A Method for Extracting Mineral Alteration Information

An extraction method and alteration technology, which is applied in the field of mineralization and alteration information extraction, can solve problems affecting the accuracy of mineralization and alteration information extraction, and achieve the effects of improving indication ability, strong recognition ability, and reducing environmental noise

Inactive Publication Date: 2015-08-26
CENT SOUTH UNIV +1
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  • Abstract
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Problems solved by technology

However, the traditional Crosta technology calculates the eigenvector value of each component based on the statistical analysis of the entire image, which leads to the inclusion of interference information such as water bodies, clouds, ice and snow in the statistical calculation process, so that the obtained abnormal results also include A large amount of noise affects the accuracy of mineralization and alteration information extraction to a certain extent

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  • A Method for Extracting Mineral Alteration Information
  • A Method for Extracting Mineral Alteration Information
  • A Method for Extracting Mineral Alteration Information

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Embodiment Construction

[0014] In order to be more clear about the technical scheme of the present invention, the specific embodiments are described in detail as follows:

[0015] The implementation case of the present invention selects TM and ASTER remote sensing images of a lead-zinc polymetallic mining area in the northern section of the Sanjiang metallogenic belt in Qinghai as the specific implementation object.

[0016] The implementation steps are as follows:

[0017] a. Input a remote sensing image A, respectively select a TM and ASTER remote sensing image as input a remote sensing image A.

[0018] b. Distinguish and identify valid background pixels on the input remote sensing image A, where valid background pixels refer to non-damaged data pixels, non-water body pixels, non-cloud pixels, non-ice and snow pixels, and non-vegetation images Yuan. Vegetation and water bodies can be identified by using the normalized difference vegetation index NDVI and the normalized difference water index NDW...

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Abstract

The invention discloses a method for extracting mineralization-alteration information. The method comprises the steps of effective background pixel identifications, selection of local variable windows, in-window main component analysis, construction of abnormal variables, abnormal recognition and assignment and alteration abnormal output. Interference information such as water, cloud, ice and snow is eliminated through identifications and statistics of effective background pixels; and statistics variables are limited within the windows rather than the whole image range during main component analysis through local variable windows, therefore further reduction of interference of ambient environment noise is facilitated, and the extraction capacity of alteration information is improved. By means of the method, the potential of mineralization-alteration charting of thematic mapper (TM) and advanced spaceborne thermal emission and reflection radiometer (ASTER) remotely-sensed can be further mined, and the indication capacity in geological exploration can be improved.

Description

technical field [0001] The invention relates to a method for extracting mineralization alteration information, which belongs to the field of geological exploration. Background technique [0002] During the whole process of formation and evolution of ore deposits, its ore-forming conditions are manifested as geological anomalies in the process of geological evolution, so finding geological anomalies has become one of the necessary conditions for predicting ore deposits. Geochemical anomalies, geophysical anomalies and mineralized alteration remote sensing anomalies have become commonly used ore prospecting parameters in ore prospecting. The feature-oriented principal component analysis, that is, Crosta technology, plays an important role in ore prospecting indication, and has been widely used in information enhancement processing of altered rocks in ore deposits and in ore prospecting. However, the traditional Crosta technology calculates the eigenvector value of each compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V8/02
Inventor 彭光雄邵拥军李善平
Owner CENT SOUTH UNIV
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