM. Finally, the interference coherence difference of wetland vegetation among three different wavelengths was compared and analyzed. The results showed that The DEM of wetland area produced by L-band ALOS-1 PALSAR interferometric images was in good agreement with the 1:10,000 topographic map data. The elevation value with the difference less than 3 meters account for over 76% of all testing points. The coherence coefficient of wetland calculated from PALSAR images was higher than Sentinel-1A and TerraSAR images. The coherence coefficient among wetland vegetation types was significantly different. The distribution area of forest and shrub-grass vegetation had a larger coherence coefficient than shallow-water marsh vegetation area and deep-water marsh vegetation area.