Comparison of resolution, sensitivity, and sky coverage of different radio surveys. The logarithmic x- and y-axes are frequency and resolution, respectively. The colour scale shows the relative survey sensitivity, having scaled the sensitivity ofeach survey to ν = 144 MHz assuming a typical synchrotron spectral index of α = −0.7. The circle outlines show 100% sky coverage, while the size of the coloured circles correspond to the percentage of the sky that will be covered by the survey; see the key on the right to guide the eye. Horizontal grey lines show typical resolutions of space (Hubble Space Telescope; HST) and ground-based (PanSTARRS) optical telescopes.