used to be only available to the military
of the superpowers countries
. However, now many commercial satellite imaging
companies offer to acquire images
of any square meter of the earth
, for a fee. Or the provide access to their catalogue
s and archive
of already acquired images
, which can be bought for less fee.
Used to be only objects much bigger than 20m can be discerned from this commercial satellites, now even objects as small a 1m can be imaged.
Some sources of satellite images:
- Space Imaging (www.spaceimaging.com) - LandSat and Ikonos images.
- Spot Inc (www.spot.com) - Spot images