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Satellite imagery...

By: DueDillinger in CONSTITUTION | Recommend this post (0)
Mon, 03 Oct 11 1:29 AM | 97 view(s)
Boardmark this board | Constitutional Corner 		Msg. 15470 of 21975
(This msg. is a reply to 15466 by monkeytrots)
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You'd best update your satellite view, mon. Commercial grade SPOT imagery is 2.5m/pixel these daze.

Most land areas are covered in satellite imagery with a resolution of about 15 m per pixel. This base imagery is 30m multispectral Landsat which is pansharpened with the 15m [panchromatic] Landsat imagery. However, Google is actively replacing this base imagery with 2.5m SPOTImage imagery and several higher resolution datasets mentioned below. Some population centers are also covered by aircraft imagery (orthophotography) with several pixels per meter. Oceans are covered at a much lower resolution, as are a number of islands; notably, the Isles of Scilly off southwest United Kingdom were at a resolution of about 500 m or less, although this has since been addressed.

http://en.wikipedia.org/wiki/Google_Earth

SPOT resolutions:
http://www.spotimage.com/web/en/233-resolution-and-spectral-bands.php

Below is a QuickBird image at 2.44m resolution.

Uploaded Image

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The above is a reply to the following message:
Re: Beauty of the Day: Due
By: monkeytrots in CONSTITUTION
Mon, 03 Oct 11 12:17 AM 		Msg. 15466 of 21975

Note: A common misconception is that the 'imagery' in Google and Google Earth is 'satellite' imagery.

It isn't. It is moderate to high altitude aeril photo reconnaissance. Most of the high quality pics come from surveys conducted (and paid for) by the USDA. ( And yes, the imagery IS very dated that Google uses. )

You can visit that site to find more.

Most satellite imagery is 25meter resolution - maximum.
There is SOME higher resolution than that - but it is pretty rare, and much of it 'costs'. Military satellites ARE capable of higher resolutions - but that stuff does NOT go into the public domain.

Just a 'fwiw' bit of trivia for a bright, sunshiny Sunday Afternoon.

*w*

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