A multi-angle observation method for accurate inversion of sunlight-induced chlorophyll fluorescence in shade and sun leaves of vegetation

Abstract

The invention provides a method of utilizing a multi-angle observation system to obtain the vegetation canopy spectroscopic data to precisely inverting sunlight induced chlorophyll fluorescence of shade / sun leaves of a canopy, and belongs to the research field of vegetation remote sensing inversion parameter obtaining methods. The method comprises following steps: establishing a multi-angle super-hyperspectral observing system; obtaining multi-angle super-hyperspectral data; calculating the solar incident angle and canopy reflection brightness; calculating the reflection rate and inverted chlorophyll fluorescence; using a leaf clamp to observe the leaf reflection rate; utilizing the ratio of canopy reflection rate to leaf reflection rate, under the assistance of a geometrical optical model, calculating the ratio of shade / sun leaves from different observation angles, and obtaining the fluorescence of the sun leaves and shade leaves through fitting of least square method. The provided method can obtain continuous multi-angle vegetation canopy super-hyperspectral data, is used to invert chlorophyll fluorescence, can simply and effectively calculate the ratio of sun leaves and shade leaves of a canopy from different observation angles and solar incident angles based on the leaf reflection rate and a geometrical optical model, calculates the fluorescence of the sun leaves and shadeleaves, and improves the precision of monitoring the primary productivity of a land.

Description

[0001] 1. Technical field [0002] The present invention relates to a method for accurately retrieving the sunlight-induced chlorophyll fluorescence of yin and yang leaves in the canopy using the vegetation canopy spectral data obtained by a multi-angle observation system, specifically, it refers to an integrated multi-angle hyperspectral automatic observation system that acquires The multi-angle vegetation canopy reflectance spectrum, the method of calculating the chlorophyll fluorescence of the shade leaves and sun leaves of the vegetation canopy under different solar zenith angles and different observation angles, belongs to the research field of vegetation remote sensing inversion parameter acquisition methods. [0003] 2. Background technology [0004] The total primary productivity of vegetation refers to the ability of plants to fix carbon dioxide through photosynthesis, which is the production capacity of terrestrial ecosystems under natural conditions. The total primar...

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Problems solved by technology

[0008] However, the optical remote sensing observation is affected by the bidirectional reflection of the canopy, and the observation from a single angle cannot rule out the interference of many factors

Moreover, existing studies rarely consider the inherent differences in chlorophyll fluorescence and photosynthesis between shaded leaves (i.e., shade leaves) and illuminated leaves (i.e., sun leaves) inside the vegetation canopy, which will inevitably affect the relationship between canopy chlorophyll fluorescence and productivity. relationship conclusion

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