A method for monitoring solar radiation in forest gaps based on lidar

A technology of solar radiation and lidar, applied in the field of solar radiation monitoring of forest windows

Active Publication Date: 2020-07-07
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Claims
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Problems solved by technology

Most of the domestic research focuses on the monitoring of forest biomass using ALS, while the measurement of solar radiation in forest gaps rarely involves

Method used

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  • A method for monitoring solar radiation in forest gaps based on lidar
  • A method for monitoring solar radiation in forest gaps based on lidar
  • A method for monitoring solar radiation in forest gaps based on lidar

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Embodiment 1

[0081] Embodiment 1: as Figure 1-11 , the present invention utilizes airborne laser radar (ALS) point cloud data to monitor the solar radiation at different positions in the forest gap under clear weather conditions, while taking into account the influence of complex terrain, canopy shape and light transmittance, and improves the monitoring accuracy. The first step is to use the ALS point cloud data to identify the forest gap and determine the edge of the forest gap; the second step is to estimate the solar radiation intensity in the sunny weather in the area to be measured according to the sun altitude angle and azimuth angle, and combine the digital elevation model DEM to calculate The amount of direct sunlight and diffuse radiation received above the canopy under complex terrain conditions; the third step, according to the fluctuation state of the canopy surface model DSM, taking into account the canopy shading relationship and the beam penetration coefficient, calculate th...

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Abstract

The invention discloses a forest gap solar radiation monitoring method based on laser radar. The forest gap solar radiation monitoring method comprises the following steps that step 1: the forest gapis identified based on the laser radar ALS point cloud data so as to determine the edge of the forest gap; step 2: the total solar radiation Gi of the local incident angle direction received on the lower canopy layer under the complex terrain conditions is calculated; and step 3: the solar radiation intensity Globalgap of different positions in the forest gap is calculated based on Gi. The forestgap solar radiation monitoring method based on the laser radar is easy to implement and high in monitoring efficiency.

Description

technical field [0001] The invention relates to a laser radar-based solar radiation monitoring method for forest gaps. Background technique [0002] The concept of canopy gap was first proposed by British ecologist Watt in 1947. It mainly refers to the main forest layer in the forest community being disturbed by humans (selective logging) or natural disturbances (gale, snow, flood, debris flow, insect pests and other disasters). A discontinuous forest void formed in the forest canopy. Gap is an important small and medium-scale disturbance that often occurs in forest communities. It is an important stage of forest succession. It is not only the driving factor of forest community succession, but also plays an important role in forest structure, species composition, dynamics and succession. It has become one of the most active fields of forest ecology research. [0003] In the woodland environment, solar radiation is divided into direct radiation and diffuse radiation. Direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/00
CPCG01J1/00
Inventor 刘峰杨志高肖化顺
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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