# HALOWERK Central Land – Slovakia Terrain Ruggedness (Standard Deviation of Elevation)

> HALOWERK Central Land – Slovakia Terrain Ruggedness (Standard Deviation of Elevation) is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the standard deviation of sampled surface elevations within a neighborhood around a given coordinate in Slovakia, quantifying terrain ruggedness.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-ruggedness
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-slovakia-terrain-ruggedness-standard-deviation-7f43897c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mihZtZbi3IGgvE7J0tNwu

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-slovakia-terrain-ruggedness-standard-deviation-7f43897c -d '<json body>'
```

Example prompt: What's the terrain ruggedness at latitude 48.9 and longitude 19.4 in Slovakia? I need the standard deviation of surface elevations around that point.

## When to prefer this

Choose this endpoint when you need a quantitative measure of terrain roughness or variability specifically within Slovakia, based on Copernicus DEM GLO-30 elevation data. It is ideal for applications requiring ruggedness indices such as agricultural suitability, infrastructure planning, ecological modeling, or trail characterization. Prefer it over mean elevation endpoints when elevation variability—not absolute height—is what matters.

## Known failure modes

- Coordinate outside Slovakia's Natural Earth boundary returns a rejection error before computation
- Latitude or longitude outside allowed European coverage range (34–72.5°N, -31.5–40.5°E) returns a validation error
- Payment failure via x402 protocol results in no data returned
- Missing latitude or longitude fields cause a request validation error

## How this service works

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

## Output

A numeric value representing the standard deviation of sampled surface elevations within a neighborhood around the requested coordinate in Slovakia. Higher values indicate more rugged, uneven terrain; lower values indicate flatter terrain. The coordinate is validated against Slovakia's Natural Earth boundary 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-slovakia-terrain-ruggedness-standard-deviation-7f43897c/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)