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Title: Precipitation Effects on the Selection of Suitable Non-variant Targets Intended for Atmospheric Correction of Satellite Remotely Sensed Imagery
Authors: Themistocleous, Kyriacos 
Chrysoulakis, Nektarios 
Retalis, Adrianos 
Michaelides, Silas 
Hadjimitsis, Diofantos G. 
Major Field of Science: Engineering and Technology
Field Category: Civil Engineering
Keywords: Atmospheric correction;Cyprus;Landsat;Reflectance;Precipitation;Spectroradiometer
Issue Date: Sep-2013
Source: Atmospheric Research, 2013, vol. 131, pp. 73-80
Volume: 131
Start page: 73
End page: 80
Journal: Atmospheric Research 
Abstract: One of the most well-established atmospheric correction methods of satellite imagery is the use of the empirical line method using non-variant targets. Non-variant targets serve as pseudo-invariant targets since their reflectance values are stable across time. A recent adaptation of the empirical line method incorporates the use of ground reflectance measurements of selected non-variant targets. Most of the users are not aware of the existing conditions of the pseudo-invariant targets; i.e., whether they are dry or wet. Any omission of such effects may cause erroneous results; therefore, remote sensing users must be aware of such effects. This study assessed the effects of precipitation on five types of commonly located surfaces, including asphalt, concrete and sand, intended as pseudo-invariant targets for atmospheric correction. Spectroradiometric measurements were taken in wet and dry conditions to obtain the spectral signatures of the targets, from January 2010 to May 2011 (46 campaigns). An atmospheric correction of eleven Landsat TM/ETM + satellite images using the empirical line method was conducted. To identify the effects of precipitation, a comparison was conducted of the atmospheric path radiance component for wet and dry conditions. It was found that precipitation conditions such as rainfall affected the reflectance values of the surfaces, especially sand. Therefore, precipitation conditions need to be considered when using non-variant targets in atmospheric correction methods.
ISSN: 0169-8095
DOI: 10.1016/j.atmosres.2012.02.015
Rights: © Elsevier
Type: Article
Affiliation : Meteorological Service of Cyprus 
Institute of Applied and Computational Mathematics 
National Observatory of Athens 
Cyprus University of Technology 
Appears in Collections:Άρθρα/Articles

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