  The Kepler Mission was launched on March 6, 2009 to perform a photometric
survey of more than 100,000 dwarf stars to search for Earth-size planets with
the transit technique. The reliability of the resulting planetary candidate
list relies on the ability to identify and remove false positives. Major
sources of astrophysical false positives are planetary transits and stellar
eclipses on background stars. We describe several new techniques for the
identification of background transit sources that are separated from their
target stars, indicating an astrophysical false positive. These techniques use
only Kepler photometric data. We describe the concepts and construction of
these techniques in detail as well as their performance and relative merits.
