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Table 5 Strengths and weaknesses of AVGLO and NASA TOMS measures of ultraviolet radiation (UVR)

From: Cumulative solar ultraviolet radiation exposure and basal cell carcinoma of the skin in a nationwide US cohort using satellite and ground-based measures

MeasureStrengthsWeaknesses
AVGLOFine geographical resolution (1 km2 grid).Limited to continental USA
Full day average of solar exposure.Scaling required to get from total solar exposure to UVR.
Ongoing data collection from 1960 to present. 
Non-erythemally weighted UVR 
Ground based (skyward facing) 
Measured irradiances 
Ground-based data collection, taking account of cloud cover throughout the day. 
NASA TOMSWorldwide coverage.Limited geographical resolution (1 degree longitude × 1 degree latitude).
Space based (earth facing)Measurements are based on inferred peak (midday) irradiance.
Erythemally weighted UVR.
Scaling required to get from UVB to UVR
Modeled irradiances based on satellite O3 atmospheric absorption measures, taking account of elevation, solar zenith angle and time of sunrise/sunset
Limited account taken of cloud cover (only as affects midday measurement).
UVB measurements from 1978 to 1994 and 1996–2006. The TOMS Earth-Probe satellite failed in 2006, replaced by the Ozone Monitoring Instrument since then.