Figure 1
Color shaded digital elevation models (DEMs) and orthophotos of the study area. (A) The upper right box shows a location map of the study site in South America and near Antofagasta, Chile (star symbol). The DEM (overview model) shows the surrounding terrain on which the investigated polygon network (PN) is located. The 3D-model (lower right corner) with tenfold vertical exaggeration shows the PN in an inactive channel. The letters on white background show the location of Fig. 1 C,D. (B) Maps of the close-up model show the PN with sampling locations (P1: − 24.07846, − 69.99319, P2: − 24.07741, − 69.99338, P3: − 24.07711, − 69.99337) as a shaded DEM, as an orthophoto, and the polygon classification. (C) Orthophoto of a non-eroded PN outlined by dark sand wedges, while at (D) the polygonal pattern in P3 is inverted due to eolian erosion with polygons that appear dark compared to their sand wedges. Elevation is given in meter above sea level (m a.s.l.).
