Method for calculating Al-OH absorption position of muscovite by using hyperspectral data

A data calculation and muscovite technology, applied in the field of hyperspectral remote sensing analysis, can solve the problems that restrict the application of aerial hyperspectral data, and it is difficult to distinguish the small changes of different muscovite minerals.

Active Publication Date: 2018-05-08
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

[0004] The traditional hyperspectral alteration mineral extraction method can accurately extract muscovite minerals, but it is difficult to distinguish different muscovite minerals due to the limitation of the spectral resolution of aerial hyperspectral imaging equipment (such as the spectral resolution of SASI is 15nm). Small changes among minerals, such as muscovite minerals with different Al-OH absorption peak positions (2180nm-2230nm), thus greatly restricting the further application of airborne hyperspectral data

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  • Method for calculating Al-OH absorption position of muscovite by using hyperspectral data

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0016] The present invention uses hyperspectral data to calculate the method for Muscovite Al-OH absorption position, and its concrete realization steps are as follows:

[0017] Step 1. Use aerial hyperspectral data to extract muscovite minerals, read atmospherically corrected image files, perform minimum noise separation (MNF), data dimension judgment, obtain endmember spectra, calculate pure pixel index, N-dimensional A series of calculation processes of visualization, end member spectrum selection and spectrum identification extract muscovite minerals, and the result is recorded as result (Muscovite), which is stored as an image. The pixel value containing muscovite minerals is recorded as 1, and does not contain muscovite The pixel value of the parent mineral is recorded as 0;

[0018] Step 2. Carry out band calculations on the aerial hyp...

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Abstract

The invention belongs to the technical field of hyperspectral remote sensing analysis, and particularly relates to a method for calculating the Al-OH absorption position of muscovite by using hyperspectral data. The method comprises: 1, extracting muscovite type minerals, and recording the result as result (Muscovite); 2, carrying out wave band calculation on aviation hyperspectral data, and recording the calculation result as result (Al-OH); 3, calculating the intersection set of the treatment result of the step 1 and the treatment result of the step 2, and recording as result (mus-wavelength); and 4, carrying out density division on the result obtained in the step 3. According to the present invention, based on the aviation hyperspectral data in the existing spectral resolution, the muscovite type mineral unit is extracted, the Al-OH absorption peak position of the muscovite type mineral is calculated through the wave band calculation, and further the muscovite type mineral is subdivided according to the absorption peak position so as to be well used for mineral exploration.

Description

technical field [0001] The invention belongs to the technical field of hyperspectral remote sensing analysis, in particular to a method for calculating muscovite Al-OH absorption position with hyperspectral data. Background technique [0002] Airborne hyperspectral data have been widely used in surface alteration mineral mapping. At present, people mainly obtain hyperspectral data through aerial hyperspectral imaging equipment (such as Hymap in Australia, CASI / SASI / TASI in Canada, etc.), and use a A series of technical means are used to extract the altered mineral information from these data. These technical means are mainly based on the comparison of the reflectance spectrum of the hyperspectral image with the spectral library or endmember spectrum. It can extract serpentine, tremolite, Dozens of altered minerals, such as limonite, muscovite, montmorillonite, kaolinite, chlorite, epidote, and calcite, have high identification accuracy and are therefore widely used. [0003...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/55G01N21/84
CPCG01N21/55G01N21/84G01N2021/8477
Inventor 孟树叶发旺张川刘洪成
Owner BEIJING RES INST OF URANIUM GEOLOGY
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