Mining Pits at Písečný vrch

The dataset is provided as UTF-8 encoded CSV files with semicolon-separated values. Spatial coordinates are referenced in the S-JTSK / Krovak East North coordinate reference system (EPSG:5514). The accompanying analysis script, maxent_analysis.R, was written in R and contains the full Recency Index modelling workflow. It requires the R packages tidyverse, maxnet, pROC, patchwork, dotwhisker, car and corrr. The script uses data_table.csv as the input file and exports data_table_with_predictions.csv with Recency Index predictions, threshold-based classification, leave-one-out cross-validation predictions and bootstrap-derived uncertainty metrics.

The script also performs predictor preparation, multicollinearity assessment using Spearman correlations and VIF, AICc-based MaxEnt model tuning, model fitting, ROC/AUC evaluation, Youden Index thresholding, predictor importance analysis, response curve generation and prediction uncertainty assessment. A single random seed is set for reproducibility, and 500 bootstrap replicates are used for resampling-based uncertainty estimates. The script additionally produces supplementary outputs, including the AICc tuning table and figures used for model validation, predictor interpretation and uncertainty visualisation.

Airborne lidar data for the Písečný vrch area were collected in June and July 2024 using a Riegl VQ-1560 II-S system and are referenced to S-JTSK / Krovak East North (EPSG:5514), with an average point density of approximately 12 points/m². Ground-classified points provided by AERIMAP, s.r.o. were used to generate a 0.5 m DEM for surface relic interpretation and a secondary 10 m DEM, aggregated by binning interpolation in ArcGIS Pro, for comparison with the 1958 hDEM.