FREE NETWORK SOLUTIONS WITH THE DLT METHOD

The photogrammetric inner constraints, which are used for the derivati on of free network solutions in close-range applications, are derived for the case where the Direct Linear Transformation model is used in t he adjustment of the observations. The derivation is based on the fact that the inner constraint matrix is the transpose of the matrix of th e derivatives of the unknown paraMeterS with respect to transformation parameters of the reference frame. This matrix of derivatives is deri ved directly by studying the variation of the DLT parameters caused by an infinitesimal change of the reference frame. This is achieved from the known corresponding variation of the bundle parameters and the kn own direct and inverse relations between DLT and bundle parameters.