The data are weekly files for 2005-2014 of total daily UVB radiation (KJ/m2/day), averaged for each week. The process for creating this data product is described in the PowerPoint presentation  "Using Remote Sensing Data to Improve UVB Estimates". 

The primary value of the data are that they are more accurate in estimating UVB values for locations distant from UVMRP monitoring stations that the values that are estimated used traditional spatial interpolation, as reported on the UVMRP web site. 

They are provided in three formats: Terrset/IDRISI (*.rst and *.rdc), geotiff (*.tif), and ARCASCII (*.asc, the ESRI format for importing gridded data). The *.rst files can also be treated as binary BIP files with a single band. The following information describes the spatial parameters of the grids. They are in geographic (lat-lon) projection, with 1 degree resolution. They cover the co-terminus USA. 

Filename: uvb_day_year_wk_jd1-jd2.*
where "year" is the year, "wk" is the week of the year, and "jd1" and "jd2" are beginning and ending julian dates for the week. 

columns     :   61
rows        :   27
ref. system : latlong 
ref. units  : degrees
min. X      :    -125.
max. X      :     -64.
min. Y      :      24.0
max. Y      :      51.0
resolution  :     1.0