University of Twente Student Theses


Applicability of wavelength mapping method for the interpretation of hyperspectral images the Nili Fossae region of Mars

Omer, Zulfa Abdurahman (2013) Applicability of wavelength mapping method for the interpretation of hyperspectral images the Nili Fossae region of Mars.

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Abstract:Mars is an Earth-like planet having various mineralogical compositions associated with different rocks which are the results of different processes occurring on Mars. Understanding the surface mineralogy of Mars is the key to explore the history of Mars. However since there is no mechanism of ground-truthing of mineral mapping of Mars, spectroscopic remote sensing is the only way for exploring and understanding Mars. Observatoire pour la Mine’ralogie, l’Eau, les Glaces et l’Activite´ (OMEGA) images of Mars which have been collected by the OMEGA hyperspectral sensor have been processed and interpreted to identify surface minerals of Mars. These images have a low resolution and may contain noise from various sources. This research aims at investigate the applicability of the wavelength mapping method for interpreting OMEGA imagery for surface mineral identification of the Nili Fossae region of Mars. To achieve this objective the image has been preprocessed. The wavelength mapping method has been applied in order to take the advantage of the spectral as well as the spatial information content of the image and make the interpretation easier by making wavelength regions which represent different minerals. Subsequently the resulting wavelength regions which show some spatial patter have been used to interpret the image by creating regions which give enough information rather than concentrating on single pixel information and also to get better spectra having deep absorption features. These regions are used to aggregate the pixels and obtain mean spectra which can be compared with library spectra of USGS. On the other hand the wavelength map has been used in combination with MOLA data to observe the stratigraphic relationship between the minerals of the area. Finally the OMEGA image has been compared with CRISM images for validation purpose. The result of the visual spectral comparison of the OMEGA image with library spectra of USGS showed similarity with candidate minerals: saponite, sepiolite, kaolinite and montmorillonite. In addition the comparison of OMEGA image with MOLA data (3D view map and geomorphologic map) shows the stratigraphic sequence of the minerals which have been identified from the spectral matching of OMEGA image and library spectra. The comparison of the spectra of OMEGA image with the spectra of CRISM images shows good correlation in the wavelength regions between 2.30-2.35 μm and also 2.20-2.25 μm. In general the wavelength mapping method has been illustrated to be applicable for the interpretation of OMEGA image in the Nili Fossae region of Mars. Key words: Mars, OMEGA, CRISM, Wavelength Mapping, MOLA, geomorphology
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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