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Title: The Identification of Pseudo-invariant Targets Using Ground Field Spectroscopy Measurements Intended for the Removal of Atmospheric Effects From Satellite Imagery: a Case Study of the Limassol Area in Cyprus
Authors: Retalis, Adrianos 
Themistocleous, Kyriacos 
Chrysoulakis, Nektarios 
Hadjimitsis, Diofantos G. 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering
Keywords: Mss;Empirical line method;Radiometric calibration;Landsat-7 etm+;Reflectance;Derivation;Tm;Retrieval;Sensors;Remote sensing;Imaging science and photographic technology
Issue Date: 29-Jun-2012
Source: International Journal of Remote Sensing, 2012, vol. 33, no. 22, pp. 7240-7256
Volume: 33
Issue: 22
Start page: 7240
End page: 7256
Journal: International Journal of Remote Sensing 
Abstract: This study proposes five types of commonly located surfaces that were evaluated to be determined for use as pseudo-invariant targets (PITs) in order to apply the so-called `empirical-line' atmospheric correction method. Spectroradiometric measurements were taken over wet and dry conditions to obtain the spectral signatures of the targets. From the acquired in situ spectroradiometric campaign, it was found that the proposed commonly found PITs (sandy, concrete and asphalt) are suitable non-variant targets. An accuracy assessment of the empirical-line atmospheric correction method using the five PITs was performed using other calibration targets and aerosol optical thickness (AOT) values from MICROTOPS hand-held sun photometers acquired simultaneously with the satellite overpass. The radiative transfer equation was used to determine AOT levels, using the reflectance values derived from the empirical-line method, in order to conduct an accuracy assessment with in situ AOT measurements. It was also shown that precipitation conditions should be considered when using non-variant targets in atmospheric correction methods.
Description: The authors would like to acknowledge the Cyprus University of Technology for the internal funding of this work. The work presented in this study is part of Kyriacos Themistocleous's PhD thesis entitled `Improving atmospheric correction methods for aerosol optical thickness retrieval supported by in-situ observations and GIS analysis'.
ISSN: 13665901
DOI: 10.1080/01431161.2012.700425
Rights: @ 2012 Taylor & Francis
Type: Article
Affiliation : National Observatory of Athens 
Cyprus University of Technology 
Appears in Collections:Άρθρα/Articles

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