着々と進めて欲しいですな゜゜゜゜゜-y(^。^)。o0○ﾌﾟﾊｰ
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●偵察衛星による画像解析の解像度　　wikipedia（訳：俺）

数百ｋｍの距離で撮影される衛星写真の解像度は通常は飛行機によるそれより劣る。しかし衛星は
地球の広い範囲をカバーできる。敵地でもパイロットを撃墜される恐れがない。

Though the resolution of satellite photographs, which must be taken from distances of hundreds
of kilometers, is usually poorer than photographs taken by air, satellites offer the possibility
of coverage for much of the earth, including hostile territory, without exposing human pilots
to the risk of being shot down.

宇宙開発の最初の年から、１２カ国のくにから何百という偵察衛星が打ち上げられた。偵察衛星は
通常低軌道をとぶ。写真を投下していた初期のころは１００〜２００ｋｍだ。最近のＣＣＤカメラを積んだものは
２５０〜３００ｋｍになる。数年の間留まらせるためだ。最近のスパイ衛星の解像度は機密になっている。
光学的に最大の解像度は以下のレイリーの式で導き出せる：

　 size θ = 1.22 * λ * distance / Ｄ．

ここでθは解像角度、λは光の波長、Ｄはレンズの直径である。（中略）。
米国の最近の衛星IMINTは１０ｃｍ前後と信じられている。これは車の車種を判別するのに十分である。
とはいえ大衆文化に出てくるような新聞の見出しを読むことはできない。

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

There have been hundreds of reconnaissance satellites launched by dozens of nations since the first
years of space exploration. Satellites for imaging intelligence were usually placed in low-earth,
high-inclination orbits, sometimes in sun-synchronous orbits. Since the film-return missions
were usually short, they could indulge in orbits with low perigees, in the range of 100?200 km,
but the more recent CCD-based satellites have been launched into higher orbits, 250?300 km perigee,
allowing each to remain in orbit for several years. While the exact resolution and other details of
modern spy satellites are classified, some idea of the trade-offs available can be made using simple
physics. The formula for the highest possible resolution of an optical system with a circular aperture
is given by the Rayleigh criterion:
sinθ = 1.22 * λ /　Ｄ
and
sinθ = size/distance
we can get
sizeθ = 1.22 * λ * distance / Ｄ．
where θ is the angular resolution, λ is the wavelength of light, and D is the diameter of the lens
or mirror. Were the Hubble Space Telescope, with a 2.4 m telescope, designed for photographing Earth,
it would be diffraction-limited to resolutions greater than 16 cm (6 inches) for green light
( \lambda \approx 550 nm) at its orbital altitude of 590 km. This means that it would be impossible
to take photographs showing objects smaller than 16 cm with such a telescope at such an altitude.
Modern U.S. IMINT satellites are believed to have around 10 cm resolution; contrary to references
in popular culture, this is sufficient to detect any type of vehicle, but not to read the headlines
of a newspaper.