Multi-angle grassland vegetation leaf area index observation method and instrument

A technology of leaf area index and grassland vegetation, applied in the field of multi-angle grassland vegetation leaf area index observation, can solve the problems of large measurement error, destructive sampling of grassland vegetation, high uncertainty, etc., achieve easy operation and improve manual measurement The effect of large error and high precision

Inactive Publication Date: 2017-03-08
GRASSLAND RES INST OF CHINESE ACAD OF AGRI SCI
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Problems solved by technology

Aiming at the shortcomings of the prior art such as cumbersome manual measurement of grassland vegetation leaf area index, destructive sampling of grassland vegetation by measurement tools, large error and high uncertainty of final measurement results, the method for calculatin

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  • Multi-angle grassland vegetation leaf area index observation method and instrument
  • Multi-angle grassland vegetation leaf area index observation method and instrument
  • Multi-angle grassland vegetation leaf area index observation method and instrument

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as Figure 1 to Figure 7 As shown, a multi-angle grassland vegetation leaf area index observation method includes the following steps: a. First, calibrate the multi-angle observation sensor for the vegetation canopy used in the study. This calibration process mainly completes two key operations: the optical Center (Optical center) calculation and sensor pixel (Sample pixel) projection function fitting, so that each sample pixel of multi-angle observation has calibrated multi-angle information; b. Then, use the calibrated lens to perform Multi-angle observation of radiation information of vegetation canopy and conventional vertical observation of vegetation canopy; c. Observation data of multi-angle observation of radiation information of vegetation canopy can be used to estimate leaf area index; conventional vertical observation of ...

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Abstract

The invention discloses a multi-angle grassland vegetation leaf area index observation method and an instrument. Firstly, a vegetation canopy multi-angle observation sensor used for research is calibrated, and each sampling pixel for multi-angle observation has calibrated multi-angle information; then, a lens after calibration is used for vegetation canopy radiation information multi-angle observation and conventional vegetation canopy vertical observation; the canopy multi-angle observation data are used for binary classification on vegetation and non vegetation, and the classification data are used for realizing calculation on a canopy gap rate and an aggregation index; and finally, a leaf area index estimation model built based on a regularization method is used for acquiring the numerical value of the vegetation leaf area and outputting the value. The sensor lens is used for observing the multi-angle radiation information of the grassland vegetation canopy and input data are provided for a numerical value algorithm; and the regularization numerical value calculation process is adopted, and the leaf area index numerical value result calculation algorithm can be realized based on the theoretical process.

Description

technical field [0001] The invention belongs to the technical field of ecological application, and in particular relates to a multi-angle observation method and instrument for grassland vegetation leaf area index. Background technique [0002] The leaf area index is defined as the numerical value of the leaf area on one side of the vegetation per unit area, and is a key parameter indicating the state of the vegetation growth process. The conventional measurement method of the leaf area index of the vegetation canopy in the prior art is to measure the real physical area of ​​the vegetation leaf and then perform numerical calculation based on the relevant calculation method. The results are susceptible to actual operation and there is a high degree of uncertainty. The technical solutions in the prior art also have the following disadvantages: 1. Observation instruments are easily affected by high-intensity scattered light under natural conditions, similar to the phenomenon of...

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Application Information

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IPC IPC(8): G01B11/28
CPCG01B11/28
Inventor 郭利彪吴新宏侯向阳姜超孙世贤张勇丁勇
Owner GRASSLAND RES INST OF CHINESE ACAD OF AGRI SCI
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