MURAL - Maynooth University Research Archive Library



    Geological and Geomorphological Applications of Low-Angle Illumination Satellite Imagery in Northern Ireland


    Gibson, Paul (1993) Geological and Geomorphological Applications of Low-Angle Illumination Satellite Imagery in Northern Ireland. Irish Geography, 26 (1). pp. 58-64. ISSN 0075-0778

    [img]
    Preview
    Download (3MB) | Preview


    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...



    Add this article to your Mendeley library


    Abstract

    Some geoscientists consider satellite imagery as having limited research potential due to their inability to elicit useful information. However, their lack of information extraction is often partly caused by a poor understanding of the importance of such parameters as illumination angle orwaveband selection. For the analysisof geological or geomorphological features in vegetated terrain, high-angle illumination imagery acquired between March and October reveals little information. However, low-angle illumination imagery (<10o solar elevation) obtained in December clearly displays many geomorphological and geological structures not apparent at a higher sun angle. The North Antrim End Moraine can easily be mapped as a single feature on a December image. The Tempo-Sixmilecross Fault and Omagh Fault can also be readily mapped at low-angle illumination and the spatial relationships of these faults to associated structures readily determined. In vegetated terrain Thematic Mapper band 5 is superior to Thematic Mapper band 4 for information extraction. This is partly due to the lower reflectance variance for vegetation on Thematic Mapper band 5 compared with Thematic Mapper band 4, thus the continuity of features is not disrupted.

    Item Type: Article
    Keywords: Low-angle illumination; Thematic Mapper band 5; North Antrim End Moraine; Tempo-Sixmilecross Fault; Omagh Fault;
    Academic Unit: Faculty of Social Sciences > Geography
    Item ID: 8814
    Depositing User: Paul Gibson
    Date Deposited: 12 Sep 2017 16:48
    Journal or Publication Title: Irish Geography
    Publisher: Geographical Society of Ireland
    Refereed: Yes
    URI:

    Repository Staff Only(login required)

    View Item Item control page

    Downloads

    Downloads per month over past year