The Sloan Digital Sky Survey (SDSS) is a project dedicated to mapping the universe. Over eight years of operations, it has obtained deep, multi-color images covering over a quarter of the sky and created 3-dimensional maps containing more than 930,000 galaxies and more than 120,000 quasars.
SDSS provides a SOAP-based interface for retrieving image cutouts from its archive. Users must provide an array of information to specify the desired image, including right ascension, declination, scale, image width and height, and drawing options. The service then returns the requested image in JPEG format.