Method and device for estimating forest above-ground biomass

A biomass and forest technology, applied in measurement devices, radio wave measurement systems, image data processing, etc., can solve problems such as forest spatial structure characteristics that do not consider stand density

Inactive Publication Date: 2015-02-18
RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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Problems solved by technology

[0004] The inventors found in the process of realizing the present invention that the problem of signal saturation will have a greater impact on the estimation accuracy of forest aboveground biomass i...

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  • Method and device for estimating forest above-ground biomass
  • Method and device for estimating forest above-ground biomass

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Embodiment 1

[0022] Embodiment 1. A method for estimating forest aboveground biomass.

[0023] figure 1 It is a flow chart of the method for estimating forest aboveground biomass in an embodiment of the present invention.

[0024] exist figure 1 In step 1, read in a pair of polarimetric interferometric SAR (Synthetic Aperture Radar, synthetic aperture radar) images, and perform image preprocessing on the read in pair of polarimetric interferometric SAR images.

[0025] Specifically, a pair of polarization interference SAR images in this embodiment refers to a main image (the main image is a polarization SAR image) and an auxiliary image corresponding to the main image (the auxiliary image is also a polarization SAR image) ; for example, an example of the main image in an L-band pair of polarimetric SAR images is Figure 2a As shown, an example of the auxiliary image in the L-band pair of polarization interferometric SAR images is Figure 2b shown. That is to say, a pair of polarizatio...

Embodiment 2

[0120] Embodiment 2: A device for estimating forest aboveground biomass. The main structure of the device is as Figure 7 shown.

[0121] exist Figure 7 Among them, the forest aboveground biomass estimation device mainly includes: a preprocessing module 700, a vertical distribution module 710, a forest area module 720, a stand module 730, a parameterization module 740, a model building module 750 and a forest aboveground biomass estimation module 760 . In addition, the device of this embodiment may further include: a ground phase module 770 and a tree height module 780 .

[0122] The preprocessing module 700 is mainly used to read a pair of polarimetric interferometric SAR images, and perform preprocessing on the read pair of polarimetric interferometric SAR images. A pair of polarimetric SAR images here includes: a main image and an auxiliary image.

[0123] Specifically, the image preprocessing performed by the preprocessing module 700 on the read-in pair of polarimetr...

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Abstract

The invention relates to a method and device for estimating forest above-ground biomass. The method comprises the steps that perpendicular distribution of the relative reflectivity of pixels is estimated for a pair of preprocessed polarization interference SAR images by using a Legendre expansion equation of multiple correlation of the pixels in the perpendicular direction; scattering type distinguishing is conducted on all the pixels in the preprocessed main image, areas formed by all volume scattering type pixels in the image are regarded as forest areas, and object-oriented partition is conducted, so that a plurality of polygon forest stands representing homogeneity forest objects are obtained; for all the polygon forest stands, average relative reflectivity perpendicular structural sections are calculated respectively, and parameterized processing is conducted on the average relative reflectivity perpendicular structural sections; a multi-element linear forest above-ground biomass estimation model is established according to multiple obtained parameters, and the forest above-ground biomass of the polygon forest stands is calculated through the multi-element linear forest above-ground biomass estimation model. According to the technical scheme, the forest above-ground biomass can be more accurately estimated.

Description

technical field [0001] The invention relates to forest aboveground biomass estimation technology, in particular to a forest aboveground biomass estimation method and device. Background technique [0002] Forest is one of the important resources on earth, and the estimation of forest above ground biomass (AGB) is very important for understanding and protecting forest resources. [0003] At present, there are two main methods for forest aboveground biomass estimation: the first is to estimate forest aboveground biomass based on microwave backscatter coefficient or albedo in optical remote sensing; the second is to estimate forest aboveground biomass based on forest height. The growth equation was used to estimate forest aboveground biomass. [0004] The inventors found in the process of realizing the present invention that the problem of signal saturation will have a greater impact on the estimation accuracy of forest aboveground biomass in the first method, while the second ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G01S13/90
CPCG01S13/9005G01S13/9023G06T2207/10044G01S13/9076
Inventor 陈尔学白黎娜田昕冯琦
Owner RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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