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University of London - Imperial College London (1988)

Quaternary aeolian sand mapping in Saudi Arabia using remotely sensed imagery

Al-Hinai, Khattab Ghalib

Titre : Quaternary aeolian sand mapping in Saudi Arabia using remotely sensed imagery.

Auteur : Al-Hinai, Khattab Ghalib.

Université de soutenance : University of London - Imperial College London

Grade : Doctor of Philosophy (Ph.D.) : 1988

Résumé partiel
In Saudi Arabia, basic information on sand distribution in desert terrains is limited. The difficulties of direct ground mapping and measurement and the cost of conducting full scale monitoring experiments in remote areas is a major handicap in producing reliable and applicable data. This study is an assessement of air and space photography together with various forms of available scanner imagery as aids to sand dune mapping and movement patterns. Sand dune types have been identified and mapped at several test site areas. Dune morphology has been investigated together with dune distribution in the Jafurah Sand Sea in the Eastern Province of Saudi Arabia. Comparison of the usefulness in terms of spatial and spectral resolution for sand dune mapping were made between Landsat multi spectral scanner (MSS) and Thematic Mapper (TM) images, Large Format Camera (LFC) photographs, and aerial photographs, together with the Shuttle Imaging Radar (SIR-A) imagery. LFC photographs were also evaluated for dune height measurements in the south eastern Rub’al Khali (Empty Quarter) Sand Sea. Digital image enhancements including the production of several types of contrast stretched false colour composites, hue saturation intensity images, principal component analysis, and spatial filtering were used as aids to sand type discrimination, delineation and mapping. MSS band 1 6 (0.5-0.6 m) and the equivalent TM band 2 images were evaluated for detection and interpretation of possible submerged sand dunes in the shallow waters along the area north of the Gulf of Salwa in the Arabian Gulf. Estimates of dune movement in the Jafurah Sand Sea were made using the multi-temporal aerial photographs (dated 1949 and 1983) and Landsat MSS images (1972 to 1984) together with field measuremenet (1984 to 1985).

Annonce : EThOS (UK)

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