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A reevaluation of spectral ratios for lunar mare TiO2 mappingThe empirical relation established by Charette et al. (1974) between the 400/560-nm spectral ratio of mature mare soils and weight percent TiO2 has been used extensively to map titanium content in the lunar maria. Relative reflectance spectra of mare regions show that a reference wavelength further into the near-IR, e.g., above 700 nm, could be used in place of the 560-nm band to provide greater contrast (a greater range of ratio values) and hence a more sensitive indicator of titanium content. An analysis of 400/730-nm ratio values derived from both laboratory and telescopic relative reflectance spectra suggests that this ratio provides greater sensitivity to TiO2 content than the 400/560-nm ratio. The increased range of ratio values is manifested in higher contrast 400/730-nm ratio images compared to 400/560-nm ratio images. This potential improvement in sensivity encourages a reevaluation of the original Charette et al. (1974) relation using the 400/730-nm ratio.
Document ID
19920030349
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Johnson, Jeffrey R.
(Arizona Univ. Tucson, AZ, United States)
Larson, Stephen M.
(Arizona Univ. Tucson, AZ, United States)
Singer, Robert B.
(Arizona, University Tucson, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Geophysical Research Letters
Volume: 18
ISSN: 0094-8276
Subject Category
Lunar And Planetary Exploration
Accession Number
92A12973
Funding Number(s)
CONTRACT_GRANT: NAGW-1332
CONTRACT_GRANT: NAGW-247
Distribution Limits
Public
Copyright
Other

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