Dear Micha,

On which deformation analysis method is the displacement determination within the JAG3D software based and does it have any specific name?
Also, what is the difference between the Karlsruhe deformation analysis method and the method used in JAG3D?

Best regards,
Karlo

Hello Karlo,

On which deformation analysis method is the displacement determination within the JAG3D software based and does it have any specific name?

It can be interpreted as a generalization of Baarda's data snooping/DIA approach and is not essentially different from the classical outlier test. Thus, the congruence analysis is based on the original observations. A description is given by Lösler et al. (2017).

Also, what is the difference between the Karlsruhe deformation analysis method and the method used in JAG3D?

Like the Hanoverian approach, the Karlsruhe deformation analysis method is based on two independent (separately) adjusted networks. The estimated coordinates of both epochs are analysed for changes using the fully-populated dispersion matrices obtained from the separate network adjustments. The difference lies in the test procedure, i.e. the Hanoverian approach uses implicit hypothesis tests (i.e. global tests) and the Karlsruhe approach uses explicit hypothesis tests to localize unstable points. The Karlsruher approach is described by Illner (2008).

In contrast to the separate adjustment of the networks of both epochs, JAG3D combines the two epochs at the observation level in an overall network adjustment. The test procedure corresponds to the explicit procedure of the Karlsruhe approach.

Best regards
Micha