_:genid1 . _:genid1 "" . _:genid2 . _:genid2 . _:genid2 "49.45"^^ . _:genid2 "18.05"^^ . _:genid2 "-66.95"^^ . _:genid2 "-160.95"^^ . _:genid3 . _:genid3 . "usgs-normal-incident-solar-radiation-atlas" . "Normal Incident Solar Radiation Atlas"^^ . _:genid1 . . "These data were originally downloaded from the National Renewable Energy Laboratory (NREL) web site http://www.nrel.gov/gis/data_solar.html in units of kilowatt-hours per square meter per day and were converted to Langleys per day. 1 Langley per day = 1 calorie per square centimeter per day. or 1 Langley per day = 0.01163 kilowatt-hour per square meter per day. NREL has several different values of solar radiation available, the \"global horizontal\" data is what is represented by this service. \"Global horizontal\" means on a surface perpendicular to the radius -- i.e. a horizontal plate, wherever on the Earth you are measuring (or using) it. Please note NREL's disclaimer: http://www.nrel.gov/disclaimer.html"^^ . _:genid2 . _:genid3 . . _:genid4 . _:genid4 . _:genid4 . _:genid4 . "c63afadb-3dc1-40fb-b9e5-84b334f2e897" . . "normal-incident-solar-radiation-atlas" . .