  We present results from a comprehensive partial-wave analysis of pi+-p
elastic scattering and charge-exchange data, covering the region from threshold
to 2.1 GeV in the lab pion kinetic energy, employing a coupled-channel
formalism to simultaneously fit pi-p\to\eta n data to 0.8 GeV. Our main result,
solution FA02, utilizes a complete set of forward and fixed-t dispersion
relation constraints, from threshold to 1 GeV, and from t = 0 to -0.4
(GeV/c)^2, applied to the piN elastic amplitude. A large number of systematic
checks have been performed, including fits with no charge-exchange data and
other database changes, fits with few or no dispersion relation constraints,
and changes to the Coulomb correction scheme. We have also reexamined methods
used to extract Breit-Wigner resonance parameters. The quality of fit to both
data and dispersion relation constraints is superior to our earlier work. The
results of these analyses are compared with previous solutions in terms of
their resonance spectra and preferred values for couplings and low-energy
parameters, including the piNN coupling constant.
