Using the 37 USDA point measurements of daily noontime (11:00 AM to 1:00 PM) UV-B time series data from 1999 to 2005, across the continental U.S., the UV-I was generated from an irradiance scale that was computed by multiplying the CIE irradiance in watts m-2 by 40 (Environment Canada, 2008). By spatially interpolating daily and monthly UV-I data, the seasonal and yearly UV-I spatial data were produced. At the same time, synchronous TOMS data were acquired for the purpose of comparison. Finally, a comparison of daily UV doses estimated from Nimbus 7/TOMS measurements and ground-based spectroradiometric data was conducted to examine the agreement of these two sources of data statistically. To present the comparison in detail, several analyses of the daily variation, trends, and spatial distribution characteristics of UV-I are discussed.
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