High-frequency estimation method of water quantity of small and micro wetlands based on multi-source remote sensing data fusion

Abstract

The application discloses a small and micro wetland water quantity high-frequency estimation method based on multi-source remote sensing data fusion, extracts water bodies by using fused data with high spatial and temporal resolution, and extracts small and micro wetlands according to hydrological connectivity; an outer rectangle is drawn for each independent small and micro wetland, and a potential water level sequence of the small and micro wetland unit is generated based on a digital elevation model and the outer rectangle; the water body range extracted from the potential water level is superimposed with the small and micro wetland extracted by using the fused data, the spatial range difference of the two is fitted to determine an optimal water level, and the optimal water level is corrected based on spatial topology; and the water quantity of each small and micro wetland is calculated based on the corrected water level sequence. The application acquires water quantity change information with more abundant data quantity and longer series, makes up for the shortcomings of low spatial and temporal resolution and limited service period of single optical remote sensing data or radar / laser altimetry satellites, and provides technical support for water quantity balance analysis of remote and unmeasured wetlands and evaluation of flood cutting and dryness supplementing effects of floodplain areas.

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