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Over the past 2 decades, wide-field photometric surveys in optical andinfrared domains reached a nearly all-sky coverage thanks to numerousobservational facilities operating in both hemispheres. However, subtledifferences among exact realizations of Johnson and SDSS photometric systemsrequire one to convert photometric measurements into the same system prior toanalysis of composite datasets originating from multiple surveys. It turns outthat the published photometric transformations lead to substantial biases whenapplied to integrated photometry of galaxies from the corresponding catalogs.Here we present photometric transformations based on piece-wise linearapproximations of integrated photometry of galaxies in the optical surveysSDSS, DECaLS, BASS, MzLS, DES, DELVE, KiDS, VST ATLAS, and the near-infraredsurveys UKIDSS, UHS, VHS, and VIKING. We validate our transformations byconstructing k-corrected color-magnitude diagrams of non-active galaxies andmeasuring the position and tightness of the "red sequence". We also providetransformations for aperture magnitudes and show how they are affected by theimage quality difference among the surveys. We present the implementation ofthe derived transformations in Python and IDL and also a web-based colortransformation calculator for galaxies. By comparing DECaLS and DES, weidentified systematic issues in DECaLS photometry for extended galaxies, whichwe attribute to the photometric software package used by DECaLS. As anapplication of our method, we compiled two multi-wavelength photometriccatalogs for over 200,000 low- and intermediate-redshift galaxies originatingfrom CfA FAST and Hectospec spectral archives.

Color Transformations of Photometric Measurements of Galaxies in Optical and Near-Infrared Wide-Field Imaging Surveys