激光雷达回波强度数据辐射特性分析
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摘要
激光雷达回波强度数据记录表征地物目标辐射特性的信息。利用该数据进行地物目标提取以及遥感定量化应用,逐渐成为激光雷达技术领域的研究热点。从激光雷达辐射传输机理出发,构建具有明确物理意义的激光雷达回波强度数据辐射传输机理方程;基于该方程,系统地探讨和分析激光雷达回波强度数据的辐射特征和关键影响因素;利用搭建的激光雷达实验平台对激光雷达辐射特性进行验证和讨论。本研究为开展激光雷达辐射定标、地物分类和各种定量化应用提供必要的理论依据和技术支持。
The intensity data of the echo record the information about the radiometric characteristics of the object and can be effectively used in the object extraction and other remote sensing quantitative applications. Therefore the study on radiometric characteristics of intensity data has become a new hot spot in the field of LiDAR. The radar equation is studied on the basis of the theoretical derivation of radiation transmission mechanism, and the radiation properties and key influences of intensity data are systematically discussed and analyzed. Finally, these theories are verified and discussed by using the experimental platform of LiDAR system. The results and conclusions provide the necessary theoretical basis and technical support for radiometric calibration, object classification, and other quantitative applications of the waveform data.
The intensity data of the echo record the information about the radiometric characteristics of the object and can be effectively used in the object extraction and other remote sensing quantitative applications. Therefore the study on radiometric characteristics of intensity data has become a new hot spot in the field of LiDAR. The radar equation is studied on the basis of the theoretical derivation of radiation transmission mechanism, and the radiation properties and key influences of intensity data are systematically discussed and analyzed. Finally, these theories are verified and discussed by using the experimental platform of LiDAR system. The results and conclusions provide the necessary theoretical basis and technical support for radiometric calibration, object classification, and other quantitative applications of the waveform data.
引文
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[2] Schmidt A,Rottensteiner F,S?rgel U.Water-land-classification in coastal areas with full waveform lidar data[J].Photogrammetrie - Fernerkundung - Geoinformation,2013(2):71-81.
[3] Yan W Y,Shaker A,El-Ashmawy N.Urban land cover classification using airborne LiDAR data:a review[J].Remote Sensing of Environment,2015,158:295-310.
[4] 谭凯,程效军,张吉星.TLS强度数据的入射角及距离效应改正方法[J].武汉大学学报(信息科学版),2017,42(2):223-228.
[5] Xu T,Xu L,Yang B,et al.Terrestrial laser scanning intensity correction by piecewise fitting and overlap-driven adjustment[J].Remote Sensing,2017,9(11):1 090.
[6] Wagner W.Radiometric calibration of small-footprint full-waveform airborne laser scanner measurements:basic physical concepts[J].ISPRS Journal of Photogrammetry and Remote Sensing,2010,65(6):505-513.
[7] Baltsavias E P.Airborne laser scanning:basic relations and formulas[J].ISPRS Journal of Photogrammetry and Remote Sensing,1999,54(2):199-214.
[8] Haner D A,Kavaya M J,Flamant P H,et al.Target reflectance measurements for calibration of lidar atmospheric backscatter data[J].Appl Opt,1983,22(17):2 619.
[9] Wagner W,Ullrich A,Ducic V,et al.Gaussian decomposition and calibration of a novel small-footprint full-waveform digitising airborne laser scanner[J].ISPRS Journal of Photogrammetry and Remote Sensing,2006,60(2):100-112.
[10] 李磊,胡以华,赵楠翔,等.激光遥感目标回波脉宽展宽特性实验[J].红外与激光工程,2010,39(2):246-250.
[11] Schaepman-Strub G,Schaepman M E,Painter T H,et al.Reflectance quantities in optical remote sensing:definitions and case studies[J].Remote Sensing of Environment,2006,103(1):27-42.
[12] 全国遥感技术标准化技术委员会.机载激光雷达点云数据质量评价标准及计算方法:GB/T 36100—2018[S].北京:中国标准出版社,2018:9.