Over the past two decades, in the Belgorod region there has been a spread of woody vegetation along the erosional network. One of the forms of this process is the formation of open woodlands. In this work, we research the density of trees in such light forests. On the territory of the Belgorod region, we chose 200 sites with an area of 1 ha each. We mapped trees inside the sites using mosaics of satellite images Google Map. For this, we used the QGIS program and the plugin Quick Map Services. Based on these data, by interpolation, maps of changes in the density of trees in open woodlands were constructed. To show local variation, interpolation by the method of inverse-weighted distance is used. To identify trends at the subregional and regional level, we applied smoothing interpolation (based on a locally weighted mean according to the Nadaraya-Watson formula.) with a bandwidth of 20 and 50 km, respectively. We performed the interpolation in the environment for statistical computing R using an additional spatstat package. Among 200 plots, tree density ranged from 21 to 415 pcs / ha. On average, it was equal to 111.2 pcs / ha. At the local level, there are no clearly visible patterns. At the subregional level, alternation occurs when moving from west to east areas with increased and reduced density of trees open woodlands. At the regional level, there is a decrease in tree density when moving from the northwest to the southeast.