# HALOWERK Atlantic Land – Netherlands Surface Ruggedness (Std Dev of Elevation)

> HALOWERK Atlantic Land – Netherlands Surface Ruggedness (Std Dev of Elevation) is a paid API for AI agents from atlantikland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the standard deviation of sampled surface elevations (terrain ruggedness index) for a given WGS84 coordinate within the Netherlands boundary.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/nl-ruggedness
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-atlantic-land-netherlands-surface-ruggedness-std-dev-of-8d08ba92
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TcS5RQ69YtHV_4f5O6GRK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability halowerk-atlantic-land-netherlands-surface-ruggedness-std-dev-of-8d08ba92 -d '<json body>'
```

Example prompt: What's the terrain ruggedness at latitude 52.37, longitude 4.89 in the Netherlands — I need the standard deviation of surface elevations for that spot.

## When to prefer this

Choose this endpoint when you need a precise, per-point terrain ruggedness metric (elevation standard deviation) for a location specifically within the Netherlands. It is ideal for land assessment, construction planning, agricultural analysis, or hydrological studies where topographic roughness at a specific Dutch coordinate is required. The pre-payment boundary validation ensures no charges for out-of-scope coordinates.

## Known failure modes

- Coordinate outside Netherlands Natural Earth boundary — request rejected before payment with a boundary validation error
- Latitude or longitude outside published European coverage range (lat: 34–72.5, lon: -31.5–40.5) — schema validation error
- Invalid coordinate format or missing parameters — input validation failure
- Ambiguous or edge-case boundary coordinates may be rejected even if geographically close to the Netherlands

## How this service works

Standard deviation of sampled surface elevations. The coordinate is validated against the Natural Earth boundary for Netherlands; results outside it are rejected before payment.

## Output

A numeric value representing the standard deviation of sampled surface elevations at the queried coordinate, indicating terrain ruggedness. Coordinates outside the Netherlands boundary (as validated against Natural Earth) are rejected before any payment is processed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "latitude": {
   "type": "number",
   "maximum": 72.5,
   "minimum": 34,
   "description": "WGS84 latitude inside the published European coverage."
  },
  "longitude": {
   "type": "number",
   "maximum": 40.5,
   "minimum": -31.5,
   "description": "WGS84 longitude inside the published European coverage."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-atlantic-land-netherlands-surface-ruggedness-std-dev-of-8d08ba92/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)