Extraction method and accuracy evaluation of typical lake water body in Hoh Xil region based on GF-6 WFV data

doi:10.13474/j.cnki.11-2246.2022.0137

Abstract

Abstract: Lakes are sensitive indicators of climate change. It is of great significance to obtain lake water information quickly and accurately for the study of regional climate change and the protection and governance of regional ecological environment. According to the characteristics of GF-6 WFV satellite image data, four lakes at different locations in Hoh Xil area are selected as the research objects, and uses single-band method,band difference method and normalized difference water index(NDWI) water body information extraction in four lakes. The data obtained by visual interpretation are used as real ground data to evaluate the accuracy of different water body extraction methods. The results show that the results of single band method is easily affected by shallow water body, but less affected by snow, while band difference method and NDWI method are greatly affected by snow. Although NDWI can effectively extract shallow water body, it is still affected by lake bottom sediments to a certain extent. Compared with single band method and NDWI method, band difference method can effectively distinguish shallow water bodies and background features.

Key words: GF-6 WFV data, lake water body, extraction method, accuracy evaluation, Hoh Xil

CLC Number:

P237

WANG Renjun, LIU Baokang, DU Yu'e, ZHANG Hongli, YU Zhiyuan. Extraction method and accuracy evaluation of typical lake water body in Hoh Xil region based on GF-6 WFV data[J]. Bulletin of Surveying and Mapping, 2022, 0(5): 32-37.

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