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Accurate determinations of stellar parameters and distances for largecomplete samples of stars are keys for conducting detailed studies of theformation and evolution of our Galaxy. Here we present stellar atmosphericparameters ($T_{\rm eff}$, luminosity classifications, and [Fe/H]) estimatesfor some 24 million stars determined from the stellar colors of SMSS DR2 andGaia EDR3, based on training datasets with available spectroscopic measurementsfrom previous high/medium/low-resolution spectroscopic surveys. The number ofstars with photometric-metallicity estimates is 4-5 times larger than thatcollected by the current largest spectroscopic survey to date - LAMOST - overthe course of the past decade. External checks indicate that the precision ofthe photometric-metallicity estimates are quite high, comparable to or slightlybetter than that derived from spectroscopy, with typical values around0.05-0.15dex for both dwarf and giant stars with [Fe/H]>$-$1.0, 0.10-0.20dexfor giant stars with $-$2.0<[Fe/H]<$-$1.0. and 0.20-0.25dex for giant starswith [Fe/H]<$-$2.0, and include estimates for stars as metal-poor as[Fe/H]~$-$3.5, substantially lower than previous photometric techniques.Photometric-metallicity estimates are obtained for an unprecedented number ofmetal-poor stars, including a total of over three million metal-poor (MP;[Fe/H] <$-$1.0) stars, over half a million very metal-poor (VMP; [Fe/H]<$-$2.0)stars, and over 25,000 extremely metal-poor (EMP; [Fe/H]<$-$3.0) stars.Moreover, distances are determined for over 20 million stars in our sample. Forthe over 18 million sample stars with accurate Gaia parallaxes, stellar agesare estimated by comparing with theoretical isochrones. Astrometric informationis provided for the stars in our catalog, along with radial velocities for ~10%of our sample stars, taken from completed/ongoing large-scale spectroscopicsurveys.

Beyond spectroscopy. I. Metallicities, distances, and age estimates for over twenty million stars from SMSS DR2 and Gaia EDR3