OMP reconstructions of the object a), radio emission from the Crab Nebula, using the BDCT as the sparsifying basis. The original object is 120 × 120 pixels and measurements are simulated from 100 antennas. Reconstructions are run with measurements from a URA in b) (RE = 0.0633), an NRA of 0.14 in c) (RE = 0.0378), and the VLA-based “Y” array in d) (RE = 0.0752). All pixel brightness values in the object and reconstructions are normalized by the object’s maximum pixel brightness value, to lie on [0, 1]. Image a) can be found at http://images.nrao.edu/393 (courtesy of NRAO/AUI and M. Bietenholz).