  Background: Measurements of the polarization observables {\Sigma}, P, T, Ox,
Oz for the reaction {\gamma}p {\rightarrow) KS0 {\Sigma}+ using a linearly
polarized photon beam of energy 1.1 to 2.1 GeV are reported. Purpose: The
measured data provide information on a channel that has not been studied
extensively, but is required for a full coupled-channel analysis in the nucleon
resonance region. Method: Observables have been simultaneously extracted using
likelihood sampling with a Markov-Chain Monte- Carlo process. Results: Angular
distributions in bins of photon energy E{\gamma} are produced for each
polarization observable. T, Ox and Oz are first time measurements of these
observables in this reaction. The extraction of {\Sigma} extends the energy
range beyond a previous measurement. The measurement of P, the recoil
polarization, is consistent with previous measurements. Conclusions: The
measured data are shown to be significant enough to affect the estimation of
the nucleon resonance parameters when fitted within a coupled-channels model.
