External digital elevation model dem correction method and device
A digital elevation model and elevation value technology, applied in the field of surveying and mapping, can solve problems such as external digital elevation model DEM errors, and achieve the effect of improving accuracy
Active Publication Date: 2021-07-13
榆林市国土资源局
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[0004] However, in coal mining monitoring, due to human activities in the mining area, the topography will change in a short period of time. At this time, when the external digital elevation model DEM is used for differential processing, the external digital elevation model DEM error will be introduced into the monitoring results.
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[0024] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.
[0025] Before describing the embodiment of the present application in detail, the usage scenarios of the embodiment of the present application will be introduced first.
[0026] D-INSAR (Differential Interferometric Synthetic Aperture Radar) measurement technology is a widely used measurement technology for surface micro-deformation. At present, the commonly used differential interferometry methods include two-track method, three-track method and four-track method. The elevation information obtained by SAR image interferometry using the three-t...
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The invention provides a method and device for correcting an external digital elevation model DEM, and relates to the technical field of surveying and mapping. Mapping relationship: match the external digital elevation model DEM pixel with the INSAR-DEM pixel according to the established mapping relationship, and confirm the abnormal pixels in the external digital elevation model DEM pixel that meet the requirements; remove the external digital elevation model DEM pixel Get the hollowed-out pixel of the abnormal pixel, and obtain the corrected pixel value of the abnormal pixel according to its elevation value and the elevation value of the corresponding INSAR-DEM pixel; finally, according to the external digital elevation model DEM pixel value of the abnormal pixel and The corrected pixel value of the abnormal pixel corrects the abnormal pixel of the external digital elevation model DEM. Since the abnormal pixels of the external digital elevation model DEM can be corrected according to the fused external digital elevation model DEM pixel values, the accuracy of the external digital elevation model DEM data is improved.
Description
technical field [0001] The invention relates to the technical field of surveying and mapping, in particular to an external digital elevation model DEM correction method and device. Background technique [0002] Differential interferometric radar measurement technology refers to the acquisition of two interference images of the same area before and after deformation, and then obtains the measurement technology of surface micro-deformation through differential processing of the two interference images. At present, the commonly used differential interferometry methods include two-track method, Three-track method and four-track method. Among them, the elevation information obtained by SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) image interferometry using the three-track method and the four-track method has large errors, so the two-track method is often used for differential interferometry. [0003] In the prior art, when using the two-track method for differential ...
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IPC IPC(8): G06T5/50G06T5/00G06T17/05
Inventor 贺枫斐李安雄谢东柴小兵白海军谢静波刘伟任永贤马超崔帅王江涛杨潇潇温泽华
Owner 榆林市国土资源局