Water body extraction method based on red light-near infrared spectrum feature space

A near-infrared spectrum and feature space technology, which is applied in the field of water body extraction based on the feature space of red light-near-infrared spectrum, can solve problems such as the failure to form a remote sensing monitoring method for surface water bodies, and achieve universal applicability and avoid inapplicability Effect

Inactive Publication Date: 2016-11-16
XIAN UNIV OF SCI & TECH
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Problems solved by technology

A variety of multi-band water body extraction index methods basically involve the mid-infrared and short-wave infrared bands, but high-resolution remote sensing satellites such as SPOT, QiuckBird, GeoEye, ALOS, Worldview and other sensors do not include the mid-infrared and short-wave infrared bands. Form a set of universal remote sensing monitoring methods for surface water bodies

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  • Water body extraction method based on red light-near infrared spectrum feature space
  • Water body extraction method based on red light-near infrared spectrum feature space
  • Water body extraction method based on red light-near infrared spectrum feature space

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and examples of implementation.

[0023] Using the NIR and Red band reflectance data of the OLI image in the case area (Hongjiannao) to construct the NIR-Red spectral feature space ( figure 1 b). figure 1 a is the spectral curves of four typical features of vegetation, water, bare soil, and buildings in each band of the TM image in the study area. It can be seen that the reflectance of vegetation has a reflection peak in the near-infrared band, the reflectance of bare soil, buildings, and sand increases with the increase of wavelength, and the reflectance of water is lower than that of the other four ground features in each band. . Therefore, in the NIR-Red spectral feature space, the water body ( figure 1 The circle part in b) is in the area closest to the coordinate origin O, and other objects with certain reflection capabilities are in the...

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Abstract

The invention discloses a water body extraction method based on red light-near infrared spectrum feature space. The method comprises the following steps: acquiring real surface reflectance data of researching the red light and near infrared waveband after radiation correction and atmospheric correction; substituting the red light and the near infrared waveband reflectance into a computing formula of the SMMI to acquire an SMMI image of a research region; actually determining the SMMI0 and SMMIs computing method according to the research region, substituting the acquired SMMI0 and SMMIs into the computing formula of the S-SMMI to obtain the image of the research region S-SMMI; performing binarization processing on the image of the research region S-SMMI, and converting the processed grid image into vector data, and extracting the vector boundary and area of a research target. The method disclosed by the invention is suitable for the related research developed based on multi-spectrum remote sensing data, and a constructed surface water body monitoring model has universality.

Description

technical field [0001] The invention relates to a water body extraction method, in particular to a water body extraction method based on a red-near-infrared spectral feature space. Background technique [0002] In recent years, the use of remote sensing to extract water body information on the land surface, conduct water resource surveys, monitor ecological environments, and assess flood disasters has been widely used. Water bodies have unique spectral characteristics, and the absorption of electromagnetic waves in the 0.4-2.5 μm band is significantly higher than that of most other ground features, so the reflectivity is very low, that is, the total radiation level is low. With the increase of the wavelength, the reflection of the water body gradually weakens from the visible light to the mid-infrared band, and the absorption is the strongest in the near-infrared and mid-infrared wavelength ranges, with almost no reflection. Therefore, the difference in reflectance between ...

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Application Information

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IPC IPC(8): G06K9/00G06K9/46
CPCG06V20/38G06V20/13G06V10/56
Inventor 刘英岳辉侯恩科
Owner XIAN UNIV OF SCI & TECH
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