Development of an improved urban emissivity model based on sky view factor for retrieving effective emissivity and surface temperature over urban areas

	Development of an improved urban emissivity model based on sky view factor for retrieving effective emissivity and surface temperature over urban areas
	Yang, Jinxin 1; Wong, Man Sing 1; Menenti, Massimo 1; Nichol, Janet 1; Voogt, James 1; Krayenhoff, E. Scott 1; Chan, P.W.1
刊名	ISPRS Journal of Photogrammetry and Remote Sensing
	2016
卷号	122 页码:30-40
关键词	VARIABLE IMPORTANCE MEASURES RESOURCE LIMITATIONS MODEL ICESAT LASER ALTIMETRY VEGETATION INDEXES VERTICAL STRUCTURE MULTISENSOR LIDAR ELEVATION DATA NEW-HAMPSHIRE TREE COVER BIOMASS
通讯作者	Wong, Man Sing (lswong@polyu.edu.hk)
英文摘要	This study aims to evaluate the effects of urban geometry on retrieval of emissivity and surface temperature in urban areas. An improved urban emissivity model based on sky view factor (IUEM-SVF) was further enhanced to consider all radiance contributions leaving the urban canopy, including (i) emission by all facets within an instantaneous field of view (IFOV); (ii) reflection by all facets of emission from surrounding facets; and (iii) propagation of emitted and reflected radiation with multiple reflections (scattering) within a complex 3D array of urban objects. The effective emissivity derived from IUEM-SVF was evaluated with a microscale radiative transfer and energy balance model: Temperatures of Urban Facets in 3-D (TUF-3D). IUEM-SVF performs well when urban facets have uniform emissivity and temperature; e.g., root mean square deviations (RMSD) are less than 0.005 when material emissivity is larger than 0.80 ( 0.80). However, when material emissivities are variable within the observed target, differences of effective emissivity between IUEM-SVF and TUF-3D become larger, e.g., RMSD of 0.010. When the effect of geometry is not considered and a mixed pixel emissivity is defined, the difference is even much larger (i.e. 0.02) and this difference increases with the decrease of sky view factor. Thus, the geometry effect should be considered in the determination of effective emissivity. Effective emissivity derived from IUEM-SVF was used to retrieve urban surface temperature from a nighttime ASTER thermal infrared image. Promising results were achieved in comparison with standard LST products retrieved with the Temperature and Emissivity Separation (TES) algorithm. IUEM-SVF shows promise as a means to improve the accuracy of urban surface temperature retrieval. The effect of thermal heterogeneity on the effective emissivity was also evaluated by TUF-3D, and results show that the thermal heterogeneity cannot be neglected since the RMSD between the effective emissivity based on TUF-3D and IUEM-SVF is relatively large. © 2016 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS)
学科主题	Physical Geography; Geology; Remote Sensing; Imaging Science & Photographic Technology
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:20164603007430
内容类型	期刊论文
源URL	[http://ir.radi.ac.cn/handle/183411/39484]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	1. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Kowloon, Hong Kong 2. Faculty of Civil Engineering and Earth Sciences, Delft University of Technology, P.O. Box 5048, GA Delft 3.2600, Netherlands 4. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 5.100101, China 6. Department of Geography, University of Western Ontario, London 7.ON 8.N6A 5C2, Canada 9. Hong Kong Observatory, Hong Kong
推荐引用方式 GB/T 7714	Yang, Jinxin,Wong, Man Sing,Menenti, Massimo,et al. Development of an improved urban emissivity model based on sky view factor for retrieving effective emissivity and surface temperature over urban areas[J]. ISPRS Journal of Photogrammetry and Remote Sensing,2016,122:30-40.
APA	Yang, Jinxin.,Wong, Man Sing.,Menenti, Massimo.,Nichol, Janet.,Voogt, James.,...&Chan, P.W..(2016).Development of an improved urban emissivity model based on sky view factor for retrieving effective emissivity and surface temperature over urban areas.ISPRS Journal of Photogrammetry and Remote Sensing,122,30-40.
MLA	Yang, Jinxin,et al."Development of an improved urban emissivity model based on sky view factor for retrieving effective emissivity and surface temperature over urban areas".ISPRS Journal of Photogrammetry and Remote Sensing 122(2016):30-40.