Remarks on some problems in the combination of station coordiÃœnate and velocity solutions

The individual solutions may be unconstrained, partly constrained, minimum constrained, loosely constrained, or over-constrained with respect to the realization of the datum parameters, i.e., the definition of the necessary 7 parameters in case of stationary three-dimensional coordinates (3 translations, 3 rotations, 1 scale) or 14 parameters for kinematic coordinates (the same for the velocities).