Table 5.
Procedures of post-processing of TLS data, defined in three case studies.
| CASE STUDY 1 Controlled Point Network |
CASE STUDY 2 Point Clouds |
CASE STUDY 3 Surface Mesh |
|
|---|---|---|---|
| Methodology of determining displacements by TLS | periodic comparison of changes in the spatial position of elements of the controlled point network | periodic comparison of point clouds by generating differential point cloud models of the main bridge girders, analysis of vertical displacements | periodic comparison of surface models by generating differential surface models of the main bridge girders, analysis of vertical displacements |
| Reference measurements | displacements of elements of the controlled point network, determined by reflectorless tacheometry | the vertical displacements of nodes of the main girders, determined by precise leveling | the vertical displacements of the nodes of the main girders, determined by precise leveling |
| - | point clouds of the object | - | |
| Sets of input TLS data | registered point clouds of the object, with the georeferenced control network | registered point clouds of the object, with the georeferenced control network | registered point clouds of the object, with the georeferenced control network |
| - | second set of input data with the use of filtration algorithms | second set of input data with the use of filtration algorithms |