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Estimation method and device of vegetation leaf area index

A technology of leaf area index and vegetation, which is applied in the field of estimation of vegetation leaf area index, can solve the problems of poor temporal and spatial accuracy of data, unpredictability of data, etc., and achieve the effect of important scientific value and application value

Active Publication Date: 2017-05-31
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

MODIS data is obtained by using existing observation data, and the limitation is that it cannot predict the data in the future period; while the data released by IPCC is based on fixed existing meteorological data, and the data is obtained in units of square kilometers, which is limited by the time and space of the data poor precision

Method used

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  • Estimation method and device of vegetation leaf area index
  • Estimation method and device of vegetation leaf area index
  • Estimation method and device of vegetation leaf area index

Examples

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Comparison scheme
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Embodiment 1

[0049] figure 1 It is a flow chart of a method for estimating the vegetation leaf area index provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation of estimating the vegetation leaf area index according to the forecasted meteorological data. The method can be obtained from the vegetation leaf area index Estimating means to perform, specifically including the following steps:

[0050] Step 110, establish the corresponding relationship between the leaf area index and the meteorological data, the corresponding relationship includes parameters to be determined.

[0051] Among them, the leaf area index is also called the leaf area coefficient, which refers to the multiple of the total area of ​​plant leaves on the land area per unit land area.

[0052]The embodiment of the present invention estimates the leaf area index according to the meteorological data, and first establishes the corresponding relationship between the leaf area index a...

Embodiment 2

[0079] image 3 It is a flow chart of a method for estimating vegetation leaf area index provided by Embodiment 2 of the present invention. This embodiment is a preferred example based on the above embodiment. This embodiment takes the Biliu River Basin as an example to illustrate the The estimation of the area index specifically includes the following steps:

[0080] Step 310, establish the corresponding relationship between the leaf area index and the near-surface air temperature, relative humidity and long-wave radiation, and the corresponding relationship is as follows:

[0081]

[0082] Among them, LAI is the leaf area index, LAI max is the maximum leaf area index of the same vegetation, rad lw is the longwave radiation, Rh is the relative humidity, T air is the near-surface air temperature, x 1 ,x 2 ,x 3 ,x 4 ,x 5 ,x 6 is the parameter to be determined, and exp is an exponential function with the natural constant e as the base.

[0083] Among them, the Biliu...

Embodiment 3

[0094] Figure 7 It is a structural schematic diagram of a device for estimating vegetation leaf area index provided by Embodiment 3 of the present invention, as Figure 7 As shown, the device for estimating the leaf area of ​​vegetation shown in this embodiment includes: a correspondence relationship establishment module 710 , a parameter calibration module 720 to be determined and a leaf area index estimation module 730 .

[0095] Wherein, the corresponding relationship establishment module 710 is used to establish the corresponding relationship between the leaf area index and the meteorological data, and the corresponding relationship includes parameters to be determined;

[0096] The parameters to be determined calibration module 720 is used to calibrate the parameters to be determined according to the corresponding relationship, the leaf area index samples and the corresponding existing meteorological data;

[0097] The leaf area index estimation module 730 is configured t...

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Abstract

The invention discloses an estimation method and device of an vegetation leaf area index. The method comprises the steps of building a correspondence relation of the leaf area index and atmospherical data, wherein the correspondence relation comprises a parameter to be determined; calibrating the parameter to be determined according to the correspondence relation, a leaf area index sample, and corresponding existing atmospherical data; determining the leaf area index according to the correspondence relation, the calibrated parameter to be confirmed, and forecast atmospherical data. According to the estimation method and device of the vegetation leaf area index, the leaf area index can be estimated through the forecast atmospherical data in future period, the change of the vegetation leaf area index can be simulated in a good spatial-temporal scale when the forecast atmospherical data is high in spatiotemporal precision, methods and evidence are provided for study of a rainfall runoff process without leaf area index observation data in future, and thus the estimation method and device of the vegetation leaf area index have important scientific value and application value.

Description

technical field [0001] Embodiments of the present invention relate to vegetation leaf area index simulation technology, in particular to a method and device for estimating vegetation leaf area index. Background technique [0002] The impact of land vegetation cover on rainfall interception, evapotranspiration, and runoff generation and confluence needs to be considered in hydrological simulations, especially when studying rainfall runoff processes for which there are no observations in the future. As an important parameter of terrestrial vegetation coverage, the vegetation leaf area index has an important impact on the simulated surface soil evaporation and vegetation leaf evaporation. Surface soil evaporation simulation has an important impact on surface soil moisture, infiltration and runoff; vegetation foliage evaporation water comes from the water absorbed by vegetation roots from the soil root zone, so vegetation foliage evaporation simulation has an important effect on...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/02
CPCG06Q50/02G06F30/20
Inventor 齐伟刘俊国
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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