Aquesta ortofoto està elaborada a partir dels fotogrames en blanc i negre del vol fotogramètric del 1956-57 que va realitzar l'Army Map Service dels Estats Units, fruit dels acords de col·laboració militar entre aquest país i Espanya i abasta tota la regió metropolitana de Barcelona, amb una petita àrea en blanc a una zona rústica de La Llagosta.

Regular grid model of the emerged coastal strip, with a resolution of 1 m, which expresses the orthometric altitudes of the terrain with the existing constructions in the territory (buildings, walls and other structures).

Regular grid model of the emerged coastal strip, with a resolution of 1 m, which expresses the orthometric altitudes of the terrain with the existing constructions in the territory (buildings, walls and other structures).

Regular grid model of the emerged coastal strip, with a resolution of 1 m, which indicates the orientation of the slope at each point of the terrain with respect to north.

Orthoimage representing the normalized difference vegetation index (NDVI), with a resolution of 1 m. This index makes it possible to estimate the quantity, quality and development of vegetation, based on the normalized difference between the radiation reflected in the infrared band of the electromagnetic spectrum with respect to the red band of the visible spectrum. This set of information is distributed in 2 by-products: Real NDVI orthoimage, where each pixel takes the real value of the index in question (between -1 and 1), in such a way that it facilitates exhaustive studies but requires advanced software; 8-bit NDVI orthoimage, where each pixel takes the value of the index in question but discretized to an integer range between 0 and 200, so that it facilitates an overview.

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.

Regular grid model of 1 meter resolution, from all over Catalonia, which expresses the orthometric altitudes of the surface of the territory, including the natural and artificial elements found on the ground (trees, buildings, etc.).

Regular grid model of the emerged coastal strip, with a 1 meter resolution, which expresses the orthometric altitudes of the surface of the territory, including the natural and artificial elements found on the ground (trees, buildings, etc.).

Regular grid model of the emerged coastal strip, with a 1 meter resolution, which expresses the orthometric altitudes of the terrain, without the elements that may be above it (buildings, vegetation, etc.).

Orthoimage representing the normalized difference vegetation index (NDVI), with a resolution of 1 m. This index makes it possible to estimate the quantity, quality and development of vegetation, based on the normalized difference between the radiation reflected in the infrared band of the electromagnetic spectrum with respect to the red band of the visible spectrum. This set of information is distributed in 2 by-products: Real NDVI orthoimage, where each pixel takes the real value of the index in question (between -1 and 1), in such a way that it facilitates exhaustive studies but requires advanced software; 8-bit NDVI orthoimage, where each pixel takes the value of the index in question but discretized to an integer range between 0 and 200, so that it facilitates an overview.