The coastline is supposed to belong to everyone. Under the ancient legal concept of the Public Trust Doctrine, the ocean shore is a public commons, held in trust by the state for the benefit of the people. But if you've tried to lay out a towel on certain stretches of the Florida, California, or New Jersey coastlines recently, you know the reality looks very different.
What we are witnessing is the slow, creeping privatization of the public shoreline. It doesn't always happen with a dramatic land grab. More often, it happens with a quiet sign that says "Resort Guests Only," or a row of identical, pre-setup lounge chairs that effectively monopolize the sand from the dune line to the high tide mark.
"When a family has to pay a resort $100 just for the 'privilege' of sitting on public sand, the public trust has been broken."
The Anatomy of Beach Privatization
The tactics of commercial monopolization are subtle but devastating to public access. Resorts, private beachfront communities, and rental companies exploit regulatory gray areas to claim public land. They deploy "vendor chairs"—seas of empty rentals that sit vacant but take up the prime real estate, forcing regular families to cram into the margins.
They employ private security guards who unlawfully tell locals to move along. They construct fences that technically stop at the property line but functionally block lateral access along the beach. They lobby for hyper-local ordinances that restrict public parking or ban "BYO" (Bring Your Own) umbrellas, creating an economic barrier to entry.
Enter the Open Sands Index (OSI)
We built the Open Sands Index™ (OSI) because we believe you can't fight what you can't measure. OSI is a React 19 + Mapbox Progressive Web App designed to score US beaches and beachfront properties on their true accessibility and "BYO-friendliness."
Instead of relying on glossy tourism brochures, OSI uses a composite scoring engine to calculate the actual state of the sand. The engine aggregates four critical data streams:
- Regulatory Data: We track local municipal codes, parking restrictions, and vendor permitting laws to identify areas where public access is being legislated away.
- Geospatial & Satellite Analysis: We monitor shoreline usage patterns, tracking the physical footprint of commercial vendor chairs versus open sand available for the public.
- NLP (Natural Language Processing): We analyze thousands of property reviews and public comments to detect instances of "private security harassment" or "no space to sit."
- Crowdsourced Ground Truth: Users on the beach can drop pins and submit real-time reports of blocked access, illegal signage, or excessive vendor monopolization.
Data as an Advocacy Tool
The resulting OSI score (0-100) tells a family exactly what to expect before they pack the car. A score of 95 means wide open public sand, easy access, and a welcoming environment for your own chairs and coolers. A score of 20 indicates a heavily commercialized zone where you'll likely be fighting for space or pressured to rent equipment.
But OSI is more than just a trip-planning tool; it's a weapon for advocacy. By aggregating this data, we provide coastal activists, journalists, and state-level regulators with the hard evidence needed to challenge illegal privatization. When a resort claims they are simply providing a "service," our data shows exactly how that service is systematically excluding the public.
The Road Ahead
The fight for the shoreline is fundamentally a fight for equity. The beach should not be a luxury commodity reserved only for those who can afford beachfront property or expensive resort fees. It is a shared natural resource.
Through the Open Sands Index, we are putting the power of data back into the hands of the public. We are mapping the coast, one beach at a time, to ensure that the sand stays open for everyone.