From differential cross-section data π±p elastic and charge scattering as well as from the polarizations of the elastic processes we evaluate the πN scattering amplitudes for energies between 1.5 and 14 GeV and momentum transfers between -0.05 and -0.4 (GeV/ c) 2. Our analysis starts from approximations of the amplitudes which are improved b by iteration, using fixed- t dispersion relations and the experimental data. The resulting charge exchange amplitudes show a structure consistent with the dual absorptive model. We found no indication that tensor exchange is present in the case of the isospin even amplitudes. Although not used in the analysis our amplitudes give the charge exchange polarization and spin rotation parameters in agreement with measurements.