Spatial distortion and quantitative geological mapping of makhtesh ramon, NEGEV, israel, by using the ger 63 channel scanner data

Eyal Ben-Dor, Freda Kruse, John B. Dietz, Andi W. Braun, Amos Banin

Research output: Contribution to journalArticlepeer-review

Abstract

GER aircraft scanner data acquired over Makhtesh Ramon, Negev, Israel, during July 1989 have significant geometric distortions along the cross-track direction that affect the data's use for surface mapping. The GER scanner data geometry was inspected relative to a digitized 1:20,000-scale geological map and SPOT data using image-to-map and image-to-image registrations, respectively. Geometric corrections were made by picking ground-control-points (GCPs) and warping the GER data using both polynomial (first, second, and third degrees) and Delaunay triangulation techniques. The triangulation technique with 125 GCPs for the image-to-map registration and 135 GCPs for the image-to-image registration was found to produce the best results for the GER raw image. Linear spectral unmixing (UNM) was used to produce maps of specific mineral components of part of the Makhtesh Ramon. The GER UNM spatial-corrected images for three endmembers (calcite, dolomite, and gypsum) are generally in good agreement with the geological map units. Some small inconsistencies occur between the UNM images and the geological map. Field observations indicated that errors in both geological mapping and UNM classification occurred. Other inconsistencies between the UNM and geological maps were due to seasonal changes of surface mineral coverage by alluvial and aeolian materials. The total inconsistencies were between 10 and 20% of the entire area examined and are easily explained. The results showed that despite its great distortion, the GER 63-channel scanner was a good vehicle for accurate and quantitative mineral mapping.

Original languageEnglish
Pages (from-to)258-268
Number of pages11
JournalCanadian Journal of Remote Sensing
Volume22
Issue number3
DOIs
StatePublished - Sep 1996

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