  We describe the X-ray analysis procedure of the on-going Chandra
Multiwavelength Plane (ChaMPlane) survey and report the initial results from
the analysis of 15 selected anti-Galactic center observations (90 deg < l < 270
deg). We describe the X-ray analysis procedures for ChaMPlane using
custom-developed analysis tools appropriate for Galactic sources but also of
general use: optimum photometry in crowded fields using advanced techniques for
overlapping sources, rigorous astrometry and 95% error circles for combining
X-ray images or matching to optical/IR images, and application of quantile
analysis for spectral analysis of faint sources. We apply these techniques to
15 anti-Galactic center observations (of 14 distinct fields) in which we have
detected 921 X-ray point sources. We present logN-logS distributions and
quantile analysis to show that in the hard band (2 - 8 keV) active galactic
nuclei dominate the sources. Complete analysis of all ChaMPlane anti-Galactic
center fields will be given in a subsequent paper, followed by papers on
sources in the Galactic center and Bulge regions.
