The Effelsberg-Bonn HI Survey (EBHIS)
This 21 cm survey has been performed with the 100-m telescope at Effelsberg. The surveys covers the northern sky (Dec >-5°) of the Milky-Way and the local volume out to a redshift of ~0.07. The angular resolution is 10.8'. Units of the Healpix map are cm^2.
Reference
'The Effelsberg-Bonn H I Survey: Milky Way gas. First data release' by Winkel B. et al, A&A, 2016, 26, 585 http://adsabs.harvard.edu/abs/2016A%26A...585A..41W