Hyperspectral remote sensing spectral characteristic absorption position determination method and system

Abstract

The invention discloses a hyperspectral remote sensing spectral characteristic absorption position determination method and system. The method comprises the following steps: acquiring hyperspectral remote sensing data and a mineral characteristic spectrum band; determining a spectrum section range of the hyperspectral remote sensing data according to the characteristic spectrum band of the mineral to obtain original spectrum data; carrying out continuum removal on the original spectrum data to obtain spectrum data after continuum removal; the wavelength position corresponding to the minimum value of the spectrum curve after continuum removal is the lowest absorption position; the wavelength position corresponding to the lowest reflectivity of the spectral curve of the original spectral data is the lowest reflectivity position; and determining a spectral characteristic absorption position according to the calculated lowest absorption position and the lowest reflectivity position. The method overcomes the defects of a traditional method in spectral characteristic absorption position determination, mineral types and component information can be accurately determined, and the method has obvious advantages when a large amount of hyperspectral data is processed in a batched and business mode.

Description

technical field [0001] The invention relates to the field of hyperspectral remote sensing data processing, in particular to a method and system for determining a spectral characteristic absorption position of hyperspectral remote sensing. Background technique [0002] Due to its nanoscale spectral resolution, hyperspectral remote sensing data can obtain continuous spectral curves of surface objects, and then achieve fine characterization and identification of surface objects. When using hyperspectral remote sensing data to carry out mineral identification, the main basis is its spectral characteristic spectrum shape and characteristic absorption position and other parameters. Especially for fine identification of mineral information, its spectral characteristic absorption position is an important parameter to determine information such as mineral type and composition. [0003] In the past, the method of obtaining the spectral characteristic absorption position was to remove...

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Problems solved by technology

However, with the promotion and deepening of the application, it is gradually found that this method has defects in the processing of aerial / sky hyperspectral data. When the spectral curve is checked, it is found that the spectral characteristic absorption position often drifts left and right by one band after the spectral curve is checked. , so that the obtained spectral characteristic absorption position may not be true, which in turn leads to misidentification of mineral composition information

There is also a polynomial fitting of the spectrum after the continuum is removed, and the lowest value is found from the fitted spectrum, but it ignores the formation mechanism of the spectral absorption feature, and only regards the spectral curve as a data object for fitting Therefore, this polynomial fitting will artificially change the spectral characteristics, especially when the mineral information content is relatively low or when multiple minerals are mixed, this processing method is even less applicable

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