Fig. 6

First SOMs processing for clean the road pattern and the cell choice. Results obtained with (a) 34 × 22, (b) 17 × 11, (c) 8 × 5 cell-sized SOM. Image created with QGIS (QGIS.org, 2024): QGIS Geographic Information System (Version 3.34.3). QGIS Association. http://www.qgis.org.