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The Spitzer Survey of Stellar Structure in Galaxies S^4G is an ExplorationScience Legacy Program approved for the Spitzer post-cryogenic mission. It is avolume-, magnitude-, and size-limited (d < 40 Mpc, |b| > 30 degrees, m_(Bcorr)< 15.5, D25>1') survey of 2,331 galaxies using IRAC at 3.6 and 4.5 microns.Each galaxy is observed for 240 s and mapped to > 1.5 x D25. The finalmosaicked images have a typical 1 sigma rms noise level of 0.0072 and 0.0093MJy / sr at 3.6 and 4.5 microns, respectively. Our azimuthally-averaged surfacebrightness profile typically traces isophotes at mu_3.6 (AB) (1 sigma) ~ 27 magarcsec^-2, equivalent to a stellar mass surface density of ~ 1 Msun pc^-2. S^4Gthus provides an unprecedented data set for the study of the distribution ofmass and stellar structures in the local Universe. This paper introduces thesurvey, the data analysis pipeline and measurements for a first set ofgalaxies, observed in both the cryogenic and warm mission phase of Spitzer. Forevery galaxy we tabulate the galaxy diameter, position angle, axial ratio,inclination at mu_3.6 (AB) = 25.5 and 26.5 mag arcsec^-2 (equivalent to ~ mu_B(AB) =27.2 and 28.2 mag arcsec^-2, respectively). These measurements will formthe initial S^4G catalog of galaxy properties. We also measure the totalmagnitude and the azimuthally-averaged radial profiles of ellipticity, positionangle, surface brightness and color. Finally, we deconstruct each galaxy usingGALFIT into its main constituent stellar components: the bulge/spheroid, disk,bar, and nuclear point source, where necessary. Together these data productswill provide a comprehensive and definitive catalog of stellar structures, massand properties of galaxies in the nearby Universe.

The Spitzer Survey of Stellar Structure in Galaxies (S^4G)