Ground Subsidence Dataset

Satellite-derived vertical ground movement at the parcel level — 182,000+ parcels in Caddo and Bossier parishes, calibrated against a permanent geodetic reference station.

182K+

Parcels

−6.1

Caddo Median mm/yr

−10.2

Bossier Median mm/yr

24,661

Multi-Track Caddo

About this product

Ground movement is measured using dual-pass satellite radar, cross-referenced against a NOAA geodetic station to remove atmospheric bias and anchor measurements to an absolute reference frame. Where two independent satellite passes cover the same parcel, values are averaged — producing higher-confidence results across most of the coverage area.

The dataset covers 107,074 Caddo parcels and 74,928 Bossier parcels. 117,734 parcels across both parishes exceed the −5 mm/yr threshold — the rate at which cumulative settlement becomes structurally meaningful over a 20–30 year mortgage horizon.

This is a velocity dataset — ground movement rate only. For flood-specific risk analysis incorporating elevation and FEMA flood zone boundaries, see the Flood Zone Encroachment Analysis.

Buyers

→ Mortgage lenders assessing long-term collateral risk
→ Insurance underwriters pricing foundation exposure
→ Municipal engineers prioritizing infrastructure inspection
→ Environmental consultants and geotechnical firms

Delivery

·CSV or GeoJSON, parcel-level
·Fields: GEOGNO / parcel ID, velocity_vert_mmyr, confidence tier
·Quarterly refresh as new satellite imagery is processed
·Caddo and Bossier parishes covered

Dataset Fields

geogno / parcel_id

15-digit Caddo join key or Bossier parcel identifier

velocity_vert_mmyr

Vertical ground movement rate in mm/yr (negative = subsidence). Multi-track average where both tracks cover the parcel; single-track otherwise.

velocity_vert_t63_mmyr

Track 63 individual velocity, CORS-calibrated. Offset −28.16 mm/yr applied.

velocity_vert_t136_mmyr

Track 136 individual velocity, CORS-calibrated. Offset −8.10 mm/yr applied.

confidence

'multi-track' (both tracks cover parcel — higher confidence) or 'single-track'

latitude / longitude

Parcel centroid coordinates

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