Calibration of ASTER and ETM + imagery using empirical line method—A case study of north-east of Hajjah, Yemen |
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| Authors: | Ali M Qaid H T Basavarajappa S Rajendran S A Ashfaq Junfeng Xu |
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| Institution: | (1) Department of Studies in Geology, University of Mysore, Manasagangotri, Mysore, 570 006, India |
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| Abstract: | This study is aimed at using the Empirical Line Method (ELM) to eliminate atmospheric effects with respect to visible and
near infrared bands of advanced spaceborne thermal emission and reflection radiometer (ASTER) and enhanced thematic mapper
plus (ETM+) data. Two targets (Amran limestone as light target and quartz-biotite-sericite-graphite schists as dark target),
which were widely exposed and easy to identify in the imagery were selected. The accuracy of the atmospheric correction method
was evaluated from three targets (vegetation cover, Amran limestone and Akbra shale) of the surface reflectance. Analytical
spectral devices (ASD) FieldSpec3 was used to measure the spectra of target samples. ETM+ data were less influenced by the
atmospheric effect when compared to ASTER data. Normalized differences vegetation indices (NDVI) displayed good results with
reflectance data when compared with digital number (DN) data because it is highly sensitive to ground truth reflectance (GTR).
Most of the differences observed before and after calibration of satellite images (ASTER and ETM+) were absorbed in the SWIR
region.
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| Keywords: | ELM ASTER ETM+ GTR FieldSpec3 |
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