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Table 2 Validation of UVEry from ATPRK vs. NASA grids using UVMRP stations by year (1998–2012)

From: Spatiotemporal exposure modeling of ambient erythemal ultraviolet radiation

     % relative improvement
Year Prediction model MAE RMSE MAE RMSE
1998 NASA 17.4 20.1 -- --
ATPRK 13.7 16.6 21.6 17.5
2000 NASA 26.5 30.9 -- --
ATPRK 13.8 17.9 48.1 42.0
2002 NASA 26.9 31.2 -- --
ATPRK 19.2 28.3 28.5 9.3
2004 NASA 23.5 31.0 -- --
ATPRK 13.9 19.2 40.6 38.1
2006 NASA 15.4 20.4 -- --
ATPRK 13.8 19.3 10.4 5.2
2008 NASA 17.2 20.7 -- --
ATPRK 12.7 16.2 26.2 21.6
2010 NASA 13.9 18.8 -- --
ATPRK 17.2 23.7 −23.8 −26.4
2012 NASA 21.7 31.3 -- --
ATPRK 22.4 28.7 −3.4 8.1
Average 1998–2012 NASA 20.3 25.5 -- --
ATPRK 15.8 21.3 22.0 16.8
  1. Abbreviations: ATPRK area-to-point residual kriging, MAE mean absolute error, NASA National Aeronautics and Space Administration, RMSE root mean square error