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    Borehole geophysical logging techniques are based on measuring and recording continuously the physical properties of interest along a borehole using different probes. Analysis of the correlation between the different records (logs) allows to characterize lithological section and formation fluids.

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    The boreholes database is an inventory of subsurface data in Catalonia through the collection of available geological and geotechnical survey information. The surveys are classified into three groups: surveys, penetrometers and trial pits.

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    Vertical Electrical Sounding (VES) is a electrical resistivity method that involves injecting current into the earth and measuring the potential difference between a pair of points. In this way, apparent resistivity of the subsoil as a function of depth can be obtained. VES technique can be applied to a wide range of studies with a maximum investigation depth of about 200 m depending on the acquisition system.

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    This method puts emphasis on the measurement of anomalies of the Earth's magnetic field, caused by the presence of reservoirs or structures on the subsurface. This technique allows to assess changes of nT in the Earth's magnetic field caused by the presence of some minerals. Those minerals are characterized by high magnetic susceptibility such as the magnetite.

  • The Soil Map at a scale of 1:25 000 is a map of edaphological content covering the entire surface of Catalonia, divided into 304 sheets defined according to the official 1:25 000 cut. It is a cartographic document that provides an overview of the edaphic structure of the country and, in summary, provides information on the distribution of soils in the territory, their morphologies, and their physical, chemical and biological characteristics. GT IV is the instrument for the realization of the Soil Map 1:25 000.

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    Seismic reflection method is based on the propagation of seismic waves inside the earth. This method analyzes the reflected waves which are generated on or near the surface by a seismic source, travel down into the ground, reflect at a discontinuity (density and velocity contrast) and travel back up to the ground surface. Digital processing of seismic reflection data offers the opportunity to create cross-sectional images of the subsurface (seismic reflection section) showing the amplitude of the reflected wave at the correct horizontal and depth coordinate of the reflection point.

  • The Soil Map of Catalonia 1: 250 000 is the result of the synthesis of the edaphological data available at the time of its preparation, in 2018. This process, carried out by the Cartographic and Geological Institute of Catalonia, has consisted of in the compilation, analysis and correlation of the cartographic information obtained in the different soil mapping works that have been executed in Catalonia since the 70's of the last century.

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    Information regarding an avalanche observed recently. Mapped based on direct observation of the event or observation following it. The information is obtained based on the nivometeorological observation network, rescue groups, countryside wardens, mountain guides, and ski and mountain resort personnel. In the event of important episodes and accidents the IGC technicians also gather information. The elements mapped mainly include the extent to which avalanches affect populated areas, roads, ski resorts and people who carry out mountain activities. Data began to be gathered in 1986. It is shown in blue.

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    The map contains the land values in Barcelona in 1995.