2MASS, Sloan Digital Sky Survey (SDSS), WISE
2MASS- http://www.ipac.caltech.edu/2mass/
2MASS is an infrared survey of the sky.
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2MASS used two highly-automated 1.3-m telescopes, one at Mt. Hopkins, AZ, and one at CTIO, Chile. Each telescope was equipped with a three-channel camera, each channel consisting of a 256×256 array of HgCdTe detectors, capable of observing the sky simultaneously at J (1.25 microns), H (1.65 microns), and Ks (2.17 microns).
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--SDSS
It looks like SDSS is an optical survey. It has created color maps of the sky.
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The SDSS used a dedicated 2.5-meter telescope at Apache Point Observatory, New Mexico, equipped with two powerful special-purpose instruments.
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SDSS-III will continue operating and releasing data through 2014.
Data Release 8 contains all images from the SDSS telescope - the largest color image of the sky ever made. It also includes measurements for nearly 500 million stars and galaxies, and spectra of nearly two million. All the images, measurements, and spectra are available free online. You can browse through sky images, look up data for individual objects, or search for objects anywhere in the sky based on any criteria.
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-WISE
WISE is a near-infrared survey.
"Infrared data with WISE allows you to search for asteroids, comets, cool planets, cool stars, origin of stellar and planetary systems, and most luminous galaxies in the universe." not perfect quote
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