Digital elevation model correction method for interferometric synthetic aperture radar shadow region
An interferometric synthetic aperture and digital elevation model technology, applied in the field of electronic information technology radar, can solve problems such as inapplicability to large-area shadow areas, and achieve the effect of eliminating differences in resolution and coordinate systems, improving integrity, and reasonably and effectively correcting
Active Publication Date: 2020-01-17
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0006] The purpose of the present invention is to provide a digital elevation model correction method for interferometric synthetic aperture radar shadow areas, to overcome the shortcomings of existing correction methods that are not suitable for large-area shadow areas, thereby improving the integrity of interferometric synthetic aperture radar elevation products
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0038]The present invention uses the external low-precision digital elevation model data to correct the digital elevation model of the large-area shadow area in the interferometric synthetic aperture radar image, and firstly eliminates the resolution of the external digital elevation model data and the interferometric synthetic aperture radar digital elevation model data and the coordinate system difference, and then through the correction of the overall elevation deviation in the shaded area and the smoothing of edge jumps, the effective correction of the digital elevation model in large-area shadowed areas is realized, thereby overcoming the problem that the interpolation-based digital elevation model correction method is...
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The invention discloses a digital elevation model correction method for an interferometric synthetic aperture radar shadow region. The digital elevation model correction method comprises the steps of:corresponding ASTER DEM data which corresponds to a scene region to digital elevation model data of an interferometric synthetic aperture radar slant range plane, wherein the ASTER DEM is an advancedspaceborne thermal emission and reflection radiometer global digital elevation model; detecting a shadow region in an interferometric synthetic aperture radar region and extracting edges of the shadow region; determining overall elevation deviation of an interferometric synthetic aperture radar digital elevation model and the ASTER DEM in the shadow region by means of edge elevation statistics for each closed shadow region in the interferometric synthetic aperture radar image; and calculating a corrected ASTER DEM value based on the calculated overall elevation deviation, and supplementing anelevation value of each pixel in the shadow region with the corrected ASTER DEM value. According to the digital elevation model correction method, the digital elevation model obtained by interferenceprocessing is corrected by using the external low-precision digital elevation model data, so that the integrity of the digital elevation model data is improved.
Description
technical field [0001] The invention relates to the technical field of electronic information technology radar, in particular to a method for correcting a digital elevation model of an interference synthetic aperture radar shadow area. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is a technology that uses the interferometric phase information of two-channel synthetic aperture radar complex data to extract the elevation information or change information of the surface, and it extends the measurement of synthetic aperture radar to three-dimensional space , with all-weather, all-weather, high-precision characteristics, so it has a wide range of applications in many fields such as topographic surveying and mapping, glacier research, marine surveying and mapping, and land subsidence monitoring. [0003] In terrain surveying and mapping applications, although interferometric SAR has high-precision surveying and mapping capabilities, due to some in...
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IPC IPC(8): G01S13/90G01C5/00
CPCG01C5/00G01S13/9023
Inventor 李芳芳丁赤飚胡玉新张月婷仇晓兰胡东辉
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI