The (hydrographic) surveyor concerns himself with measurements. The tide, the current, the depth, the sea floor and the progress: all these data are required for the extraction of sand and the construction of Maasvlakte 2. These measurements are conducted both off-shore and on-shore. The data are processed into maps, tables and graphs. They show the progress of the activities and serve as a foundation for the further dredging and land reclamation process.