# HALOWERK Southern Land – Greece Terrain Ruggedness (Elevation Std Dev)

> HALOWERK Southern Land – Greece Terrain Ruggedness (Elevation Std Dev) is a paid API for AI agents from suedland.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 for a given coordinate within Greece, quantifying terrain ruggedness.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-southern-land-greece-terrain-ruggedness-elevation-std-dev-8b8b9a1c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AgCFfmbsgeWCvitPIFSjJ

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-southern-land-greece-terrain-ruggedness-elevation-std-dev-8b8b9a1c -d '<json body>'
```

Example prompt: What's the terrain ruggedness at latitude 37.97 and longitude 23.73 in Greece — give me the standard deviation of surface elevations for that point.

## When to prefer this

Choose this endpoint when you need a quantitative terrain ruggedness metric specifically for a point location within Greece, particularly for applications like agricultural suitability, infrastructure planning, environmental assessment, or outdoor activity planning. It is part of a suite of Greece-specific land analysis endpoints from HALOWERK Southern Land, making it ideal when combining ruggedness data with other land metrics like soil type, land cover, or slope gradient for the same region.

## Known failure modes

- Coordinate outside Greece boundary (validated against Natural Earth boundary) — request rejected before payment
- Latitude or longitude outside published European coverage range — schema validation error
- Invalid or missing coordinate values — input validation failure
- Service unavailability — HTTP 5xx error

## How this service works

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

## Output

A numeric value representing the standard deviation of sampled surface elevations at the specified coordinate within Greece, indicating how rugged or variable the terrain is — higher values mean more uneven topography.

## 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-southern-land-greece-terrain-ruggedness-elevation-std-dev-8b8b9a1c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)