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Method for calculating high and cold withered grass coverage based on withered grass vegetation index

A vegetation coverage and vegetation index technology, applied in the field of grassland remote sensing, can solve the problem that the sample coverage range does not include 0-100%, and achieve the effect of making up for inapplicability and high sensitivity

Active Publication Date: 2021-08-13
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology

[0007] In summary, the shortcomings of the prior art are mainly reflected in the fact that its sample coverage range does not include 0-100%

Method used

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  • Method for calculating high and cold withered grass coverage based on withered grass vegetation index
  • Method for calculating high and cold withered grass coverage based on withered grass vegetation index
  • Method for calculating high and cold withered grass coverage based on withered grass vegetation index

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Embodiment Construction

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0057] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and...

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Abstract

The invention discloses a method for calculating high and cold withered grass coverage based on a withered grass vegetation index. The withered grass reflectivity of a corresponding wave band of an MODIS is calculated by utilizing actually measured withered grass hyperspectral data and a wave band response function of the MODIS; then calculating dispersion data of the subglazed reflection spectrum by using a range analysis method to obtain a sensitive wave band of subglazed spectrum reflectivity. and in combination with the wavelength range of the MODIS sensitive wave band, selecting a corresponding MODIS wave band to construct a withered grass vegetation index DGVI, and further correcting the withered grass vegetation index on the basis of the withered grass vegetation index DGVI. An inversion model of the withered grass coverage is constructed on the basis of the corrected vegetation index, and compared with inversion models constructed by the vegetation indexes such as NDVI and RVI, it is proved that the coverage estimation value error of the withered grass inversion model constructed by the DGVI is obviously smaller than that of other models.

Description

technical field [0001] The invention relates to the field of grassland remote sensing, in particular to a method for calculating alpine subtilized grass coverage based on the subtilized grass vegetation index. Background technique [0002] Vegetation coverage refers to the percentage of the vertical projected area of ​​vegetation (including leaves, stems, and branches) in a unit area, and is an important parameter indicating changes in the ecological environment. Vegetation coverage is not only used as an important input parameter in hydrological models, climate models, and ecosystem simulation models, but also as an intuitive quantitative indicator to describe the growth status of terrestrial vegetation, which is widely used in vegetation change monitoring, ecological environment investigation, and comprehensive evaluation. Drought, sandstorm and other natural disaster monitoring and soil and water conservation and many other research fields. As the third pole of the world...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G06K9/00
CPCG01N21/25G01N2021/1797G06V20/194G06V20/188
Inventor 段旭辉徐维新梁好代娜肖强智王淇玉张娟
Owner CHENGDU UNIV OF INFORMATION TECH
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