Transformation of slope microrelief across an unused mountain forest road - replication data

The dataset includes Digital Elevation Models (DEMs) derived from UAV-photogrammetry data collected during three measurement series on November 12, 2022, July 8, 2023, and October 19, 2023, for a forest road located in the Lejowa Valley in southern Poland. Data collection was carried out using a DJI Phantom 4RTK UAV equipped with a 1-inch CMOS camera (20MP) and a 24 mm equivalent focal length lens. The UAV was supported by an RTK GNSS module to ensure precise trajectory determination. The UAV flights were meticulously planned to achieve 80% forward and side image overlap, with a target Ground Sampling Distance (GSD) of 7 mm. Georeferencing of the UAV-photogrammetry data was ensured by utilizing a network of 25 Ground Control Points (GCPs) and 17 Check Points (CPs), whose coordinates were measured using the RTK GNSS method. The UAV-photogrammetry data processing was carried out using Agisoft Metashape Professional, which included image alignment, tie point filtration, optimization of image alignment with camera calibration parameters, and rigid transformation of the image block using GCP coordinates. Dense point clouds were generated, and DEMs were subsequently extracted. The accuracy of UAV-photogrammetry products, assessed using the CPs, is ±5-10 mm in the horizontal plane and ±5-15 mm in the vertical plane. The dataset includes DEMs for two sections of the road: the lower road section with a DEM resolution of 17 mm/px and the upper road section with a DEM resolution of 15 mm/px.