  We expand on the dispersion analysis of polarimetry maps toward applications
to interferometry data. We show how the filtering of low-spatial frequencies
can be accounted for within the idealized Gaussian turbulence model, initially
introduced for single-dish data analysis, to recover reliable estimates for
correlation lengths of magnetized turbulence, as well as magnetic field
strengths (plane-of-the-sky component) using the Davis-Chandrasekhar-Fermi
method. We apply our updated technique to TADPOL/CARMA data obtained on W3(OH),
W3 Main, and DR21(OH). For W3(OH) our analysis yields a turbulence correlation
length $\delta\simeq19$ mpc, a ratio of turbulent-to-total magnetic energy
$\left\langle B_{\mathrm{t}}^{2}\right\rangle /\left\langle B^{2}\right\rangle
\simeq0.58$, and a magnetic field strength $B_{0}\sim1.1\:\mathrm{mG}$; for W3
Main $\delta\simeq22$ mpc, $\left\langle B_{\mathrm{t}}^{2}\right\rangle
/\left\langle B^{2}\right\rangle \simeq0.74$, and $B_{0}\sim0.7\:\mathrm{mG}$;
while for DR21(OH) $\delta\simeq12$ mpc, $\left\langle
B_{\mathrm{t}}^{2}\right\rangle /\left\langle B^{2}\right\rangle \simeq0.70$,
and $B_{0}\sim1.2\:\mathrm{mG}$.
