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Quantitative and qualitative description method for impermeable surface indexes based on atmospheric correction

An atmospheric correction and index technology, applied in measurement devices, complex mathematical operations, material analysis by optical means, etc., can solve problems such as lack of due attention to influence

Pending Publication Date: 2020-07-03
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

There are few studies on the comprehensive analysis and comparison of the performance of the impervious surface index retrieved under the DN value, TOA reflectivity, and Surface reflectivity. At the same time, the influence of atmospheric correction on the extraction of the urban impervious surface index lacks due attention. Therefore, different It is necessary to do further comparative research on the results obtained by the processing methods

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  • Quantitative and qualitative description method for impermeable surface indexes based on atmospheric correction
  • Quantitative and qualitative description method for impermeable surface indexes based on atmospheric correction
  • Quantitative and qualitative description method for impermeable surface indexes based on atmospheric correction

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Embodiment Construction

[0040] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0041] The technical scheme that the present invention solves the problems of the technologies described above is:

[0042] The Landsat8 remote sensing images of the study area in step (1) above were purchased or downloaded from some professional websites.

[0043] Further, the above-mentioned step (2) is to use the existing software including ENVI5.3, with the assistance of Landsat-8 satellite images, to perform geometric fine correction on all bands in the original image including the thermal infrared band, Then use the ENVI-FLASSH tool to perform atmospheric correction on the surface reflectance of each band, and obtain the atmospherically corrected surface reflectance data.

[0044] Further, the abov...

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Abstract

The invention provides a quantitative and qualitative description method for impermeable surface indexes based on atmospheric correction. The method comprises the following steps: carrying out data preprocessing on a Landsat8 remote sensing image of a research area through an existing method; remote sensing data based on different radiation correction levels (radiation calibration and FLASSH atmospheric correction) is researched. A Chongqing main city is used as a research area; the method comprises the following steps: extracting different types of building indexes by utilizing the gray value(DN), the apparent TOA reflectivity and the Surface reflectivity of a Landsat-8 image, and extracting different types of building indexes according to the different types of building indexes; the NDBI, IBI, UI and BUAI impermeable surface index change characteristics, distribution range, correlation coefficient and extraction precision of three different processing stages of gray value inversion,radiometric calibration and atmospheric correction are compared and analyzed in detail, and the influence of atmospheric correction on the performance difference of inverted building indexes is evaluated. The method can provide certain research significance and application value for remote sensing influence on extraction of impervious surface information.

Description

technical field [0001] The invention belongs to the field of urban impermeable surface information. Specifically, the four impervious surface indices in three different processing stages of gray value, radiometric calibration, and atmospheric correction are inverted, and the method for further quantitatively analyzing the influence of atmospheric correction on the performance difference of impervious surface indices. Background technique [0002] The impervious surface index is a remote sensing technology that extracts the distribution of urban impervious surfaces and reflects the dynamic expansion of cities in the field of remote sensing. Scholars at home and abroad have conducted a lot of research. However, remote sensing images are usually interfered by the sensor itself, the atmosphere, aerosols and other factors, so it is necessary to extract the urban impervious surface index after atmospheric correction. [0003] The impervious surface index retrieved from remote sen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G01N21/17
CPCG06F17/18G01N21/17G01N2021/1793
Inventor 陶于祥曹勇邓陆
Owner CHONGQING UNIV OF POSTS & TELECOMM
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