  The combined measurements of proton's structure functions in deeply inelastic
scattering at the HERA collider provide high-precision data capable of
constraining parton density functions over a wide range of the kinematic
variables. We perform fits to these data using transverse momentum dependent
QCD factorization and CCFM evolution. The results of the fits to precision
measurements are used to make a determination of the nonperturbative transverse
momentum dependent gluon density function, including experimental and
theoretical uncertainties. We present an application of this density function
to vector boson + jet production processes at the LHC.
