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Method for estimating global vegetation coverage

A vegetation coverage, global technology, applied in the field of environmental science, can solve the problems of limited application of physical methods, too many parameters to be estimated, insufficient data volume, etc., to achieve the effect of high universality, few parameters to be estimated, and high approximation accuracy

Active Publication Date: 2014-11-12
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

However, this method requires a large amount of data. The application of existing satellite remote sensing data needs to consider time, space, angle, spectral response, etc., and the amount of data is often insufficient.
On the other hand, how to choose a model is in a dilemma: if the model is complex, there are many parameters to be estimated and it is difficult to calculate; if the model is simple, there is still a large error between the existing radiative transfer model and the actual situation
Therefore, problems in both data and models limit the application of physical methods

Method used

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  • Method for estimating global vegetation coverage
  • Method for estimating global vegetation coverage
  • Method for estimating global vegetation coverage

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Embodiment Construction

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0056] Embodiments of the present invention propose a method for estimating global vegetation coverage, see figure 1 , the method includes:

[0057] Step 101: Select several global land surface space sampling points according to the global vegetation type distribution;

[0058] Step 102: Obtain the first surface albedo data with higher spatial r...

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Abstract

The invention provides a method for estimating global vegetation coverage. The method comprises the following steps: firstly, selecting a plurality of global land surface space sampling points according to distribution of global vegetation types; acquiring a first earth surface reflectivity data with a high space resolution and a second earth surface reflectivity data with a low space resolution in satellite remote sensing data at the sampling points, and then acquiring a vegetation coverage training sample by using the first earth surface reflectivity data through a dimidiate pixel model; subsequently extracting the second earth surface reflectivity data and the vegetation coverage which is calculated according to the first earth surface reflectivity data with the space corresponding to the space of the second earth surface reflectivity data at the sampling points, respectively taking the second earth surface reflectivity data and the vegetation coverage as input and output of the training sample so as to train a generalized regression neural network; and finally estimating the global land surface vegetation coverage according to the second earth surface reflectivity data by using the trained model. The method for estimating the global vegetation coverage makes full use of ground actual measurement data, remote sensing observation data with high space resolution and artificial intelligence learning algorithm, and has the advantages of good stability, high adaptability, high accuracy, easiness in operation and the like.

Description

technical field [0001] The invention relates to environmental science, in particular to a method for estimating global vegetation coverage. Background technique [0002] Vegetation is the most basic part of terrestrial ecosystems, and all other organisms depend on vegetation. Vegetation coverage is defined as the percentage of the vertical projected area of ​​green vegetation on the ground to the total area of ​​the statistical area. It is an important parameter to describe the vegetation coverage on the ground, and it is also a basic and objective indicator indicating the change of the ecological environment. Occupy an important position in the sphere, hydrosphere and biosphere. In addition, from the perspective of general application, vegetation coverage has a wide range of applications in agriculture, forestry, resource and environment management, land use, hydrology, disaster risk monitoring, drought monitoring and other fields. Therefore, it is of great significance t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00G01S7/48
CPCG01S7/4802
Inventor 贾坤梁顺林刘素红刘强李钰溦
Owner BEIJING NORMAL UNIVERSITY
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