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Method and system for rapidly extracting the largest and smallest possible surface water range based on sentinel-2 images

A surface water and image technology, applied in character and pattern recognition, instrument, scene recognition, etc., can solve problems such as not being used, and achieve the effect of improving efficiency

Active Publication Date: 2020-11-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no use of Sentinel-2 satellite multispectral remote sensing data (Sentinel-2MSI) with a revisit period of 2-5 days and a spatial resolution of 10 meters (Sentinel-2MSI) to quickly extract the maximum and minimum possible surface water ranges in a long time interval. method

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  • Method and system for rapidly extracting the largest and smallest possible surface water range based on sentinel-2 images
  • Method and system for rapidly extracting the largest and smallest possible surface water range based on sentinel-2 images
  • Method and system for rapidly extracting the largest and smallest possible surface water range based on sentinel-2 images

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Embodiment Construction

[0038] In order to facilitate the understanding and implementation of the present invention by those of ordinary skill in the art, the following uses the Google EarthEngine cloud platform to extract the largest and smallest possible surface water ranges in Jiangxi Province, China in 2018 using Sentinel-2MSI remote sensing images as an example to further describe the present invention in detail :

[0039] Step 1: Obtain all Sentinel-2MSI image collections in the target area within the specified time range;

[0040] In this step, all available Sentinel-2MSI image collections in Jiangxi Province in 2018 were obtained, including 3767 scene images.

[0041] Step 2: Remove all images with large cloud coverage from the image collection;

[0042] Through the cloud cover attribute CLOUD_COVERAGE_ASSESSMENT that comes with the Sentinel-2 remote sensing image, set the threshold value to 5%, filter out the images with the cloud cover attribute value higher than 5%, and the remaining 238 images, g...

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Abstract

The invention discloses a method and system for quickly extracting the maximum and minimum possible surface water body ranges based on Sentinel-2 remote sensing images, which can solve the problem of using Sentinel-2MSI images to quickly extract the maximum and minimum possible surface water bodies within a long-term range and in a designated area scope. After inspection, the present invention utilizes the new normalized difference water index (nNDWI) and the new normalized difference vegetation index (nNDVI) of each scene image each pixel in Sentinel-2's unique narrow-wave near-infrared calculation image collection, and remote sensing The image mosaic technology overcomes the cumbersome steps of extracting surface water separately for each image in the traditional method, and improves the efficiency of extracting the maximum and minimum coverage of surface water in long-term intervals. The water body extraction method established by the invention plays an important role in reflecting regional surface water resource reserves and periodic changes, researching and judging flood disasters, and studying regional ecological environment carrying capacity.

Description

Technical field [0001] The invention relates to the field of remote sensing data application, and in particular to a method for quickly extracting the maximum and minimum possible surface water ranges based on Sentinel-2 remote sensing images. Background technique [0002] Water resources are essential to promote sustainable development, support human life, maintain the balance of the ecosystem, and play an irreplaceable role in ensuring economic development. Surface water, as a type of surface cover, is an important indicator of water resources and plays an important role in climate regulation, biogeochemical cycles, and surface energy balance. In recent decades, many countries, especially developing countries, have experienced rapid urbanization. Surface water changes caused by human activities have severely affected surface temperature, soil moisture, biodiversity, ecosystem functions, and even human life. Therefore, monitoring the dynamic changes of surface water is essentia...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/46
CPCG06V20/13G06V10/56
Inventor 王超陈泽强陈能成王伟
Owner WUHAN UNIV