QuickBird   WorldView-1
The QuickBird satellite is the first in a constellation of sub-meter spacecraft that DigitalGlobe has developed that offers highly accurate, commercial high-resolution imagery of Earth.
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WorldView-1, launched September 2007, is the first of our next-generation satellites—the most agile satellites ever flown commercially. The high-capacity, panchromatic imaging system features half-meter resolution imagery.
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WorldView-2   GeoEye-1
WorldView-2, launched October 2009, is the first high-resolution 8-band multispectral commercial satellite. Operating at an altitude of 770 kilometers, WorldView-2 provides 46 cm* panchromatic resolution and 1.85 meter* multispectral resolution.
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The GeoEye-1 satellite is equipped with some of the most advanced technology ever used in a commercial remote sensing system. The satellite collects images at .41-meter panchromatic (black-and-white) and 1.65-meter multispectral resolution.
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IKONOS      
The IKONOS satellite is the world’s first commercial satellite to collect panchromatic (black-and-white) images with .80 m resolution and multispectral (color) imagery with 3.2-meter resolution.
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