Whole Earth images, Does any satellite provide regularly updated ones? |
Whole Earth images, Does any satellite provide regularly updated ones? |
Mar 8 2007, 04:17 PM
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#1
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
There are tons of Earth observing satellites producing gorgeous detailed images, but I'm trying to figure out if any of them is capable of producing full-globe images of Earth on some regularly updated basis. Does anyone here know of such a beast? Are there weather monitoring satellites that do this?
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Mar 8 2007, 04:44 PM
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#2
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Junior Member Group: Members Posts: 22 Joined: 3-January 07 Member No.: 1551 |
I think you could get full-globe images by combining pictures from multiple weather satellites, but obviously you get no more than a hemisphere from anything in GEO. Earth is (if I've done my sums right) 20 degrees across from GEO, so you need some sort of scanning platform to take your detector across Earth.
Ah, this is already done: http://www.ghcc.msfc.nasa.gov/GOES/globalwv.html has global images composed from GOES-EAST (over Peru), GOES-WEST (over the Pacific), and the two Meteosats over the Bight of Benin and Sri Lanka. I suspect there's a Japanese satellite filling the gap east of India. These don't show the poles very well for geometric reasons, and are monochrome (OK, they're trichrome, but those are 10.8u infra-red, 2u infra-red and visible). The polar Earth-observing satellites (say http://rapidfire.sci.gsfc.nasa.gov/) get any point on Earth every few days, but clouds move fast enough that the pictures will look pretty ugly and not line up. |
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