This study aims to assess and to evaluate band ratios,
brovey and HSV (Hue-Saturation-Value) techniques for discrimination and mapping
the basement rock units exposed at Wadi Bulghah area, Saudi Arabia using multispectral
Landsat ETM+ and SPOT-5 panchromatic data. FieldSpec instrument is
utilized to collect the spectral data of diorite, marble, gossan and volcanics,
the main rock units exposed at the study area. Spectral profile of diorite
exhibitsvery distinguished absorption features around 2.20μm and
2.35μm wavelength regions. These absorption features lead to lowering the
band ratio values within the band-7 wavelength region. Diorite intrusions
appear to have grey and dark grey image signatures on 7/3 and 7/2 band ratio
images respectively. On the false color composite ratio image (7/3:R; 7/2:G and
5/2:B), diorite, marble, gossan and volcanics have very dark brown, dark
blue, white and yellowish brown image signaturesrespectively. Image
fusion between previously mentioned FCC ratioimageand high
spatial resolution (5meters) SPOT-5 panchromatic image is carried out by using brovey and HSV transformation
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