verified_negatives
50 real, LiDAR-verified stable-ground polygons (hard negatives) from two independent
PNOA-LiDAR campaigns (2019/2024), Ibiza, Spain — the negative calibration set for the
same physical method used to measure real volume
change at the Ca na Putxa landfill. Every polygon carries a real
NO_CHANGE_DETECTED verdict, not a synthetic placeholder.
What this is
Change-detection methods need real negative examples — terrain that genuinely did not
change between two LiDAR epochs — to know what "no signal" honestly looks like. Most
published benchmarks only show positives. This set is the calibration ring's real
output: 50 polygons where the same measure_physical_change() method used
elsewhere in this project confirmed no significant change, with the same evidence
discipline (real point counts, real coverage, real uncertainty).
Where to get it
Hosted on both platforms with the same bilingual (EN/ZH) dataset card:
License
CC-BY 4.0. PNOA-LiDAR attribution preserved as required by the source license.
Cite this dataset
NKO Data Labs. NKO Verified Negatives - Ca na Putxa (LiDAR hard negatives). Zenodo. https://doi.org/10.5281/zenodo.22283715