- Author
- Thomas Abraham (The Council for Geoscience, Pretoria, South Africa,)
- Title
- Processing and Analysis of ASTER and Landsat 8 Scenes to Aid in Geological Mapping: A Case Study of Murchison Greenstone Belt Area, South Africa
Przetwarzanie i analiza obrazów zarejestrowanych przez ASTER oraz Landsat 8 w celu wspomagania tworzenia map geologicznych: studium przypadku obszaru Murchison Greenstone Belt, Republika Południowej Afryki - Source
- Geomatics and Environmental Engineering, 2020, nr 14/3, s. 107-123, fot., rys., tab., bibliogr. 23 poz.
- Keyword
- Geologia, Kartografia, Systemy satelitarne
Geology, Cartography, Satellite systems - Country
- Afryka Południowa
South Africa - Abstract
- W artykule przedstawiono wyniki przetwarzania i analizy obrazów zarejestrowanych przez satelity ASTER oraz Landsat 8. Czynności te wykonane zostały w celu sporządzenia mapy geologicznej dla regionu Murchison Greenstone Belt w prowincji Limpopo, w Afryce Południowej. Zdjęcia wykonane przez ASTER pochodzą z lat 2005 i 2006, natomiast te zarejestrowane przez Land-sat 8 z 2019 roku. Analizowane zdjęcia zostały tak dobrane, aby obejmowałyby obszar odpowiadający pięciu arkuszom mapy geologicznej. Eksperymentowano z wykorzystaniem oprogramowania ENVI i SNAP w celu stworzenia obrazów, które byłyby pomocne w zidentyfikowaniu makroskopowych cech skał, ich struktury, linii nieciągłości, przeobrażeń minerałów i tlenku żelaza, linii pomiędzy lądem i wodą, cech powierzchni, pokrycia roślinnością, wegetacji roślin etc. Korzystając z danych DEM, przygotowano obrazy przedstawiające rzeźbę terenu, które pozwoliły na określenie wysokości terenu, niektórych cech strukturalnych i linii szkieletowych. Wszystkie obrazy zostały później wyeksportowane do plików w formatach GeoTiff i Imagine w celu wyświetlenia ich w ArcMap. Obrazy te okazały się przydatne w rozróżnianiu cech geologicznych i konstrukcyjnych oraz wysokości obiektów, w tym wałów, które nie są dobrze widoczne na obrazach w naturalnych kolorach. Badanie to potwierdza przydatność analizy teledetekcyjnej w tworzeniu map geologicznych z wykorzystaniem swobodnie dostępnych danych z satelitów ASTER i Landsat 8. (abstrakt oryginalny)
This paper presents processing and analysis results of ASTER and Landsat 8 scenes to aid in geological mapping of Murchison Greenstone Belt region of Limpopo Province, South Africa. Images of ASTER acquired in 2005 and 2006 and Landsat 8 acquired in 2019 were downloaded and subset covering 5 mapping sheets was extracted. Images of different band ratios and band combinations were experimented using ENVI and SNAP software to identify suitable band/band ratio combinations to produce FCCs that enabled discrimination of lithology, structural features, lineaments, alteration and iron oxides, land/water, surface features, vegetation cover and healthy vegetation etc. Using DEM data, slope and shaded relief were also prepared that enabled the identification of the extent of protruded outcrops, some structural features and lineaments using different FCC displays. These datasets prepared in ENVI file format were later exported to GeoTiff/Imagine file for display in ArcMap by the mapping geologists. FCCs made in various band combinations, ratio combination and also with slope are useful in discriminating geology, structural features and protruded outcrops including dykes that are not so visible in a true colour image of the same resolution. This study could illustrate the usefulness of remote sensing analysis to aid in geological mapping using freely available ASTER and Landsat 8 data. (original abstract) - Full text
- Show
- Bibliography
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- Cited by
- ISSN
- 2300-7095
- Language
- eng
- URI / DOI
- http://dx.doi.org/10.7494/geom.2020.14.3.107