Every page psammite has published — the certificate storefront, the shoreline-change maps, the visualizations built from the federal record, and the dispatch. Nothing buried.
The storefront. Enter an address and get a parcel-level screening — erosion rate, surge exposure, and whether the next step is a licensed survey.
Assess an address →See exactly what a finished Certificate of Coastal Impact looks like before you order one.
Open the sample →The South Shore of New York, Montauk to Breezy Point — 3,518 USGS transects showing where the coast is eroding, holding, or gaining.
Open the map →The Pacific edge: bluff retreat and shoreline change along the California coast.
Open California →A flyover of the full South Shore barrier system, end to end.
Take the flyover →A timelapse of the South Shore homes the ocean has taken — plotted from the record.
Watch the timelapse →The Fire Island breach: the bay live right now, the flooding argument, and the full record of what the open decade changed.
Watch the bay live →How groins and longshore drift move sand down the coast, and who pays for it.
Follow the sand →The 1938 hurricane opened Shinnecock Inlet in a single afternoon. This is that cut.
See 1938 →The two high-risk coastal flood zones, side by side — what the wave-velocity hazard means and why VE is built differently.
Compare the zones →FEMA's Coastal High Hazard Area: the 3-foot wave rule, the LiMWA line, and how a house stands on open piles.
Read the explainer →What BFE means, what datum it's measured from, and how your freeboard is figured against it.
Understand BFE →The USGS Digital Shoreline Analysis System — EPR, LRR, and how we know how fast a coast is moving.
Learn DSAS →Find your address in the NFHL, read your zone and Base Flood Elevation, and locate the FIRM panel.
Read the map →