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Novel satellite-borne laser radar tree height extraction method

A technology of lidar and tree height, which is used in the re-radiation of electromagnetic waves, the use of re-radiation, measurement devices, etc., and can solve the problems of difficult separation of terrain and vegetation waveforms, and large terrain fluctuations.

Active Publication Date: 2016-08-17
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

However, since GLAS is a large spot (each spot is an ellipse of 70m), and the terrain of the forest vegetation area has large fluctuations, the estimation accuracy of the image forest canopy height makes it difficult to separate the terrain and vegetation waveforms in some cases.

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  • Novel satellite-borne laser radar tree height extraction method
  • Novel satellite-borne laser radar tree height extraction method
  • Novel satellite-borne laser radar tree height extraction method

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Embodiment Construction

[0009] The general idea of ​​the patent of the present invention is: use GLAS data to extract rough forest canopy height, and establish a geometric physical model of tree height. This model fully considers the influence of spot size, orientation, slope, and aspect factors on tree height, and analyzes its influence law, and finally get the precise forest canopy height ( figure 1 ).

[0010] The forest canopy height H is obtained by calculating the difference between the first canopy echo signal of the lidar and the peak value of the last echo (ground echo) ( figure 2 ). The spaceborne GLAS waveform starts to be system noise, and the canopy echo is recorded at a certain time interval from the time the noise threshold is exceeded. The first echo signal is the beginning of the signal, that is, the lidar signal touches the top of the canopy and reflects at the same time. It also represents the distance from the canopy to the sensor, the peak point of the last echo represents the...

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Abstract

Waveform data of a satellite-borne laser radar GLAS can be decomposed into two mixed generalized Gaussian waveforms representing a forest canopy part and a ground part of a laser spot respectively. The position of the ground is determined precisely according to crest positions of the waveform of the ground part, the position of the top of a forest canopy can be determined according to the waveform starting position of the GLAS, and finally the forest canopy height is obtained. The forest canopy height is affected by the shape and size of the spot, the gradient and the slope aspect, so that a novel tree height geometrical and physical correction model is provided. According to the model, the influences of the factors on tree height are fully considered, the influences of transmission pulse width on the tree height are also considered, and eventually the forest canopy height is extracted precisely. The GLAS data is utilized for precise extraction of the forest canopy height, the defects in forest vegetation height research through a former remote sensing method are overcome, the estimation precision of the forest canopy height is improved, and a new path is opened up for global carbon cycle and global climate change research.

Description

Technical field [0001] The patent of the present invention is a technology in the field of earth observation, and relates to a method for extracting forest canopy height by using spaceborne lidar data. This method has certain universality and is a method with theoretical research and practical application value. Background technique [0002] "Carbon" is not only an environmental issue, but also contains more economic and political issues. The study of the global carbon cycle is one of the core research contents of climate change, and the spatio-temporal variation of carbon storage is still a common problem that countries all over the world need to solve. Finding out China's carbon source / sink in the global carbon cycle is related to the formulation of my country's future energy policy and how to implement the United Nations Framework Convention on Climate Change. [0003] Forest height is an important parameter reflecting carbon storage. The traditional method to obtain fo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/88
CPCG01S17/88
Inventor 王成聂胜习晓环
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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