Premstaller Geotechnik CPTu and SCPTu soundings — curated Parquet for the conic library

Curated CPTu and SCPTu subsets of the Premstaller Geotechnik cone penetration test dataset (Oberhollenzer et al., 2021), prepared as analysis-ready Parquet files for the conic library. The original combined CSV was filtered by test type into two files — piezocone (CPTu) and seismic piezocone (SCPTu) — retaining measured inputs and supplied stresses. Derived/normalized columns from the source were omitted, as they are meant to be recomputed. Cleaning steps: empty cells parsed as nulls; one concatenated profile (original ID 576) repaired by dropping its non-advancing rows; rows at exactly equal depth within a sounding collapsed to one by averaging the measurements; negative sleeve friction (fs) truncated to zero; rows with no usable cone reading (qc and fs both empty) dropped. A dense per-file key (Sorted ID) was assigned while preserving the source identifier (Original ID); basin/valley labels were kept as a title-cased Location column; and a per-Location cone area ratio (Area ratio (-)) was added, snapped to the physical band reported by the source. Files are sorted by sounding and depth and stored as zstd-compressed Parquet. Changes in this version (v2): Added a per-Location cone area ratio column (Area ratio (-)). Collapsed exactly-equal-depth rows within each sounding (mean of measurements). Truncated negative sleeve friction to zero and dropped rows with no usable cone reading. Soundings unchanged (CPTu: 312; SCPTu: 50); row counts differ from v1 due to the cleaning above. This curated derivative is released under CC BY 4.0. Changes are limited to filtering, splitting, cleaning, re-keying, area-ratio derivation, and format conversion. Original dataset: Oberhollenzer, S., Premstaller, M., Marte, R., Tschuchnigg, F., Erharter, G.H., Marcher, T. (2021). Cone penetration test dataset Premstaller Geotechnik. Data in Brief, 34, 106618. https://doi.org/10.1016/j.dib.2020.106618