Semi-empirical inversion method for chlorophyll content of vegetation canopy
A technology of chlorophyll content and vegetation canopy, applied in the field of semi-empirical inversion of chlorophyll content of vegetation canopy, can solve the problems of lack of complete expression of canopy three-dimensional structure parameter information, limitation of high saturation of chlorophyll content, and limited inversion accuracy, etc. Achieve the effect of reducing saturation limitations, high universality, and increasing information
Active Publication Date: 2021-06-08
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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[0006] The main purpose of the present invention is to propose a semi-empirical inversion method for the chlorophyll content of the vegetation canopy, to solve the lack of information of the traditional vertical observation spectrum reflecting the canopy structure parameters, lack of complete expression for the canopy three-dimensional structure parameter information, and limit the Its inversion accuracy, and when the vegetation index is used for inversion, the chlorophyll content is high, and there will be saturation limitations
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0036] Such as figure 1 as shown, figure 1 The flow chart of the semi-empirical inversion method for the vegetation canopy chlorophyll content provided by the embodiment of the present invention, the method includes:
[0037] Step S1: Obtain the multi-angle spectral data of the vegetation canopy at the ground point of the area to be measured.
[0038] Obtain the vegetation canopy spectral data under different observation zenith angles in the backscattering area and forward scattering area of the ground point in the area to be measured on the main plane of the sun, where the back on the main plane of the sun is the observation direction and The direction of incidence of the sun is on the same side, and the forward dire...
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A semi-empirical inversion method for the chlorophyll content of a vegetation canopy comprises the following steps: acquiring multi-angle spectral data of the vegetation canopy of a ground point of a region to be detected; based on a vegetation radiation transfer model PROSAIL, extracting a vegetation index MCARI from spectral data of a point with the strongest reflectivity in a back scattering area and spectral data of a point with the weakest reflectivity in a forward scattering area in the obtained vegetation canopy multi-angle spectral data, and then obtaining a hot dark spot chlorophyll index HDCI through calculation according to the extracted vegetation index MCARI; and substituting the HDCI into an inversion model to calculate the chlorophyll content of the vegetation canopy. The vegetation indexes are extracted by utilizing the thermal dark spot observation spectrum data in the main plane of the sun, and the thermal dark spot chlorophyll index is newly built by combining the difference values, so that the saturation limitation of the vegetation indexes under single vertical observation can be reduced, and the canopy three-dimensional structure parameter information is increased, thereby reducing the uncertainty of the inversion result of the chlorophyll content of the vegetation canopy, and improving the inversion precision.
Description
technical field [0001] The invention relates to the technical field of remote sensing inversion, in particular to a semi-empirical inversion method for chlorophyll content in vegetation canopies based on multi-angle remote sensing data. Background technique [0002] The chlorophyll content of vegetation is an important indicator of its photosynthetic ability and growth status, and its content directly affects the photosynthetic and material accumulation capabilities of vegetation. The chlorophyll content of a leaf can only reflect the photosynthetic characteristics of a single plant, but the canopy structure of a plant is also important for the formation of later plant yields, and the canopy chlorophyll content (CCC) is the chlorophyll content per unit land area, including the Physical and chemical parameters such as content, biomass and leaf area index (LAI) can express the photosynthetic production and growth characteristics of vegetation groups. Therefore, accurate estim...
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Login to View More IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 孔维平黄文江马灵玲朱小华刘耀开周贤锋
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI