PANDA Deformation Analysis

With the results of observations taken in two epochs, a deformation analysis can be calculated, to determine the displacements of individual points.

For structural surveillance, a two-stage analysis can be performed, dividing the monitoring net into Reference und Object points. Presuming that the reference points are in a stable condition, the object points are tested for significant misclosures.

A global congruency test is the core of the analysis, finding significant misclosures amongst the reference points. This test considers the complete cofactor matrices of both epochs. If cofactor matrices are not available, or if only point accuracies have been determined, then an aproximation analysis is possible.

Displaced points can be determined by either a backwards or a forwards method.

• When using the backwards method, displaced points will be successively taken out of the group of reference points, until no further misclosure of the remaining reference points can be found.
• The forward method begins with presumably stable reference points and successively adds points to the group of reference points, until a significant misclosure occurs!