基于多级靶标的航空多光谱相机绝对辐射定标  

Absolute Radiometric Calibration of Aerial Multispectral Camera Based on Multi-Scale Tarps

作　　者：崔珍珍 马超[1] 张浩 张宏伟 梁虎军 邱文 CUI Zhen-zhen;MA Chao;ZHANG Hao;ZHANG Hong-wei;LIANG Hu-jun;QIU Wen(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Airborne Remote Sensing Center,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Geoscience and Surveying Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454003 [2]中国科学院空天信息创新研究院航空遥感中心,北京100094 [3]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《光谱学与光谱分析》2023年第11期3571-3581,共11页Spectroscopy and Spectral Analysis

基　　金：中国科学院“地球大数据科学工程”A类战略性先导科技专项(XDA19010402);国家自然科学基金项目(41771397);海南省重大科技计划项目(ZDKJ2019006)资助。

摘　　要：基于场地的绝对辐射定标是航空遥感数据定量化应用的重要保障手段,如何降低外场测量环境及各种测量误差的影响、提高定标结果的稳定性和精度是航空相机定标的关键。利用2020年12月26日—28日在云南普洱定标场布设的5种不同反射率的灰阶靶标,采用反射率基法对机载Lecia DMCⅢ航空多光谱相机连续进行3次辐射定标试验。在飞机飞越定标场上空的同时,获取地表反射率、大气参数和试验场内各采样点的几何信息,利用MODerate resolution atmospheric TRANsmission(MODTRAN)5.2.1大气辐射传输模型得到遥感器入瞳处各波段的辐亮度,然后结合影像选定区域的平均DN值,分别采用单点法、两点法和多点法计算得到不同的定标系数。通过系统对比不同方法得到的定标结果并分析各种误差源,提出了一种基于多级靶标多次观测的航空多光谱相机外场高精度绝对辐射定标的方法,各波段的定标不确定度分别为7.24%(蓝)、6.20%(绿)、5.35%(红)和4.68%(近红外)。为了验证辐射定标的结果,通过反射率反演的方法来验证不同方法计算得到的定标系数的合理性;利用单点法、两点法和多点法得到不同的定标系数,基于Atmospheric/Topographic Correction for Airborne Imagery(ATCOR 4)大气校正软件对试验场内的多种典型地物进行大气校正;将反演的地表反射率与实测地物反射率进行对比验证。结果表明:多级靶标和短期多次试验对于提高定标精度非常关键,5%、20%和60%灰阶靶标单点定标法和单次多点定标法的定标精度相对最差,40%灰阶靶标单点定标法和两点法的定标误差明显减小,多次多点法的定标精度相对较高,三类方法平均相对误差分别为10%、5.43%和3.18%。本文提出的基于多级靶标多次试验的航空多光谱相机定标方法,降低了单点法、两点法及单次试验定标的不确定性,对于今后航空相机的外场高精度定标及�Site-based absolute radiometric calibration is an important guarantee for quantitatively application of aerial remote sensing data.The key to aerial camera calibration is to reduce the influence of field measurement environment and various measurement errors and improve the stability and accuracy of calibration results.In this paper,five gray scale tarps with different reflectance were set up at the Pu er test site in Yunnan Province from 26th to 28th December 2020,and a reflectance-based method,which requires synchronous measurements including the surface reflectance,atmospheric parameters and geometry information when the aircraft overpass the calibration test site,was used for absolute radiometric calibration of Lecia DMCⅢairborne multispectral camera.These parameters were input into the MODerate resolution atmospheric TRANsmission(MODTRAN)atmospheric radiative transfer model to obtain the spectral radiance at the entrance pupil at the aircraft height.Then,combined with the average DN of the selected area of the image,the different absolute radiometric calibration coefficients were derived for the DMCⅢcamera via three consecutive calibration experiments based on single-,dual-and multi-site methods.By systematically comparing the calibration results of single-,dual-and multi-site methods and analyzing various error sources,proposing a high-precision absolute radiometric calibration method based on multiple observations with multi-scale tarps.Moreover,the calibration uncertainty of each band is 7.24%(blue),6.20%(green),5.35%(red)and 4.68%(near infrared),respectively.In order to verify the radiometric calibration results,the reflectance inversion validation was adopted to prove the rationality of the three different calibration coefficients obtained by single-,dual-and multi-site methods.The different absolute calibration coefficients obtained by single-,dual-and multi-site methods were used to conduct atmospheric correction for various typical ground objects in the test site with Atmospheric/Topographic Corr

关 键 词：遥感 绝对辐射定标 多级靶标 反射率基法 验证 

分 类 号：TP722.4[自动化与计算机技术—检测技术与自动化装置]