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UV dose 
levels ona 1 x1° grid for land areas of the world ranging from 70 degrees N to 60 degrees S 
latitude. The radiative transfer model used in creating global maps incorporates ozone data from the 
Total Ozone Mapping Spectrometer (TOMS) instrument made available from the National Aeronautics 
and Space Administration (NASA) Goddard Space Flight Center (GSFC), cloud data from the 
Carbon Dioxide Information Analysis Center (CDIAC) at Oak Ridge National Laboratory, and 
RAND's 1° Xx 1° degree elevation dataset obtained via ftp from the National Center for Atmospheric 
Research (NCAR). These data are incorporated along with aerosol and molecular scattering 
parameters to estimate seasonally averaged and peak dose levels. The flexibility of the model allows 
for these and other time averaged and instantaneous UV-B and UV-B + UV-A dose amounts to be 
estimated for any day included in the duration of the TOMS ozone dataset (~1979-1993), or for any 
location having total column ozone measurements. Zonally averaged trends in total column ozone and 
vertical profile ozone loss are also incorporated to estimate future levels of biologically effective dose 
amounts. Future activities in this area include incorporation of 1 km resolution elevation data from 
EROS Data Center (EDC) and finer resolution cloud data from the International Satellite Cloud 
Climatology Program (ISCCP) and/or the Real-Time Nephanalysis model (RTNEPH) provided by 
the United States Air Force. Global datasets of biologically effective radiation can be used in a 
variety of interdisciplinary applications that address the potential impact of UV exposure, including 
skin cancer, cataract incidence, crop damage, and other marine and terrestrial ecosystem impacts. 
References 
Tobler, W., U. Deichmann, J. Gottsegen, and K. Maloy. The Global Demography Project. Technical 
Report TR-95-6, National Center for Geographic Information and Analysis, University of 
California-Santa Barbara, April 1995. 75 pp.