摘要
地表发射率是热红外遥感中的重要参量,也是辐射传输中的重要参数。基于MOD11B1卫星遥感图像数据,利用HDF插件获取典型地表温度参数,具体包括沙地、黄土、草坪、江水、冰面和雪地。在ENVI Classic软件环境下,针对2015年12月至2016年8月不同区域、不同季节的典型地表进行6个热红外波段发射率数据获取,研究不同季节典型地表的发射率随波长以及温度的变化规律。研究结果表明:冬季典型地表发射率参数最高且变化范围小在0. 02内。沙地的发射率数值平均在0. 870~0. 990之间;草坪、黄土和江水的发射率数值平均在0. 910~0. 990之间,冰面和雪地的发射率数值平均在0. 965~0. 985之间。草坪、沙地、黄土、江水、雪地和冰面地表发射率在波长3~5μm范围内随温度成波浪型分布;草坪、江水、雪地和冰面地表发射率在波长8~12μm范围内随温度不变化。
The emissivity is a physical quantity that represents the physical surface radiation ability and is an important parameter in radiation transmission and infrared remote sensing. The optical characteristics of surface emissivity have been studied by means of the variation of the emissivity rate of typical surface in different seasons with various w avelength and temperature. Here the typical surfaces include grass,sand,loess,river,snow and ice. By summarizing the relevant literatures and analyzing the measurement methods of emissivity,a method to obtain surface emissivity and surface temperature was proposed based on the data of MOD11 B1. The emissivity rates of six thermal infrared bands in different regions and seasons were inverted under the ENVI Classic softw are environment from December 2015 through August 2016. The line charts of 11 340 indicator samples were draw n to analyze the variation trend of surface emissivity with w avelength. Using the HDF plug-in to read the typical surface temperature parameters,1 890 data points of the surface temperature were obtained according to the missing data of the linear fitting supplement. The relationship betw een emissivity and temperature was analyzed by using Origin to draw the surface emissivity curves changing with temperature. The results show ed that the typical surface emissivity parameter in w inter is the maximum,with a changing range less than 0. 02. The emissivity rate from grass,loess and river water is in betw een 0. 910 and 0. 990,and that of sand is in betw een 0. 87 and 0. 99.The emissivity of ice and snow is in betw een 0. 965 and 0. 985 in average. The change of surface emissivity of grass,sand,loess,river,surface of snow and ice with temperature was in a w avy form within the w ave range of3 - 5 μm. But the surface emissivity of grass,water,snow and ice surface do not change with temperature significantly in the w ave length range of 8 - 12 μm.
作者
顾吉林
刘淼
汤宏山
GU Jilin;LIU Miao;TANG Hongshan(School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China)
出处
《冰川冻土》
CSCD
北大核心
2018年第4期784-791,共8页
Journal of Glaciology and Geocryology
基金
大连市高层次人才创新支持计划项目(2017RQ141)
国家自然科学基金项目(11547234)
辽宁省创新创业教育改革试点专业项目
辽宁省普通高等教育本科教学改革研究项目"虚拟结合应用型物理实验教学体系的构建与实践"资助
