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Imaging surveys of galaxies will have a high number density and angularresolution yet a poor redshift precision. Intensity maps of neutral hydrogen(HI) will have accurate redshift resolution yet will not resolve individualsources. Using this complementarity, we show how the clustering redshiftsapproach, proposed for spectroscopic surveys can also be used in combinationwith intensity mapping observations to calibrate the redshift distribution ofgalaxies in an imaging survey and, as a result, reduce uncertainties inphotometric redshift measurements. We show how the intensity mapping surveys tobe carried out with the MeerKAT, HIRAX and SKA instruments can improvephotometric redshift uncertainties to well below the requirements of DES andLSST. The effectiveness of this method as a function of instrumentalparameters, foreground subtraction and other potential systematic errors isdiscussed in detail.

Calibrating photometric redshifts with intensity mapping observations