Method for measuring vegetation coverage of sandy land vegetation in alpine fragile area based on TLS

A measurement method and technology of vulnerable areas, applied in the field of vegetation coverage measurement at the quadrat scale of sandy vegetation in alpine and fragile areas, to achieve the effect of reducing sample plot investigation and improving the accuracy of parameter extraction

Active Publication Date: 2020-04-10
NANJING FORESTRY UNIV
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Problems solved by technology

However, it is found that there are few studies on the vegetation coverage of low-altitude ecosystems using TLS, and it is still challenging to accur...

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  • Method for measuring vegetation coverage of sandy land vegetation in alpine fragile area based on TLS
  • Method for measuring vegetation coverage of sandy land vegetation in alpine fragile area based on TLS
  • Method for measuring vegetation coverage of sandy land vegetation in alpine fragile area based on TLS

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Embodiment Construction

[0033] Below in conjunction with specific examples, further illustrate the present invention, the examples are implemented under the premise of the technical solutions of the present invention, it should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0034] The implementation site of the embodiment is located on the north side of the highway from Zedang to Sanye Township (91.324°E, 29.181°N) in the Shannan region of the middle reaches of the Yarlung Zangbo River, with an altitude of about 3590m, belonging to the semi-arid monsoon climate zone of the plateau temperate zone. The climate is characterized by a warm and semi-arid climate, with an annual precipitation of 300-450mm and an average annual temperature of 6.3-8.7°C. Winter and spring are cold and windy, while summer is warm and humid with rain and heat in the same season. Since 2008, the forestry department has protect...

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Abstract

The invention discloses a method for measuring vegetation coverage of a sandy land quadrat scale in an alpine fragile area by using a foundation laser radar, and belongs to the field of forest resource monitoring and ecological factor investigation. The vegetation coverage refers to the vertical projection area of the land covered by plant branches and leaves. According to the research, a vegetation coverage extraction method combining a two-dimensional canopy height model (CHM) and three-dimensional point cloud is provided, for the quadrat scale, the resolution suitable for extracting the shrub vegetation coverage of the alpine sandy area is discussed, and a canopy height model with the appropriate resolution is selected to accurately extract the quadrat scale vegetation coverage. According to the invention, the three-dimensional point cloud information of artificial vegetation of the sandy land is obtained and processed, the vegetation coverage information of the sample plot can be accurately obtained on the basis of reducing the traditional survey of the sample plot, so that the vegetation recovery condition of the alpine sandy land area is better mastered, and technical supportis provided for sandy land vegetation recovery and ecological function recovery expressed by multi-dimensional information.

Description

technical field [0001] The invention belongs to the technical field of dynamic monitoring of forest resources, and in particular relates to a method for measuring vegetation coverage at the quadrat scale of sandy land vegetation in alpine vulnerable areas based on TLS. Background technique [0002] Vegetation coverage is an important factor in forest resources investigation, and also an important factor reflecting forest structure and environment. Accurate extraction of vegetation coverage in alpine and vulnerable areas has important practical reference significance for promoting accurate accounting of ecological service functions and values ​​from the perspective of vegetation level coverage in this area, and improving the accuracy of biodiversity monitoring. Usually, the acquisition of vegetation coverage parameters mainly depends on field surveys and interpretation of large-scale aerial photographs, etc., which has a large workload and is highly subjective. Smith et al. ...

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Application Information

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IPC IPC(8): G01S17/89G06T3/40
CPCG01S17/89G06T3/4038Y02A90/10
Inventor 田佳榕李海东徐雁南马伟波廖承锐吕国屏
Owner NANJING FORESTRY UNIV
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