Construction damage assessment method based on single post-earthquake POLSAR image

Abstract

A construction damage assessment method based on a single post-earthquake POLSAR image comprises the following steps: noise removal, survey region extraction and partitioning are performed on an original POLSAR image; non-construction areas are detected; constructions with an NCCC greater than a set threshold are classified as a collapsed construction class, constructions with an NCCC smaller than or equal to the set threshold are classified as a non-collapsed construction class, and pre-assessment is performed; when a homogeneity textural feature HOM of a block which belongs to certain serious damage class is greater than or equal to a preset HOM texture threshold, the block is changed to belong to a medium damage class; a final damage degree classification result is subjected to precision evaluation. According to the construction damage assessment method, detection and evaluation of collapsed constructions are performed through only single post-earthquake perfect-polarization SAR data, evaluation precision is improved, and dependence on pre-earthquake data of disaster monitoring in the prior art is reduced.

Description

technical field [0001] The invention belongs to the technical field of polarimetric radar remote sensing image processing, and designs a new method for post-earthquake building detection and damage degree estimation using only a single post-earthquake full-polarization synthetic aperture radar (POLSAR) image. Background technique [0002] Earthquakes in my country are characterized by high frequency, high intensity, shallow focus and wide distribution. Statistics show that my country's land earthquakes account for one-third of the world's land earthquakes, and the number of deaths caused by earthquakes is more than half of the world's. For example, the Wenchuan 5.12 earthquake in 2008 and the Yushu earthquake in Qinghai in 2010 caused great losses to people's lives and property. After the earthquake, a large number of houses and roads were damaged, and the weather conditions were bad, which made it extremely difficult to obtain information on the disaster site in time. Rem...

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Problems solved by technology

At present, post-earthquake full-polarization SAR data acquired by spaceborne and my country's airborne SAR platform (SARMAPPER) play an important role in earthquake relief, but the current use of full-polarization data requires a lot of manual interpretation to provide post-disaster There is no systematic damage map for collapsed buildings detection and damage assessment method, and the utilization rate and interpretation accuracy of full-polarization SAR data are relatively low

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