  We present a new method for interferometric imaging that is ideal for the
large fields of view and compact arrays common in 21 cm cosmology. We first
demonstrate the method with simulations for two very different low frequency
interferometers, the Murchison Widefield Array (MWA) and the MIT Epoch of
Reionization (MITEoR) Experiment. We then apply the method to the MITEoR data
set collected in July 2013 to obtain the first northern sky map from 128 MHz to
175 MHz at about 2 degree resolution, and find an overall spectral index of
-2.73+/-0.11. The success of this imaging method bodes well for upcoming
compact redundant low-frequency arrays such as HERA. Both the MITEoR
interferometric data and the 150 MHz sky map are publicly available at
http://space.mit.edu/home/tegmark/omniscope.html.
