基于多角度实测的湖冰BRDF特性研究  

Investigation of BRDF characteristics of lake ice based on multi-angle field measurements

作　　者：肖扬 李略 杨倩[1,2] 刘焕军 郝晓华[3] 林楠 XIAO Yang;LI Lüe;YANG Qian;LIU Huanjun;HAO Xiaohua;LIN Nan(College of Surveying,Mapping and Exploration Engineering,Jilin Jianzhu University,Changchun 130118,China;State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,吉林长春130118 [2]中国科学院东北地理与农业生态研究所,黑土地保护与利用全国重点实验室,吉林长春130102 [3]中国科学院西北生态环境资源研究院,遥感与地理信息科学研究室,甘肃兰州730000

出　　处：《冰川冻土》2025年第1期282-293,共12页Journal of Glaciology and Geocryology

基　　金：吉林省科技厅发展计划项目(YDZJ202301ZYTS212);国家自然科学基金项目(U22A20564)资助。

摘　　要：双向反射分布函数(Bidirectional Reflectance Distribution Function,BRDF)描述地表反射的各向异性分布特征,是定量遥感研究的重要参数。本研究利用ASD Field Spec 4便携式地物光谱仪和多角度观测支架采集查干湖冰封期不同类型积雪和湖冰BRDF,并利用Savitzky-Golay滤波法处理光谱数据,基于地面观测数据分析黑冰、白冰、灰冰、蓝冰和雪的BRDF反射特性,同时探索气泡及杂质对冰雪BRDF反射光谱特性的影响。结果显示,湖冰和积雪表面反射率随天顶角的增加而增加,当方位角为0°和45°时,呈现出明显的各向异性。不同种类的湖冰光谱反射率具有共同的变化特征:当波长位于350~600 nm,湖冰反射率随波长的增大而增大,在600 nm附近反射率达到峰值;当波长位于600~1300 nm,反射率随波长增大而减小,直至完全被吸收。对比不同气泡大小的黑冰光谱特性发现,气泡主要影响350~1000 nm范围内的反射率,气泡的存在增加了黑冰反射率。本研究旨在为湖冰遥感反演算法提供实测数据和机理研究。The Bidirectional Reflectance Distribution Function(BRDF)characterizes the anisotropic distribution of surface reflectance and is a key parameter in quantitative remote sensing studies.In this study,BRDF measurements of different types of snow and lake ice during the ice-covered period of Chagan Lake were collected using an ASD Field Spec 4 portable spectroradiometer and a multi-angle observation mount.Spectral data were processed using the Savitzky-Golay filtering method.Based on ground observations,the BRDF reflectance characteristics of black ice,white ice,gray ice,blue ice,and snow were analyzed,and the effects of bubbles and impurities on the BRDF reflectance spectra of ice and snow were explored.The results show that the reflectance of lake ice and snow increases with the zenith angle,exhibiting distinct anisotropy when the azimuth angles are 0°and 45°.The spectral reflectance of different types of lake ice follows a common trend:between 350~600 nm,reflectance increases with wavelength,peaking around 600 nm;between 600~1300 nm,reflectance decreases with increasing wavelength,eventually being fully absorbed.A comparison of black ice spectral properties with varying bubble sizes revealed that bubbles primarily affect reflectance in the 350~1000 nm range,with their presence leading to an increase in black ice reflectance.This study provides empirical data and insight into the mechanisms for remote sensing inversion algorithms of lake ice.

关 键 词：湖冰 积雪 双向反射分布函数 地面观测 反射光谱特性 

分 类 号：P407[天文地球—大气科学及气象学]