Interpolation-based DEM correction method for InSAR small-area shadow region
A shadow area, small area technology, applied in the field of electronic information technology radar, can solve the problems of inapplicability, inconsistent resolution, coordinate system accuracy, low resolution of external DEM data, etc., to achieve the effect of improving integrity
Pending Publication Date: 2020-09-04
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology
[0004] At present, a commonly used method for DEM correction of interferometric SAR shadow areas is to use external coarse-precision DEM data for supplementary correction. The problem of inconsistency such as rate, coordinate system, precision, etc., the processing process is complicated, and it is usually used for correction of large-area shadow areas. For small-area shadow areas, this type of method is not applicable
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[0023] The invention discloses an interpolation-based correction method for a digital elevation model (DEM) of a small-area shadow area of an interferometric synthetic aperture radar (InSAR). This method first determines the small-area area by counting the area of the shadow area, and then uses the interpolation method to calculate the DEM along the observation line of sight as the DEM inside the shadow area, and finally eliminates the stripes through smoothing along the azimuth direction Effect, realizes fast and effective correction of DEM of small shadow area, thus overcomes the disadvantage that the correction method based on external rough precision DEM data is not suitable for small shadow area, and improves the integrity of InSAR DEM data.
[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference t...
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An interpolation-based InSAR small-area shadow region DEM correction method comprises the following steps: detecting a shadow region in an interference SAR image, and regularizing the edge of the shadow region by using a morphological method; counting the area of each closed shadow region, setting a threshold value A, and judging the region with the area smaller than the threshold value as a small-area shadow region; for each closed shadow area, extracting the edge of the shadow area; for each closed small-area shadow area, scanning each azimuth door of the area, selecting two edge points of ashort-distance end and a long-distance end on the azimuth door along the distance direction, and reading elevation values of the two edge points; for each closed small-area shadow area, calculating the elevation on the observation sight line of the azimuth door through interpolation along the distance direction according to the elevations of the two edge points of each azimuth door; and scanningeach distance gate in the small-area shadow area, and performing mean filtering on pixels on the distance gates so as to eliminate a stripe effect between different azimuth gates.
Description
technical field [0001] The invention relates to the technical field of electronic information technology radar, in particular to an interpolation-based DEM correction method for InSAR small-area shadow areas. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) uses the interferometric phase information of the two channels of Synthetic Aperture Radar (SAR) to extract the elevation information or change information of the surface, which can extend the SAR measurement to three-dimensional space, with all-day, All-weather, high-precision characteristics, so it has a wide range of applications in many fields such as terrain surveying and mapping, surface deformation monitoring and so on. [0003] In terrain mapping applications, due to some characteristics of SAR itself, InSAR terrain mapping has limitations in difficult areas such as overlapping, shadows, and water bodies. Among them, in the shadow area, because the slope of the back slope of the scen...
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Login to View More IPC IPC(8): G06T5/00G06T5/30G06T7/13G06T7/62
CPCG06T5/30G06T7/62G06T7/13G06T2207/10044G06T5/70
Inventor 李芳芳丁赤飚胡玉新张月婷胡东辉
Owner AEROSPACE INFORMATION RES INST CAS