Title:
FOREST STAND CANOPY DENSITY MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2024/060509
Kind Code:
A1
Abstract:
A forest stand canopy density measurement method, comprising the following steps: (1) determining a measurement region, and using a flight route passing over the measurement region as a canopy density measurement transect line; (2) carrying an active ranging module on an aircraft, starting the active ranging module, the aircraft executing flight and measurement according to the flight route, measuring a laser ranging distance at each sampling point, and storing sampling point coordinates (x1, y1, z1; x2, y2, z2; xn, yn, zn) of the active ranging module; and (3) comparing the sampling point coordinates (x1, y1, z1; x2, y2, z2; xn, yn, zn) of the active ranging module with take-off point coordinates to obtain height values of the aircraft; calculating the difference between the laser ranging distance (H1, H2, H3) of each sampling point and the corresponding aircraft height, determining whether the difference is greater than a set threshold (F), if yes, determining that no coverage is present at the sampling point, and if not, determining that coverage is present at the sampling point; gathering the results of all sampling points, and calculating the forest stand canopy density. The method has reliable measurement accuracy, a high measurement speed, and a simple measurement process, and can quickly complete forest stand canopy density measurement in batches.
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Inventors:
GAO FEI (CN)
LI NANA (CN)
LI BEIBEI (CN)
LI TAO (CN)
LI NANA (CN)
LI BEIBEI (CN)
LI TAO (CN)
Application Number:
PCT/CN2023/077764
Publication Date:
March 28, 2024
Filing Date:
February 23, 2023
Export Citation:
Assignee:
UNIV SICHUAN (CN)
SICHUAN PROVINCIAL INST OF FORESTRY AND GRASSLAND INVENTORY AND PLANNING (CN)
SICHUAN PROVINCIAL INST OF FORESTRY AND GRASSLAND INVENTORY AND PLANNING (CN)
International Classes:
G01C15/00; G01C5/00; G01S17/08
Foreign References:
| CN115235440A | 2022-10-25 | |||
| CN104298245A | 2015-01-21 | |||
| CN101008676A | 2007-08-01 | |||
| CN108872964A | 2018-11-23 | |||
| CN103760565A | 2014-04-30 | |||
| JP2019148436A | 2019-09-05 |
Other References:
RUI-YING ZHANG, YONG PANG, ZENG-YUAN LI, YU-HAI BAO: "Canopy closure estimation in a temperate forest using airborne LiDAR and LANDSAT ETM+ data", CHINESE JOURNAL OF PLANT ECOLOGY, vol. 40, no. 2, 1 January 2016 (2016-01-01), pages 102 - 115, XP093150857, ISSN: 1005-264X, DOI: 10.17521/cjpe.2014.0366
Attorney, Agent or Firm:
CHANGSHA SICHUANG LIANHE INTELLECTUAL PROPERTY LAW FIRM (CN)
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