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These are generally everywhere in the new high resolution images.
They exhibit regular patterns of placement, though not on exact repeatable locations.
Some have tiny (possibly intentional) variations.
A possible explanation is "dirt in the lens." However, some have a complex cloud-like shape, or appear as very precise circular arcs.
Some could be inserted purposely for copyright protection or image alignment.
We show collections for
France ---- Charenton-le-Pont ---- La Ferté-Alais
Germany: they are everywhere. We selected ---- Augsburg ---- Berlin ---- Braunschweig, 26 March 2005 ---- Cologne, various postings by "lowball" on Google Earth Hacks ---- Feldkirchen ---- Hannover ---- Mannheim (beautiful shiny ovals), 28 November 2006 ---- Rheine, 8 April 2006 ---- Würzburg NEW
Netherlands: none found in the new high resolution imagery
UK: everywhere; we selected ---- Huntingdon ---- London (reduced since September 2006 updates) ---- Manchester ---- March (unusual identical areas of brightness and discoloration) ---- Southampton, 30 April 2006 and 28 January 2006
USA ---- Bethel, Ohio, 25 July 2006 ---- Huntsville, Alabama, 17 May 2005 ---- Maine crosshairs: Probably the most regular crosshairs to be seen, every sixteenth of a degree. Discovered by TerryInGP