Ranger, Surveyor, Luna, Luna Orbiter, 1960s Missions to Earth's Moon |
Ranger, Surveyor, Luna, Luna Orbiter, 1960s Missions to Earth's Moon |
Apr 21 2005, 08:07 PM
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Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
Have any of the serious experts on this board ever sorted out any 1960s images? I'm thinking of the Surveyor panoramas (in the 60s they did it with photos pasted onto the inside of half-spheres!) and the way that the exposure dropped off toward one corner, making a horrible patchwork effect. Or them lines and spots on the Lunar Orbiter images...
Most of the NASA mission data should be available as digital source material, and thus could be manipulated, though I suspect that getting anything 'real' from Soviet missions would be a bit of a chase! Any thoughts? -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Apr 24 2005, 09:45 AM
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#2
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
Interesting!....
The Surveyor cameras were analog TV, and transmitted a slow scan analog signal. The 200 line mode was intended for omni antenna transmission and took quite a while.. maybe 5 min for a pic. <Memory here.> The 600 line mode pics were transmitted by the high gain antenna and could come back a bit slower than maybe 1 per minute. Data was recorded directly onto analog magnetic tape, and (probably) simultaneously onto film in a slow-scan film recorder. Later in the program, selected images, for test and somtimes for scientific purposes, were digitized, radiometrically decalibrated, and put on film. The image quality removed ghosting effects in the raw film records and quite considerably improved the data. Some samples were shown of this for Surveyor 1, at least. This processing was done for colorimetric and polarimetric work to get "absolute" and polarimetry data on selected targets, but relatively little was published of this, and no decalibrated color pictures, as far as I recall. I'm inclined to doubt that the analog tapes of the Surveyor data survive, but ghods (and the Great Ghoul of the Galaxy) only know! |
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