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Related: Editorials & Other Articles, Issue Forums, Alliance Forums, Region ForumsThere Are Giant Camera Resolution Test Charts Scattered Across the US
When people test cameras and lenses for resolution, they commonly use special resolution test charts that are filled with black bars of varying lengths and thicknesses. Theyre kind of like eye charts, except for cameras instead of eyeballs, and with lines instead of letters.
Well, did you know that in dozens of locations around the United States, there are gigantic resolution test charts on the ground?
The Center for Land Use Interpretation writes that the strange land-based two-dimensional optical artifacts are used for the development of aerial photography cameras built into airplanes and drones.
The resolution charts were mostly used during the 50s and 60s, but some of them may still be used nowadays to calibrate flying cameras. They have dimensions of around 50-80 feet and are coated in heavy black and white paint. Heres what one target looks like from the ground:
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http://www.petapixel.com/2013/02/15/there-are-giant-camera-resolution-test-charts-scattered-across-the-us/
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There Are Giant Camera Resolution Test Charts Scattered Across the US (Original Post)
n2doc
Feb 2013
OP
Angry Dragon
(36,693 posts)1. Alien landing instructions
Princess Turandot
(4,787 posts)2. Here's the second one in your post..
in Google Maps: http://goo.gl/maps/tE6hJ It's about 50' by 75' in size.
Robb
(39,665 posts)3. USDA aerial maps from the 50s are fascinating historical documents
...created, every one, from aerial photographs -- equally fascinating, those.
surrealAmerican
(11,361 posts)4. k & r
Champion Jack
(5,378 posts)5. K&R