无人机热红外遥感正射影像的质量评价  

Quality evaluation of UAV thermal infrared remote sensing orthophoto image

作　　者：唐枭 陈艳 汪明有 楼昊煜 Tang Xiao;Chen Yan;Wang Mingyou;Lou Haoyu(Jiangxi Geological Survey and Exploration Institute,Nanchang 330009,Jiangxi,China;The Plant Accelerator,University of Adelaide,Adelaide 5064,South Australia,Australia)

机构地区：[1]江西省地质调查勘查院,江西南昌330009 [2]阿德莱德大学植物表型研究中心,南澳大利亚阿德莱德5064

出　　处：《地质学刊》2024年第3期279-284,共6页Journal of Geology

基　　金：江西省地质项目“遥感方法在地热资源调查与预测中的应用”(赣地矿字〔2018〕51号、赣地矿字〔2020〕16号)。

摘　　要：随着无人机遥感技术的发展,无人机搭载热红外镜头的应用逐渐广泛,无人机热红外遥感正射影像的质量评价日渐重要,通过优化无人机热红外影像的拼接流程,以满足不同领域的应用需求,尤其是通过无人机探测地表热异常来指导地热找矿。采用主观和客观评价方法,提取信息熵、方差、标准差和温度值,计算图像的平均梯度,比较同一架次影像经不同拼接软件处理后的热红外影像质量。以江西赣州建节村为研究区,使用大疆无人机搭载FLIR热红外镜头,对圈定区域开展飞行作业,重点比较Pix4D与PhotoScan对热红外影像的拼接效果。结果表明,PhotoScan在影像信息量保持度和拼接后的清晰度方面均优于Pix4D,且其热红外影像更接近原始温度值;Pix4D在影像完整度和整体协调度方面表现更为优异,更适用于地热找矿项目中的靶区优选。With the advancement of unmanned aerial vehicle(UAV)remote sensing technology,the application of UAVs equipped with thermal infrared lenses has gradually expanded,and the quality assessment of UAV thermal infrared orthophotos has grown increasingly crucial.This research aims to optimize the stitching process of UAV thermal infrared images to fulfill the application requirements of various fields,particularly in guiding geothermal prospecting through the detection of surface thermal anomalies by UAVs.The study employs both subjective and objective methods for evaluation.By extracting information entropy,variance,standard deviation,and temperature values,and calculating the average gradient of the images,the quality of thermal infrared images processed by different stitching software for the same flight mission is compared.The study area is located in Jianjie Village,Ganzhou,Jiangxi Province.A DJI UAV equipped with FLIR thermal infrared lens was used to conduct flight operations in the delineated area,with a focus on comparing the performance of Pix4D and PhotoScan in thermal infrared image stitching.The results indicate that PhotoScan outperforms Pix4D in terms of the retention of image information and the clarity after stitching,and its thermal infrared images are closer to the originally acquired temperature values.Conversely,Pix4D demonstrates superior performance in image completeness and overall coordination,making it more applicable for the selection of target areas in geothermal prospecting projects.

关 键 词：无人机 热红外遥感 影像拼接 质量评价 平均梯度 江西赣州 

分 类 号：P627[天文地球—地质矿产勘探]