Summary of the sensitivity, frequency, and resolution of a selection of recent and planned large-area radio surveys (see also Table 1). The size of the markers is proportional to the square root of the survey resolution. Grey, blue, and red markers show the ongoing/completed surveys, forthcoming surveys, and the LOFAR HBA surveys, respectively. The horizontal lines show the frequency coverage for surveys with large fractional bandwidths (>0.2). The green sloping lines show the sensitivity that is equivalent to that achieved in the LoTSS direction-dependent (DD) calibrated and direction-independent (DI) images for typical radio sources with a spectral index ~−0.7. Similarly, the blue sloping lines show the equivalent sensitivity to steep spectrum sources with a spectral index ~−1.0.