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

Remote Sensing

Vincent O. Odongo²  Nicholas A. S. Hamm¹ 

[1] Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, P.O. Box 217, 7514 AE Enschede, The Netherlands; E-Mail:;Geography & Environment, University of Southampton, Southampton, Hampshire SO17 1BJ, UK; E-Mail:

关键词: vicarious calibration;    validation;    spatial variation;    radiometry;    Getis statistic;   

DOI  :  10.3390/rs6032494

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland