The metropolitan topobathymetric elevation model is a representation of the surface of the coastal strip, both the emerged part (dry beach) and the submerged part, up to an approximate depth of between 15 and 20 meters. The depth is represented with a regular grid of 1 meter pixel size. The emerged part is measured with topography methods, the first meters of the submerged part are measured with a single-beam echosounder and the rest is measured with a multi-beam echosounder, which provides very detailed data of the seabed.

Orthometric altitudes of the coastal strip of Catalonia, in the form of: isobaths with equidistance of 1 m; and terrain elevation model with a regular mesh of 1 m, mainly of the submerged part. This data set also includes: an orthophoto (of the coastal strip), with a resolution of 5 cm, generated from the geometric rectification after an aerotriangulation process of the images obtained in the flights combined with lidar related with the capture of the bathymetry; and a coastline that identifies the limit between sea water and the surface of the coast, classified according to the characteristics of the terrain found in each location.