Surveying is an indispensable part of each building project, both then and now. Exact controls are absolutely necessary when planning and implementing the project as well as when checking the quality. Today's master builders, however, benefit from the most up-to-date measuring methods and means.
 
The Frauenkirche's precise building plot had to be defined in the same way as each building owner stakes out the area where their building will be erected. However, this was done not only horizontally but also vertically. A fixed point network was defined in the plane. The floor area was divided into grid squares which facilitated subsequent orientation and assignment. This allowed a precise description of the ruin parts and an exact specification of where the main axes of the Frauenkirche had to run. A so-called altitude point network was defined in the vertical so that invariable altitude points could also be defined.
 
It was now possible to check whether the structural parts were in the right position and altitude and whether the subsoil or the masonry itself would deform with an increasing load, for example, just like in a three-dimensional system of coordinates. Continuous variance comparison ensured the necessary precision and avoided extraordinary tensions in the structure.
 
Custom-developed computer programs were used for permanent surveying. These allowed three-dimensional representations: all structural parts could thus be mapped spatially and their positions in the structure could be predefined and subsequently checked.