I did infographic about high-resolution optical Earth observation satellites.
It's available as lower resolution image (14 268×3480 pixels) or https://docs.google.com/open?id=0B7ahcDowD8i_SnBTQzFIRDROd1k (20 600×5078 pixels) or https://docs.google.com/open?id=0B7ahcDowD8i_QVVSbWFOa0tDakk.
14 268×3480 version:
http://4.bp.blogspot.com/-0-NKZ5iLbKM/UHqXtdIWC2I/AAAAAAAAAU4/mCHaEAut3L0/s0/Hi-ResOptEarthObsSats3480h.png.
More info is on my http://my-favourite-universe.blogspot.cz/2012/10/infografika-spionazni-druzice.html (it's mostly in Czech, but it's readable with google translator, which is on the page).
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