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A chlorophyll inversion method suitable for sparse vegetation areas

A sparse area, chlorophyll technology, applied in the field of remote sensing, to achieve the effect of improving inversion accuracy

Inactive Publication Date: 2018-02-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

But the vegetation index combination is in the range of low chlorophyll concentration (C ab 2 ) is still relatively sensitive to the soil background, that is, there are still great limitations in the retrieval of chlorophyll during the growth period of vegetation seedlings

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  • A chlorophyll inversion method suitable for sparse vegetation areas

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] The specific implementation of the patented method is as follows: first, preprocessing the acquired hyperspectral remote sensing images, mainly including radiometric calibration, atmospheric correction, redundant band removal, etc., to obtain the surface reflectance, and then calculate the chlorophyll to be used Combination CI of two vegetation indices green / G and TCARI / OSAVI. Secondly, through the PROSAIL model, the reflectance of the vegetation canopy in the range of 400-2500nm is forward simulated and the CI green / G and TCARI / OSAVI. Finally, a cost function between the simulated vegetation index combination and the observed vegetation index combination is established and minimized using an optimization algorithm. Such as figure 1 As shown, CI green / G in the low concentration range of chlorophyll (Cab2 ) is insensitive to changes in LAI ( figure 1 (a)...

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Abstract

The invention discloses a method for reducing the influence of soil background on the inversion result of chlorophyll by using vegetation index combination. This method first needs atmospheric correction of remote sensing images, and then calculates two vegetation index combinations: CIgreen / G and TCARI / OSAVI, and finally introduces them into the model cost function for subregional inversion. For the low chlorophyll concentration area, CIgreen / G is used to control the inversion results; for the middle and high chlorophyll concentration areas, TCARI / OSAVI is used to control the inversion results, and the threshold of chlorophyll content division is determined according to the actual situation. When using this method for chlorophyll inversion, the LAI can be set to a fixed value, which is beneficial to the improvement of model execution efficiency and inversion accuracy. Therefore, the technical method provided by this patent has an obvious effect on reducing the influence of soil background in the process of inversion of vegetation chlorophyll in sparse areas.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, and relates to a chlorophyll inversion method suitable for sparse vegetation areas, and specifically relates to a method for reducing the influence of soil background in sparse vegetation areas on chlorophyll inversion results by combining multiple vegetation indices . Background technique [0002] Chlorophyll is the basic component of vegetation leaves, which is closely related to photosynthetic process, light energy utilization of solar radiation, and absorption of atmospheric carbon dioxide. Moreover, chlorophyll, as an important nitrogen-containing substance in leaves, has a relatively accurate indicator effect on the absorption and utilization of nitrogen nutrients in plants. Therefore, accurate estimation of vegetation chlorophyll content is of great significance for the study of vegetation health, productivity estimation, and carbon cycle research. [0003] Physical model inversio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25
Inventor 何彬彬殷长明全兴文
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA