测绘通报 ›› 2019, Vol. 0 ›› Issue (8): 135-139.doi: 10.13474/j.cnki.11-2246.2019.0268

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Extraction accuracy and stability analysis of different water body index models in GF-2 images

LIU Shuangtong1,2,3, WANG Mingxiao4, YANG Shuwen1,2, YANG Mingze3, YANG Lihua3   

  1. 1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Gansu Province, Lanzhou 730070, China;
    3. Lanzhou Precision Sand Table Model Intelligent Manufacturing Co., Ltd., Lanzhou 730020, China;
    4. Post-Doctor Research Center of 68029 Troops, Lanzhou 730020, China
  • Received:2018-11-19 Revised:2019-01-21 Online:2019-08-25 Published:2019-09-06

Abstract: According to the characteristics of GF-2 satellite image data, two different research areas in Linxia Hui Autonomous Prefecture are selected, and uses single-band threshold method, normalized difference vegetation index method (NDVI) and three other water body extraction index methods (NDWI, SWI, MSWI) water body extraction test in two study areas. the effects of threshold values on the accuracy and stability of water extraction in each water body index model are analyzed and compared. It is found that the single-band threshold method in the study area 1 (urban area) has the highest extraction effect of 71.29%, and the stability is good. The extraction accuracy of the MSWI method in the second (mountain) of the study area is up to 95.76%, and the stability is second to that of the single-band method. This experiment provides a reliable reference for GF-2 images when selecting different models and thresholds for water extraction in different regions.

Key words: GF-2 satellite, water body extraction, threshold, stability

CLC Number: