Geology topics
Donald B. Segal
Publications and source records attributed to Donald B. Segal.
Thematic classification of multispectral image data by use of digital film recorders
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A technique using diazo film for isolating areas of spectral similarity
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Preliminary digital classification map of limonitic rocks, Candland Spring Quadrangle, Utah
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Preliminary digital classification of limonitic rocks, Cat Canyon Quadrangle, Utah
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Preliminary digital classification map of limonitic rocks, The Barn 15' quadrangle, Utah
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Preliminary digital classification map of limonitic rocks, Wah Wah Summit 15' quadrangle, Utah
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Digital mapping of limonitic rocks by using Landsat MSS radio data
Color-ratio composite images of Landsat MSS (multi-spectral scanner) bands have been used by other workers to map the distribution of limonitic rocks in semi-arid and arid areas as possible indicators of hydrothermal alteration (Rowan et al, 1974). The images are particularly useful for broad overviews, but detailed analysis at large scales requires both numerical analysis of the ratio values to distinguish consistently among categories of limonitic rocks and a precise transfer of the data to large-scale base maps. Both requirements can be met by digital classification followed by a precise geometric registration of the classified data.