广西林业科学 ›› 2024, Vol. 53 ›› Issue (1): 10-17.DOI: 10.19692/j.issn.1006-1126.20240102

• 研究论文 • 上一篇    下一篇

基于无人机多光谱的高山松地上生物量估测

杨正道1, 舒清态1, 黄金君2, 周文武1, 胥丽1, 罗绍龙1, 王书伟1   

  1. 1.西南林业大学 林学院,云南昆明 650224;
    2.广西壮族自治区中国科学院广西植物研究所,广西桂林 541006
  • 收稿日期:2023-08-21 出版日期:2024-02-29 发布日期:2024-03-07
  • 通讯作者: 舒清态(1970 — ),男,博士,教授,主要从事森林生物量遥感估测研究。
  • 作者简介:杨正道(1998 — ),男,硕士研究生,主要从事森林生物量遥感估测研究。
  • 基金资助:
    国家自然科学基金项目(31860205,31460194)

Estimation of Pinus densata Above-ground Biomass Based on UAV Multi-spectrum

Yang Zhengdao1, Shu Qingtai1, Huang Jinjun2, Zhou Wenwu1, Xu Li1, Luo Shaolong1, Wang Shuwei1   

  1. 1. College of Forestry, Southwest Forestry University, Kunming, Yunnan 650224, China;
    2. Guangxi Institute of Botany, Chinese Academy of Sciences, Guilin, Guangxi 541006, China
  • Received:2023-08-21 Online:2024-02-29 Published:2024-03-07

摘要: 以机载数据替代卫星影像的方式提高森林生物量估测精度,是目前林业遥感研究的重点领域。以高山松(Pinus densata)林为研究对象,进行无人机(Unmanned Aerial Vehicle,UAV)多光谱影像数据采集;结合36块样地实测数据,采用变异函数确定高山松地上生物量最佳观测窗口;提取并筛选出相关性较强的5个因子,分别建立PLS和RF模型,对飞行区高山松地上生物量进行估测。结果表明,高山松地上生物量最佳观测窗口为球状模型的变程α值5.2 m;RF模型(R2=0.90、RMSE=17.96 t/hm2P=84.98%)优于PLS模型(R2=0.55、RMSE=38.94 t/hm2P=71.13%);基于RF模型,飞行区高山松地上生物量均值为130.48 t/hm2,总生物量为8 343.53 t。

关键词: 无人机, 变异函数, 生物量, 高山松

Abstract: Using airborne data instead of satellite images to improve accuracy of forest biomass estimation is key field of forestry remote sensing research. UAV multi-spectral image data acquisition was carried out in Pinus densata forests. Based on measured data of 36 sample sites, the best observation window for P. densata above-ground biomass was determined by variance function. Five factors with strong correlations were extracted and screened, and PLS and RF models were established respectively to estimate P. densata above-ground biomass in flight area. Results showed that the best observation window for P. densata above-ground biomass was variable range α value of 5.2 m in spherical model. RF model (R2=0.90, RMSE=17.96 t/hm2, P=84.98%) was superior to PLS model (R2=0.55, RMSE=38.94 t/hm2, P=71.13%). Based on RF model, average P. densata above-ground biomass in flight area was 130.48 t/hm2, and total biomass was 8 343.53 t.

Key words: UAV, variance function, biomass, Pinus densata

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