# HALOWERK Central Land – Surface Ruggedness (Slovenia)

> HALOWERK Central Land – Surface Ruggedness (Slovenia) is a paid API for AI agents from mitteleuropa.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 as a terrain ruggedness index for a given WGS84 coordinate within Slovenia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/si-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-central-land-surface-ruggedness-slovenia-b6d9b477
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1qSzT9kUFvh3hSoXerCQ0

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-central-land-surface-ruggedness-slovenia-b6d9b477 -d '<json body>'
```

Example prompt: What is the terrain ruggedness at latitude 46.15, longitude 14.52 in Slovenia — give me the standard deviation of surface elevations for that spot.

## When to prefer this

Choose this endpoint when you need a quantitative ruggedness or terrain roughness metric specifically for locations in Slovenia, based on Copernicus DEM GLO-30 data. It is ideal for land suitability analysis, ecological modeling, infrastructure planning, or any application requiring a standardized elevation variability measure rather than raw elevation or slope. Prefer it over generic elevation APIs when the standard deviation of elevations (ruggedness) rather than mean elevation or gradient is the desired metric, and when your location is confirmed to be within Slovenia.

## Known failure modes

- Coordinate outside Slovenia boundary returns a validation error before any computation
- Latitude or longitude outside the allowed European range (34–72.5°N, -31.5–40.5°E) causes rejection
- Invalid or missing coordinate fields return a schema validation error
- Payment failure via x402 protocol prevents the call from completing
- Network timeout for edge locations or slow DEM tile retrieval

## How this service works

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

## Output

A numeric value representing the standard deviation of sampled surface elevations within the analysis neighborhood around the given coordinate, indicating terrain ruggedness. Higher values mean more irregular, rough terrain; lower values indicate flatter surfaces. Coordinates outside Slovenia's Natural Earth boundary are rejected before processing.

## 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-central-land-surface-ruggedness-slovenia-b6d9b477/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)