A method for extracting river water surface elevation based on space-borne interferometric imaging altimeter

Abstract

The invention discloses a river surface elevation extraction method based on a spaceborne interference imaging altimeter. The method comprises the following steps: 1) extracting a binary image of a river mask based on a two-channel coherence coefficient image; 2) extracting the central area of the binary image of the river mask along the river to obtain the center image of the river mask; step 3)processing the interference phase of a two-channel complex image, inverting to obtain a digital elevation model image, and multiplying by the center image of the river mask to obtain a river elevationimage; 4) eliminating the singular points in a river height observation value of the river elevation image, and then performing sliding window averaging of the river height observation value along the river to obtain a smoothed river elevation image; 5) extracting an elevation value of a river water surface from the smoothed river elevation image. The method disclosed by the invention has the advantages of improving the extraction precision of the river elevation, and facilitating realization, and is beneficial to the promotion and application of river water level monitoring.

Description

technical field [0001] The invention relates to the field of interference information extraction technology and image processing technology, especially for small incident angle, short baseline space-borne interference imaging altimeters, which can realize the extraction of river water surface elevation of such altimeter data products, and specifically relates to a space-borne interference imaging Altimeter method for extracting river water surface elevation. Background technique [0002] In global change science research, the dynamic monitoring of inland water level is an indispensable part of understanding the global water cycle process. Human beings live by water, and rivers are an important fresh water resource and one of the key points of ecological and environmental protection. In hydrological research, river water level is one of the most basic and key observations. Traditionally, on-site measurement equipment (such as water level gauges, etc.) is used to provide inf...

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Problems solved by technology

[0003] Due to the narrow swath of the traditional space-borne altimeter (incidence angle of 0°), the distribution of sub-satellite points is sparse, and the coverage of inland waters is limited; and the incidence angle of interferometric synthetic aperture radar (SAR) is generally 20°-60° , the research on river elevation extraction in inland waters is almost blank

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