Datum keeps a live watch on your coastal home — the tide, the storm surge, the road out — and warns the people who matter the moment it's time to leave. Start with a free read of your address.
Start with a free read. Add the certificate if you're in a transaction. Keep the live watch if it's your home.
A free federal-data read on erosion and storm-surge exposure — the headline, in seconds.
Buying, selling, or closing? The full six-exhibit document, every figure sourced to the record — a one-time snapshot for the transaction.
Your home? Keep watching. The tide, the surge, the road out — and a warning to your people the moment it's time to leave.
A certificate tells you what the sea has done. Datum tells you what it's about to do — tonight. A live watch on your home that reads the bay every few minutes, projects the storm surge forward, and warns the people who matter the moment the water threatens the road out.
Your observed tide over the predicted tide, the surge between them, and the forecast cresting over your road — seven days back, two days ahead.
SMS and email the instant it's time to leave. Multiple contacts, quiet hours, and a LEAVE-NOW that always gets through.
Your first-floor elevation, the bay level your street floods at, and how much lead time you need — set per house.
“The coast was never going to hold still — but it does leave a record.”
In ten months — 93% of the measured beach — differenced straight from Sentinel-2 satellite imagery. We didn’t model it. We measured it. On the reach report, the projected waterline is drawn over the houses that are still standing.
See the Westhampton reach report →Read a real one — the Camp Hero bluffs at Montauk Point, eroding 3.1 ft/yr with the recent rate running 2.67× the century average. Every figure traces to a federal source.
The screening layer before the field report: rate, setback, horizon, storm exposure, uncertainty, and a clear recommendation on whether licensed site review is warranted.
Long-term and recent erosion rates with a 90% confidence interval, and your distance to the mapped shore.
Every historical survey since the 1800s, plotted — the sea drawing measurably nearer, decade by decade.
Your surge depth by category, the storms that have passed, and an escape plan built for your parcel's regime.
The seafloor that decides how much storm-wave energy reaches your bluff toe — the cause behind the rate.
Source vintage, confidence intervals, coverage limits, and the field conditions an automated screen cannot verify.
A single, dated finding: stable, watch, elevated, or critical — and the years until the edge reaches the house.
Compiled from the public archives of the U.S. Geological Survey and the National Oceanic and Atmospheric Administration. The certificate cites every dataset by name.
For a buyer in diligence, an attorney at closing, or a lender underwriting the collateral — a one-time snapshot of the ground, every figure sourced to the federal record.
Keeping the house? A one-time snapshot ages the moment the next storm moves the shoreline — Datum keeps watching for as long as you own it. Keep a live watch →
Psammite assembles the pre-field due-diligence packet in seconds and feeds you the leads in your exclusive territory — you keep the survey, permit, and design work. Intake infrastructure for your firm, not a competitor.
Claim your territory →