ASTER data analysis applied to mineral and geological mapping in North East Greenland. Documentation of the NEG ASTER Project

Sara Salehi, Símun D. Olsen, Christian B. Pedersen, Leif Thorning

Publikation: Bog/rapportRapport (offentligt tilgængelig)

Abstrakt

The purpose of this report is to document the processing of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data that has been carried out for primary geological mapping in North East Greenland in the context of NEG ASTER project. The investigated area (73.8° to 75.8° N) is approximately 80.000 km2 and is covered by 1:1.000.000, 1:500.000 and 1:250.000 scale geological maps (Henriksen 1997, Escher 2001, Henriksen 2003, Christoffersen and Jepsen 2007).

The Ministry of Minerals and Resources (MMR) funded the NEG ASTER project in 2016, where Geological Survey of Denmark and Greenland (GEUS) was tasked to large-scale processing and interpretation of ASTER data in preparation for an upcoming field operation in summer 2018 and with the aim of generating a more detailed geological map sheet (in 1:100.000 scale) from the region. The project is a joint venture with Asiaq, which was contracted to deliver a new detailed Digital Elevation Model (DEM) for the project area. A series of standard ASTER mineral indices (Kalinowski and Oliver 2004) targeting specific spectral absorption features (see Appendix 1) were calculated to improve the geological background knowledge in the area. The resultant images allow to identify the spectral variability and composition within the area covered by scenes. Band ratio color combination images, Principal Component Analysis (PCA) and Minimum Noise Fraction (MNF) methods were used to assign spectral characteristics to variations in lithology in the area.

Altogether 124 scenes were downloaded covering the Hudson Land, Dove Bugt and Dronning Louise Land in North East Greenland (73.3° to 78° N; ~170.000 km2 ), see Appendix 3 for the list of downloaded and processed scenes. A spatial subset including twenty-two ASTER scenes from the region around Hudson Land (73.8° to 75.8° N; ~80.000 km2 ) was selected for further analysis (Figure 1). The first stage of the project started with a test study around Wollaston Forland and processing of only three ASTER scenes. The results were made available by mid-June 2018 for the field participants in
summer. The remaining 19 scenes and the related products were delivered on February 2019.
OriginalsprogEngelsk
UdgivelsesstedCopenhagen
ForlagGEUS
Antal sider64
Vol/bind2019
DOI
StatusUdgivet - 2 maj 2019

Publikationsserier

NavnDanmarks og Grønlands Geologiske Undersøgelse Rapport
ForlagGEUS
Nr.7
Vol/bind2019

Emneord

  • Greenland

Programområde

  • Programområde 4: Mineralske råstoffer

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