The Geowork IV is the instrument for carrying out the soil map at 1:25,000 scale. The soil map is a pedological content that spans the entire area of Catalonia, divided in 304 sheets defined as the formal basis 1:25,000. The availability of information on the physical and chemical soil, while they are limited and nonrenewable resources, is essential for land management in agricultural areas, land planning, civil engineering and environment in the sense broadest.

The soil map today, is done in collaboration with the Ministry of Agriculture, Livestock, Fisheries and Food, which provides detailed information around 25% of the area of Catalonia, which corresponds mainly to agricultural areas.

Field soil information is mainly obtained by performing test pits with a density of 0.5 comments per square centimeter of the final map on agricultural land and 0.25 square centimeter observations of the final map on forest land. Again, include the importance of the collaboration of municipalities, which facilitate the implementation aspects of the pits and collection of field data. The samples are subjected to various types of analysis to determine various parameters such as the organic carbon content, salinity, grain size and other parameters that define the different types of soils.

The legend of the sheets in the format of publication is divided into physiographic units, and within them, geomorphological units. Each unit contains a number of geomorphological mapping units, which represent groups of common characteristics soils.