Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/67349
Title: A simple and effective retrieval of land surface temperature using a new reflectance based emissivity estimation technique
Authors: Nithiyanandam, Y
Nichol, JE 
Keywords: Land surface temperature
Emissivity
ASTER
Urban Heat Island
Hong Kong
TES
Issue Date: 2016
Publisher: Copernicus GmbH
Source: International archives of the photogrammetry, remote sensing and spatial information sciences, 2016, v. 41, no. B8, p. 443-447 How to cite?
Journal: International archives of the photogrammetry, remote sensing and spatial information sciences 
Abstract: Emissivity is a significant factor in determining land surface temperature (LST) retrieved from the thermal infrared (TIR) satellite images. A new simplified method (reflectance method) for emissivity correction was developed in this study while estimating emissivity values at a spatial resolution of 30 m from the radiance values of the SWIR image. This in turn enables mapping surface temperatures at a much finer spatial resolution (30 m). Temperatures so estimated are validated against surface temperatures measured in the ground by thermocouple data loggers recorded during satellite overpass time. In this study, surface emissivity values are derived directly from the AST_L1B images. The reflectance method estimates temperature at higher spatial resolution of 30 m when compared to the 90 m spatial resolution of TES and reference channel methods. Temperature determined for the daytime image of 30th November 2007 using different emissivity techniques was compared with the temperatures measured on the field using thermocouple data loggers. It is observed that the estimates from the reflectance method are much closer to the field measurements than the TES and reference channel methods. The temperature difference values range from 0.2 to 2.3 degrees C, 0.15 to 5.6 degrees C, and 2.6 to 8.6 degrees C for the reflectance method, normalization method and reference channel method, respectively. The new reflectance emissivity techniques i.e. reflectance method exhibits the least deviation from the field measured temperature values. While considering the accuracy of data logger (1 degrees C) the reflectance method enables one to map surface temperature precisely than other two methods.
Description: 23rd Congress of the International Society for Photogrammetry and Remote Sensing (ISPRS), Prague, Czech Republic, July 12-19, 2016
URI: http://hdl.handle.net/10397/67349
ISSN: 1682-1750
EISSN: 2194-9034
DOI: 10.5194/isprsarchives-XLI-B8-443-2016
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