基于LRO卫星 Diviner热红外发射率的尺度问题研究
投稿时间:2017-11-10  修订日期:2017-12-26  点此下载全文
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作者单位E-mail
马明 吉林大学地球探测科学与技术学院 121303083@qq.com 
陈圣波 吉林大学地球探测科学与技术学院 chensb@jlu.edu.cn 
陆天启 吉林大学地球探测科学与技术学院  
路鹏 吉林大学地球探测科学与技术学院  
肖扬 吉林大学地球探测科学与技术学院  
基金项目:国家自然科学(41372337,3A415AK44423,41772346),科技基础专项项目(2015FY210500)和863计划(2015AA123704)Foundation items:Supported by National Natural Science Foundation of China (41372337,3A415AK44423,41772346), Special project of science and Technology Foundation(2015FY210500), the National High Technology Research and Development Program(
中文摘要:尺度问题作为对地观测的主要挑战和遥感科学的核心问题,一直以来备受关注。国内外学者对这一问题进行了大量的基础理论研究和科学验证工作,探讨和解决了许多与遥感尺度相关的核心问题。但是,目前对于尺度问题内涵和遥感尺度效应的认知依然缺乏足够的认知。当然,在遥感探测内容中,表面发射率和温度遥感中也存在明显的尺度问题。幸运的是,月球为我们研究混合像元发射率尺度问题提供了绝佳的研究对象。同时,伴随着Diviner热辐射探测器月表测量数据的不断更新,这一问题研究及其定量描述逐渐变为可能。本文以月表Diviner红外测量数据为基础,在充分研究和分析Diviner数据特征和发射率计算方法的前提上,以不同尺度下的Apollo 15登月区和登月点热红外发射率为研究对象,依据尺度转换基本规律和混合像元发射率定义,分析和研究了混合像元中发射率的尺度变换和尺度效应两个问题,从发射率数值角度出发讨论和验证了尺度变换和尺度效应的一般规律,并给出定量描述。结果表明,随着混合像元发射率空间分辨率线性降低4倍,一方面,在尺度转换过程中,发射率空间区分度和极大值非线性分别降低13.2倍和17倍,极小值非线性增加11.3倍;另一方面,尺度效应会导致遥感探测范围内物质发射率区分度的降低,并且伴随空间分辨率的不断降低,影响也在不断降低,直至消失。
中文关键词:发射率  Diviner  尺度转换  尺度效应  定量描述
 
Study on Scale Problems Based on the Diviner Thermal Infrared Data of LRO Satellite
Abstract:Scale problems are the main challenge on earth observations and the core problem of remote sensing science which had attracted much attention for many years. A large number of basic theoretical studies and scientific verification work had been done and many core issues correlation with remote sensing scale had been discussed and resolved. However, there is still a lack of enough cognition on the connotation of scale and scale effect now. In remote sensing detecting content, scale problems were certainly consist in the emissivity and temperature measurements which were more reliable and less affected by the atmosphere on the moon. Meanwhile, with the constant updating of the LRO Diviner thermal infrared data, it is possible that the mixed pixels scale problems are studied and quantitatively described. In this paper, firstly, the Diviner thermal infrared data features are adequately analyzed and the calculation method of lunar surface Diviner emissivity is minutely studied. Secondly, the different scales lunar surface emissivity are calculated at the Apollo 15 landing area or point where scale effect problem and scale transformation problem are analyzed and studied based on the basic law of scale transformation and the emissivity definition of mixed pixel. Finally, the general rule of scale transformation and scale effect is discussed and validated from the numerical calculation point of view and quantitative descriptions of scale problems are displayed. These survey results indicate that with the spatial resolution of mixed pixel emissivity reduced by four times, on the one hand, the spatial separation degree and maximum value of lunar surface emissivity decrease nonlinearly 13.2 times and 17 times and minimum value of lunar surface emissivity nonlinearly increase 11.3 times in the scale transformation process, on the other hand, scale effect will lead to the reduction of emissivity separation degree within the detection range of remote sensing and the influence of scale effect will become increasingly weaker or disappearing during the decreasing of spatial resolution.
keywords:Emissivity  Diviner  Scale Transformation  Scale Effect  Quantitative Description
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