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The California-Kepler Survey (CKS) is an observational program to improve ourknowledge of the properties of stars found to host transiting planets by NASA'sKepler Mission. The improvement stems from new high-resolution optical spectraobtained using HIRES at the W. M. Keck Observatory. The CKS stellar samplecomprises 1305 stars classified as Kepler Objects of Interest, hosting a totalof 2075 transiting planets. The primary sample is magnitude-limited (Kp < 14.2)and contains 960 stars with 1385 planets. The sample was extended to includesome fainter stars that host multiple planets, ultra short period planets, orhabitable zone planets. The spectroscopic parameters were determined with twodifferent codes, one based on template matching and the other on directspectral synthesis using radiative transfer. We demonstrate a precision of 60 Kin effective temperature, 0.10 dex in surface gravity, 0.04 dex in [Fe/H], and1.0 km/s in projected rotational velocity. In this paper we describe the CKSproject and present a uniform catalog of spectroscopic parameters. Subsequentpapers in this series present catalogs of derived stellar properties such asmass, radius and age; revised planet properties; and statistical explorationsof the ensemble. CKS is the largest survey to determine the properties ofKepler stars using a uniform set of high-resolution, high signal-to-noise ratiospectra. The HIRES spectra are available to the community for independentanalyses.

The California-Kepler Survey. I. High Resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets