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The Robotic Lunar Observatory (ROLO) dataset from the US Geological Survey (USGS) consists of over six years (1999-2003) of telescopic spectral reflectance observations in 32 bands ranging from 350 to 2500 nm with a resolution of ~7 kilometers/pixel. This study compares ultraviolet/visible (UV/VIS) ratios derived from ROLO images of the lunar nearside to data from the Clementine UV-VIS camera and the Lunar Prospector Gamma-Ray Spectrometer Ti and Fe abundance maps. The ROLO 347/415 ratio has similar color unit boundaries as the Clementine 415/750 ratio, although there are distinct and significant differences. For example, crater rays (maturity) have lesser contrast in the shorter wavelength ratio which is especially notable at Aristarchus and Tycho craters. Contrasts within broad scale mare units (~100 km) are also apparent. Quantitative analysis of color differences in the context of existing orbital and sample based geochemistry may provide an accurate marker of titanium and iron abundances. The ROLO data are radiometrically calibrated to high degree (5-10% absolute) and will serve as the foundation for interpreting the upcoming Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC) UV-Visible 500 meter/pixel global dataset. [Acknowledgement to Tom Stone at the USGS for providing the ROLO data].
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