Soil erosion is a product of natural and anthropogenic factors and, at the same time, an economic and environmental concern. One of the methods applied to calculate the intensity of erosion is the erosion potential method (EPM), with two possible procedures for determining the average erosion coefficient of an area: analytical and graphical. Using GIS and EPM methods, without field observations of erosion, based on cartographic materials and satellite images, erosion maps were created for 1970 and 2018, for part of the peri-urban area of Belgrade. Based on the created erosion maps, the values of the mean coefficients of erosion, as well as the arithmetic means for the study area, were determined for the settlements. The aim of the study is to assess the reliability of the mean coefficient of soil erosion, obtained from the erosion map created from the cartographic materials and satellite images, without field observations of erosion. Thus, the obtained values of the mean erosion coefficient were compared with the values obtained from the erosion map with field observation and the values obtained by the analytical procedure. Statistical analysis (F test) for 1970 and for 2018 determined a high degree of reliability (p < 0.05) of the mean erosion coefficients of the area obtained from erosion maps that were created from cartographic materials and satellite images without field observation. Regardless of the procedure for determining the mean erosion coefficient, a significant decrease in soil losses was observed, from 10.64 to 5.97 t ha−1year−1 (average annual specific production of sediments, year 1970 and 2018, respectively).