The 2MASS Photometric Redshift catalogue (2MPZ) archive, was constructed by cross-matching 2MASS XSC, WISE and SuperCOSMOS all-sky samples and employing the artificial neural network approach (the ANNz algorithm, Collister & Lahav 2004), trained on several redshift surveys (2MRS, SDSS, 6dFGS, 2dFGRS and ZCAT). The derived photometric redshifts have errors nearly independent of distance, with an all-sky accuracy of σz = 0.015, and a very small percentage of outliers. These redshift estimates have a typical precision of 12% for all the 2MASS XSC galaxies that lack spectroscopy. The resulting 2MPZ sample contains almost 1 million galaxies with a median redshift of z=0.07. This catalogue is described in Bilicki et al. 2014, ApJS, 210, 9.

The arrangement of the data is simple: all the data is in the twompzPhotoz table. The table is linked to the 3 input photometric tables through the twomassID, which links to the TWOMASS twomass_xsc ext_key, the scosID, which links to the SSA Source objID and the wiseID, which links to the WISE wise_allskysc cntr. It is much faster to match through the integer IDs rather than the designations. Matching is possible to previous releases of UKIDSS and VISTA and OSA ATLAS surveys through the existing neighbour tables to twomass_xsc. Future releases of these surveys will be matched directly to the 2MASS Photometric Redshift catalogue (2MPZ).