MEASURED — DECISION_USEFUL_CHANGE_DETECTED
Derry Municipal Landfill (NH)
Volume change between 2011 and 2019, measured from two independent real LiDAR epochs, calibrated against a stable-terrain control ring.
| Field | Value |
|---|---|
| Epochs | 2011 → 2019 |
| Volume change | 60.6 ± 2.8 m³ |
| Coverage | 94.9% |
| Stable-control sigma | 0.0956 m |
| Classification | DECISION_USEFUL_CHANGE_DETECTED |
Machine-readable measurement (full evidence, same numbers as this page):
lmop-21052.json
Method: measure_physical_change() — same unmodified function used across every site in this program, real LiDAR/3DEP epochs via the public hobuinc/usgs-lidar EPT index, calibrated against a stable-terrain control ring. Synthetic 200x200m buffer on the LMOP-declared coordinate — never the legal parcel boundary. Full method: /products/physical-change/.