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Remote Sens. 2014, 6(3), 2494-2513; doi:10.3390/rs6032494

Spatio-Temporal Assessment of Tuz Gölü, Turkey as a Potential Radiometric Vicarious Calibration Site

1
Geography & Environment, University of Southampton, Southampton, Hampshire SO17 1BJ, UK
2
Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, P.O. Box 217, 7514 AE Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 15 November 2013 / Revised: 5 March 2014 / Accepted: 10 March 2014 / Published: 20 March 2014
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Abstract

The paper provides an assessment of Tuz Gölü, a site in Turkey proposed for the radiometric vicarious calibration of satellite sensors, in terms of its spatial homogeneity as expressed in visible and near-infrared (VNIR) wavelengths over a 25-year period (1984–2009). By combining the coefficient of variation (CV) and Getis statistic (Gi*), a spatially homogenous and temporally stable area at least 720 m × 330 m in size was identified. Analysis of mid-summer Landsat Thematic Mapper (TM) images acquired over the period 1984–2009 showed that the hemispherical-directional reflectance factor of this area had a spatial variability, as defined by the CV, in the range of 0.99% to 3.99% in Landsat TM bands 2–4. This is comparable with the reported variability of other test sites around the world, but this is the first time an area has been shown to have this degree of homogeneity over such a long period of time. View Full-Text
Keywords: vicarious calibration; validation; spatial variation; radiometry; Getis statistic vicarious calibration; validation; spatial variation; radiometry; Getis statistic
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Odongo, V.O.; Hamm, N.A.S.; Milton, E.J. Spatio-Temporal Assessment of Tuz Gölü, Turkey as a Potential Radiometric Vicarious Calibration Site. Remote Sens. 2014, 6, 2494-2513.

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