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Urban inland inundation area detection method based on polarized radar remote sensing image

A remote sensing image and polarimetric radar technology, applied in the field of radar remote sensing, can solve the problems of difficulty in obtaining flood inundation information in time, and the inability to obtain effective data from optical remote sensing.

Active Publication Date: 2021-01-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical defect that the occurrence of floods is often accompanied by cloudy and rainy weather, the optical remote sensing cannot obtain effective data, which makes it difficult to obtain flood information in time, and provides a method for detecting urban waterlogged areas based on polarized radar remote sensing images

Method used

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  • Urban inland inundation area detection method based on polarized radar remote sensing image
  • Urban inland inundation area detection method based on polarized radar remote sensing image
  • Urban inland inundation area detection method based on polarized radar remote sensing image

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Embodiment 1

[0058] Such as figure 1 As shown, a method for detecting urban waterlogged areas based on polarimetric radar remote sensing images includes the following steps:

[0059] S1: Obtain polarimetric radar remote sensing images before and during urban flooding, and preprocess the polarimetric radar remote sensing images to extract their backscatter coefficients and interferometric coherence coefficients;

[0060] S2: Through the joint segmentation of the backscatter coefficient and the interference coherence coefficient, meaningful ground feature patches are obtained;

[0061] S3: Based on the backscatter coefficient and interference coherence coefficient of the polarized radar remote sensing image before the city is flooded, the distribution range of the urban area is extracted;

[0062] S4: Based on the change characteristics of backscatter coefficient and interference coherence coefficient of polarized radar remote sensing images before and during urban flooding, construct an Ur...

Embodiment 2

[0086] Such as figure 2 As shown in , Golestan Province in northeastern Iran is selected as the research area. From mid-March to early April 2019, severe floods occurred in Iran, and Golestan Province was one of the worst-hit areas. The test data is the Sentinel-1 polarimetric radar remote sensing image data acquired on March 5, March 17, and March 29, 2019. Among them, the images on March 5, 2019 and March 17, 2019 were acquired before the flood broke out, and the images on March 29, 2019 were acquired after the flood broke out. In addition, the high-resolution optical remote sensing images of Jilin No. 1 acquired on March 29, 2019 were also collected to select verification samples to evaluate a method for urban waterlogging area detection based on polarized radar remote sensing images described in this invention accuracy.

[0087] Table 1 is the Sentinel-1 polarimetric radar remote sensing image data.

[0088] Table 1

[0089]

[0090] Firstly, the SNAP 7.0 software...

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Abstract

The invention provides an urban inland inundation area detection method based on a polarized radar remote sensing image, and the method comprises the following steps: S1, obtaining a polarized radar remote sensing image, carrying out preprocessing of the polarized radar remote sensing image, and extracting a backward scattering coefficient and an interference coherence coefficient; S2, obtaining meaningful ground object patches; S3, extracting a city range; and S4, constructing an urban flood index, and detecting the urban inland inundation area according to the urban flood index. The invention provides an urban inland inundation area detection method based on a polarized radar remote sensing image, and the method builds an urban flood index according to the change features of a back scattering coefficient and an interference coherence coefficient before and during urban flooding, detects an urban inland inundation area through the urban flood index, realizes accurate and timely extraction of urban inland inundation areas, and solves the problem that flood inundation information is difficult to acquire in time due to the fact that flood often accompanies cloudy and rainy weather and optical remote sensing cannot acquire effective data is solved.

Description

technical field [0001] The invention relates to the technical field of radar remote sensing, and more specifically, to a method for detecting urban waterlogged areas based on polarized radar remote sensing images. Background technique [0002] Flood disaster is one of the natural disasters that often occur in urban areas. Especially in recent years, with global climate change and rapid urbanization, frequent urban floods caused by extreme weather have brought huge economic losses to many cities and threatened the personal safety of urban residents. Urban floods have the characteristics of a large submerged area. It is difficult to obtain a complete disaster-affected area through manual ground surveys, and it will consume a lot of manpower and material resources, delaying emergency rescue time. Satellite remote sensing technology has the advantages of short return period, large imaging area, and continuous observation. It provides a fast, safe, and efficient tool for monitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/11G06T5/00G06K9/62
CPCG06T7/0002G06T7/11G06T2207/10032G06T2207/30181G06F18/2411G06F18/24323G06T5/70
Inventor 齐志新张慧
Owner SUN YAT SEN UNIV