干旱区地理2025，Vol.48Issue(9)：1600-1611,12.DOI:10.12118/j.issn.1000-6060.2024.565
基于无人机激光雷达的青海共和盆地藏锦鸡儿(Caragana tibetica)灌丛沙堆形态测算
Morphological calculation of Caragana tibetica nebkhas based on UAV laser radar technology in Gonghe Basin,Qinghai Province
摘要
Abstract
To explore the applicabilities of various estimation formulas for the morphological parameters of re-ported nebkhas and justify their selections,the morphological parameters,such as the bottom area and volume,of 300 Caragana tibetica nebkhas on the west of Longyangxia Reservoir(Gonghe Basin,Qinghai Province,China)were measured using the laser radar technology of an unmanned aerial vehicle(UAV).The results are summa-rized in four points.(1)UAV laser radars can accurately determine the morphologies of C.tibetica nebkhas,ob-taining average relative errors of 0.70%,1.13%,and-1.67%for the length axis(L),width axis(W),and height(H),respectively,with corresponding root-mean-square errors(RMSEs)of 0.02 m,0.03 m,and 0.03 m,respec-tively.Additionally,the RMSEs of the plane and three-dimensional(3D)accuracy of the 3D model were 0.03 m and 0.04 m,respectively,satisfying accuracy requirements.(2)The L,W,and H of the C.tibetica nebkhas re-mained largely unchanged,and their variation coefficients were between 0.26 and 0.33.Additionally,these param-eters exhibited a significant correlation(P<0.01),indicating that the morphologies of the nebkhas were deter-mined by coordinated L,W,and H increases.Additionally,the crust,dead shrubs,and wind erosion pits on the sur-face of the nebkhas indicate that the nebkhas had evolved from the mature stage to the decline stage.(3)The fol-lowing formulas were used to determine the bottom area of the C.tibetica nebkhas:π[(L+W)/4]2,πLW/4,and LW/2,obtaining total relative errors of-0.79%,-1.26%,and-37.14%,respectively.Among them,π[(L+W)/4]2 and πLW/4 were considered suitable for the study area.Further,the following formulas were used to determine their volume:3πLWH/32,πLWH/12,LWH/6,πH{[3(L+W)/4]2+H2}/6,and πLWH/6,with total relative errors of-6.15%,-16.58%,-46.89%,59.14%,and 66.83%,respectively.The modified formula,πLWH/10,yielded a to-tal relative error of 0.10%,as well as a low dispersion degree,making it the most suitable formula for the study ar-ea.In summary,the estimation of the bottom areas and volumes of nebkhas requires the careful consideration of the influence of the vegetation type,development stage,habitat,or sand-source richness,as this would ensure the selection of appropriate estimation methods based on local conditions.关键词
灌丛沙堆/无人机激光点云/几何公式/总相对误差Key words
nebkhas/drone laser point cloud/geometric formula/total relative error引用本文复制引用
尚毅力,李悦,肖锋军,南维鸽,张智,王利杰..基于无人机激光雷达的青海共和盆地藏锦鸡儿(Caragana tibetica)灌丛沙堆形态测算[J].干旱区地理,2025,48(9):1600-1611,12.基金项目
国家自然科学基金项目(42071009,42171004,41930641) （42071009,42171004,41930641）
第二次青藏高原综合科学考察研究(2019QZKK0403) （2019QZKK0403）
科技部科技基础资源调查专项(2022FY202304) （2022FY202304）
陕西省2021年自然科学基础研究计划(定向委托)项目(2021JCW-17)资助 （定向委托）
