The Wisconsin H-alpha Mapper has surveyed the distribution and kinematics of ionized gas in the Northern sky in 1997-1998 and then in the Southern sky in 2009, at an angular resolution of 1°. The combination of the two survey represents the first all-sky survey of the diffuse H-alpha emission from the Milky-Way and consists of more than 49000 spectra (-100 Km/s < vLSR<+100 Km/s).

The map is in Rayleighs.

The WCS map of the integrated survey can been downloaded here : http://www.astro.wisc.edu/wham-site/wham-sky-survey/wham-ss

- Early Results from the Wisconsin H-Alpha Mapper Southern Sky Survey: http://adsabs.harvard.edu/abs/2010AAS...21541528H
- The Wisconsin Hα Mapper Northern Sky Survey: http://adsabs.harvard.edu/abs/2003ApJS..149..405H