This work is part of the Extersial II project (continuation of the environmental externalities project in local agro-food systems), which aims to study the environmental externalities of olive cultivation in Spain, developing indicators to quantify each of them. One of the negative externalities studied in the project is the laminar erosion of the ground (potentially), for which the most common global analytical tool is the RUSLE equation (Renard et al., 1997). This method develops different parameters, all of which relate to the spatial domain, as it is calculated on the basis of characteristics inherent to each position on the ground (height, slope, orientation, etc.). This makes SGIs an indispensable tool for work. However, there is a wide variety of methods proposed for the calculation of those parameters; therefore, before implementing this equation in ArcMAP, it is necessary to carry out a comparative study of these methodologies and their results. Our starting point was the MDE (Digital Elevations Model) of 5 m mesh passage available at the CNIG-IGN download centre. The calculation process has required multiple algebraic operations with raster layers, the creation of several intermediate layers or different comparisons and combinations between them; in addition to the need for other types of elements, such as the hydrological model. The result of the work is a consistent methodology for the calculation of potential laminar erosion through ArcMAP; this has made it possible to fully estimate the potential laminar erosion model of the Sierra Mágina region (Jaén).