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A method and system for obtaining alteration information

An acquisition method and alteration technology, which is applied in the field of remote sensing image processing and can solve problems such as poor extraction effect

Active Publication Date: 2020-04-21
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, this application provides a method and system for obtaining alteration information to solve the abnormal results that may be generated when extracting the alteration information of remote sensing images in deep-cut areas, and to solve the The problem of poor extraction effect when altering information of remote sensing images

Method used

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  • A method and system for obtaining alteration information
  • A method and system for obtaining alteration information
  • A method and system for obtaining alteration information

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Embodiment 1

[0087] In this example, the remote sensing image is Sentinel 2 image (6593 rows × 5923 columns, 13 bands) of the Longbaqibao research area. Through experimental comparison, the satellite data to be used determined according to the remote sensing image is Sentinel 2 satellite data;

[0088] Figure 6(a) is the sub-area (size: 1430 rows × 930 columns) image of the original remote sensing image, and Figure 6(b) is the extracted Fe 3+ Iron-stained mineral image, Figure 6(c) is the Fe extracted by the band ratio method in the prior art 3+ Iron-stained mineral image, Figure 6(d) is the Fe extracted by the alteration information acquisition method provided by the embodiment of the present application 3+ Iron stained mineral image. When performing principal component transformation, relevant parameter statistics are only carried out in the cloud-free and snow-covered areas. In the band ratio image (Fig. 6(c)), the prominent alteration band in the middle is located on the sunny slope...

Embodiment 2

[0093] Hydroxyl alteration information can also be effectively extracted by using the method for obtaining alteration information provided in the embodiment of the present application. Figure 7(a) is the sub-area (size: 1430 rows × 930 columns) of the Sentinel 2 image in the Longbaqibao research area, and Figure 7(b) is the hydroxyl minerals extracted by the principal component analysis method of the prior art Figure 7(c) is the hydroxyl mineral image extracted by the band ratio method in the prior art, and Figure 7(d) is the hydroxyl mineral image extracted by the alteration information acquisition method provided by the embodiment of the present application; from Fig. It can be seen that the three hydroxyl alteration information images (Figure 7(b), Figure 7(c) and Figure 7(d)) ​​are very similar, and the hydroxyl alteration bands in the images are effectively extracted.

[0094] The alteration information acquisition system provided by the embodiment of the present applicat...

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Abstract

The invention discloses an alteration information obtaining method and system, wherein the alteration information obtaining method is characterized in that a traditional principal component analysis method is improved; the process of determining information of mineral to be recognized in a remote sensing image by the principal component analysis method according to a determined band ratio extraction formula of alteration mineral to be recognized is divided into three conditions; once or multiple principal component analysis is performed, so that the goal of obtaining the alteration informationto be recognized by directly using the principal component analysis method is realized; the problems that the abnormity is possibly generated when the alteration information is extracted from the remote sensing image in a deep cut topography region, and the alteration mineral information cannot be effectively extracted from the remote sensing image in the region with severe land cover are avoided.

Description

technical field [0001] The present application relates to the technical field of remote sensing image processing, and more specifically, to a method and system for obtaining alteration information. Background technique [0002] Alteration means that when fluid or hydrothermal fluid acts on rocks, the two must tend to reach chemical equilibrium and undergo material exchange, resulting in the disappearance of some or all of the original minerals in the rock and the formation of new minerals, that is, Metasomatism in which some substances in the original rock are partially or completely brought out and new substances are brought in. Alteration information is of great significance to mineral detection. Therefore, extracting alteration information from remote sensing maps is an important part of the mineral detection process. [0003] Existing methods for extracting alteration information from remote sensing images mainly include band ratio method and principal component analysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/55G01N21/17
CPCG01N21/17G01N21/31G01N21/55G01N2021/1793
Inventor 荆林海丁海峰唐韵玮李慧戈文艳苗中杰
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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