Fil:Global Lightning Frequency.jpg
Frå Wikipedia – det frie oppslagsverket
Storleiken på denne førehandsvisinga: 800 × 389 pikslar
Biletet i større oppløysing (1205 × 586 pixel, file size: 326 KB, MIME type: image/jpeg)
Measured in flashes/km²/year.
Original uploaded 7. Nov 2003 in Dansk wikipedia by da:Bruger:Glenn
Fra hollandsk Wikipedia (Bliksem). Kilde NASA: http://visibleearth.nasa.gov/cgi-bin/viewrecord?10812 . http://visibleearth.nasa.gov/help.html Citat: "...Unless otherwise noted, all images and animations made available through Visible Earth are generally not copyrighted...". Konverteret til JPEG.
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This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).
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