RESOLVE­

RESOLVE (for Resolved Spectroscopy of a Local Volume) was a survey of two slices of the celestial sphere within a defined distance-range (65-100 Mpc), aiming to assemble comprehensive data on galaxies, gas, and dark matter within the volumes. It drew from existing survey data, additionally incorporating new radio-astronomy observational data (for the 21-cm line) from Arecibo Observatory and the GBT, and new UVOIR observational data from SOAR, SALT, Gemini Observatory, and Anglo-Australian Telescope.

ECO (for Environmental Context, referring to the environment around the RESOLVE volumes) was basically the same effort, but including the data gathered without regard to RESOLVE's defined distance limits.