This contract aimed at developing a methodology for urgently producing mapping, to be presented as a viable alternative to the aerophotogrametric methods. This mapping was produced from very high definition stereoscopic satellite imagery.

Topographic surveys were also carried out, by using classic topography methods, namely double frequency GNSS sensors and total stations

The architectural studies comprised the production of plans for all the floors, cross and longitudinal sections, as well as the front elevations required for developing the rehabilitation project.

It was necessary to acquire very high definition stereoscopic satellite imagery, for all the study area, from which planialtimetric mapping at scale 1:5000 was produced.

All the classic methods topography used, by using double frequency GNSS sensors and total stations, allowed carrying out a more detailed survey of the water treatment plants and tunnel portals of the main pipeline.