|Upload||Freitag, 14. Juli 2017; wabis|
|Source||Youtube: TestingTheGlobe's Second High-Altitude Balloon Launch, Rob Skiba, Time 1:47:51|
|Masse||1466 x 751 Pixel|
|Tip||Click image to zoom|
Image from a high altitude balloon taken with a GoPro, fitted with a 7,2 mm = 41 mm 35 mm equivalent lense, no fish eye distortion. I put the altitude of 94 000 ft = 28,7 km, f = 41 mm, FoV = 55,6° and aspect ratio 16:9 into my Earth Curvature Simulator and overlayed the calculated grid over the footage.
To eliminate the possibility of a small distortion I choose an image where the horizon crosses the center of the screen. Lines crossing the center of a lense don't get distorted.
It matches perfectly, the image shows the predicted curvature of the earth.
Some data for this image from my simulator:
|Altitude||94 000 ft = 28,7 km|
|Focal Length GoPro||7,2 mm|
|35 mm equivalent Focal Length||41 mm|
|Field of View||55,6°|
|Distance to Horizon along Surface||603,6 km|
|Distance to Horizon Line of Sight||605,4 km|
|Drop from Surface||28,57 km|
|Drop from Eye Level||57,27 km|
|Grid Line Spacing||13,4 km|