Method for eliminating shadow interference during urban water body extraction through remote sensing images

A technology for remote sensing images and water bodies, applied in the field of remote sensing, can solve the problem of indistinguishability between urban water bodies and shadows, and achieve the effect of eliminating shadow interference and simplifying the technical process.

Pending Publication Date: 2020-06-12
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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Problems solved by technology

[0006] The present invention aims to solve the technical problem that the existing remote sensing image technology is difficult to distinguish between urban water bodies and shadows, and provides a method for eliminating shadow interference when remote sensing images extract urban water bodies

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  • Method for eliminating shadow interference during urban water body extraction through remote sensing images
  • Method for eliminating shadow interference during urban water body extraction through remote sensing images
  • Method for eliminating shadow interference during urban water body extraction through remote sensing images

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Embodiment 1

[0064] Embodiment 1: A method for eliminating shadow interference when extracting urban water bodies from remote sensing images of this embodiment is carried out in the following steps:

[0065] (1) Remote sensing image preprocessing: Carry out radiometric calibration and atmospheric correction on the original Landsat 8 image, take Changchun City, Jilin Province as the research area, and crop the image according to the research area to obtain the urban area image;

[0066] (2) Spectral fusion and calculation of MNDWI: In the Landsat 8 image of the urban area, the image of the panchromatic band with a spatial resolution of 15 meters is used for the image of the green band (Green) with a spatial resolution of 30 meters and the spatial resolution Perform spectral fusion for 30-meter short-wave infrared 1-band (SWIR1) images, enhance the spatial resolution of green-band and SWIR 1-band images to 15 meters, and use ENVI5.3 software to calculate and correct the normalized water index...

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Abstract

The invention discloses a method for eliminating shadow interference during urban water body extraction through remote sensing images, relates to a method for eliminating interference of the remote sensing image, and aims to solve the technical problem that urban water and shadows are difficult to distinguish by the conventional remote sensing image technology. The method comprises the following steps of: respectively fusing a panchromatic waveband, a green waveband and a short-wave infrared 1 waveband to enhance spatial resolution, and calculating MNDWI; determining an MNDWI value by adoptinga maximum between-cluster classification method, and removing pixels smaller than the MNDWI value as a non-water surface to obtain a preliminary water body extraction image; determining a cold pool space in the city by adopting the maximum between-cluster classification method based on the thermal infrared 1 waveband; filtering the preliminary water body extraction result by using a cold pool space to obtain an urban water body image of which the building shadow is removed, and the resolution of the data is 15 meters. The method is simple, rapid in water body extraction and effective in shadow removal, and can be applied to the fields of urban water resource monitoring, water conservancy planning and protection and urban science research.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, and in particular relates to a method for eliminating shadow interference when extracting urban water bodies based on remote sensing images. Background technique [0002] Urban water bodies are an important part of urban ecosystems, and play an important role in humidification and cooling, maintaining vegetation growth, maintaining biodiversity, and recreation. Accurately extracting urban water bodies from remote sensing images can support urban planning, landscape optimization, environmental monitoring, and scientific research. [0003] With the enhancement of the spatial resolution of remote sensing images, the spatial units of the urban surface are more obvious in the images, which is conducive to enhancing the accuracy of water surface extraction. However, as the pixel heterogeneity increases, the shadows of urban buildings become more obvious. They have similar spectral characteristi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50G06T7/11G06T7/90
CPCG06T5/008G06T5/50G06T5/006G06T7/11G06T7/90G06T2207/10032G06T2207/20221Y02A30/60
Inventor 董禹麟任志彬何兴元
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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