Inversion method for biophysical property of forest based on LiDAR comprehensive waveform model

A biophysical and waveform technology, applied in the re-radiation of electromagnetic waves, the use of optical devices, radio wave measurement systems, etc., can solve the problems of reducing the value of waveform data, so as to avoid the value of the waveform data, improve the estimation accuracy, and inversion Flexible and reasonable effect of scale transformation

Active Publication Date: 2014-12-03
NANJING FORESTRY UNIV
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Problems solved by technology

However, due to the abandonment of the rich continuous vertical distribution information of the forest recorded in the original waveform data, the value of the waveform data is greatly reduced.

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  • Inversion method for biophysical property of forest based on LiDAR comprehensive waveform model
  • Inversion method for biophysical property of forest based on LiDAR comprehensive waveform model
  • Inversion method for biophysical property of forest based on LiDAR comprehensive waveform model

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[0039] The technical problem that the present invention intends to solve is as follows:

[0040] 1) Correct the wave width and pulse intensity of the received pulse waveform based on the transmitted pulse waveform and distance (sensor to reflective object). This will help reduce the impact of direction and distance on energy weakening effects, and at the same time facilitate the comparison of different sensors or multi-period LiDAR waveform data.

[0041] 2) It makes the summary of the original waveform signal on the sample plot scale more flexible and reasonable, and is conducive to the explanation of the mechanism. Aiming at the problem of blurring or weakening the original waveform signal by simply synthesizing waveforms on the plot scale, the present invention makes the scale transformation easier by performing tree canopy segmentation and summarizing the waveform information within the range of a single tree (and then summarizing at the stand scale). Flexible and reasona...

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Abstract

Provided is an inversion method for the biophysical property of a forest based on a LiDAR comprehensive waveform model. Crown segmentation is carried out, waveform information within the individual tree range is gathered and then gathered on a standing forest scale, and thus transformation of the inversion scale is more flexible and reasonable; the ground return pulse is determined by means of a digital landform and a height error threshold, so that the determination effect of return pulses of a crown layer is indirectly improved; and characteristic information of comprehensive waveforms is extracted in multiple dimensions, so that rich forest crown layer information is extracted from the waveform data in a deepened manner. The inversion method improves the precision in estimating the biophysical property of the forest, provides theoretical and method supports for explanation of the mechanism, and effectively avoids the defect that value of the waveform data is greatly reduced due to abandonment of rich continuous vertically-distributed information of the forest recorded in original waveform data.

Description

technical field [0001] The invention can be applied in the fields of small-scale and medium-scale forest resource investigation, carbon sink estimation, and forest ecology research monitoring. The invention relates to a method of computing forest biological objects using waveform data obtained by an airborne small-spot full-waveform lidar sensor. The characteristic method, specifically, refers to a method based on data correction, by extracting the geometric and energy information of the waveform in the laser pulse return signal and combining with the single tree segmentation method to model and estimate such as Lorey's tree height, chest height, etc. methods for typical forest biological object properties such as area and volume. Background technique [0002] Airborne small-footprint airborne (LiDAR) is an active remote sensing technology that transmits laser pulses to the surface of objects and analyzes the returned signals. In forestry applications, this technology can b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B11/28G01S17/89
Inventor 曹林代劲松
Owner NANJING FORESTRY UNIV
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