NJ Parcel Flood Risk Dashboard

What this is

A statewide dashboard joining New Jersey’s MOD-IV tax-assessment records to parcel geometry, intersecting every parcel with current FEMA flood layers and future climate/sea-level-rise layers, and scoring each 0–100 with its drivers visible. The audience is underwriting and portfolio review: search by address or PAMS PIN, filter by county and municipality, and read exposure by property class as both a parcel count and an assessed-value total.

It extends GeoFloodFin — five cities, 203 tracts — to the whole state at parcel grain. The narrative hook is the productisation: the same analytical question, asked at a scale where the engineering is the hard part.

Design decisions already locked

The whole thing is precompute-everything: no server, no runtime geoprocessing. Heavy intersection runs locally, partitioned by county and resumable so a failure never restarts finished work. What ships is tiles, Parquet, and small JSON summaries on object storage, read directly by a static app.

Two rules are non-negotiable in the guide. No owner names or mailing addresses appear in any published artifact. And NFIP loss evidence is aggregated to census tract, never to parcel — the redacted claims dataset does not support parcel-level precision, and pretending otherwise would be both wrong and a privacy failure.

Publication gates are written before the first line of code: MOD-IV join rate ≥ 97% statewide, county parcel counts within ±2% of source, geometry validity 100% after repair.