Joint topographic mapping method based on space-borne SAR image and optical image

Abstract

The invention discloses a joint topographic mapping method based on a space-borne SAR image and an optical image. The method comprises the following steps: constructing a SAR positioning model to realize high-precision positioning of the SAR image; constructing a space-borne SAR stereo model, and acquiring topographic map elements based on the stereo model; establishing a registration model of theSAR image and the optical image with relatively low resolution to realize matching of the optical image with the pixel level of the SAR image positioned in the step S1; and jointly performing automatic extraction of a ground object target based on the low-resolution optical image and the SAR image after registration, and fusing an extracted element vector with the acquired element vector of the SAR stereo model to integrate a digital line drawing result. The method can be applied to domestic high-resolution No.3 SAR images and foreign SAR images, reduce the cost of production using airborne SAR image mapping, promotes domestic SAR satellite application, improves mapping accuracy, and has important theoretical significance and application popularization value.

Description

technical field [0001] The present invention relates to the technical field of surveying and mapping, and more specifically, relates to a combined topographic map surveying method based on spaceborne SAR images and optical images. Background technique [0002] The "National Basic Surveying and Mapping Mid- and Long-term Planning Outline (2015-2030)" points out that it is necessary to "focus on promoting laser and radar data acquisition" and "expand the coverage of high-precision basic geographic information". Due to the long-term limitation of climate conditions and the level of surveying and mapping technology and equipment, it is very difficult to obtain optical images in our province, which seriously restricts the development of basic surveying and mapping work in our province. Sichuan provincial 1:10,000 topographic map still has 35% of the area not covered, and it is one of the few provinces (districts) in the country that does not cover the whole area. Therefore, "Sich...

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Problems solved by technology

[0004] In recent years, many scholars at home and abroad have carried out research on spaceborne SAR technology. The commonly used data include spaceborne SAR data of COSMO-SKYMED and TerraSAR-X, but most of the research is biased towards InSAR technology research, which is oriented to spaceborne SAR image measurement1 : Less research on 10,000 topographic maps

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