# opentopo.elevation.point

Query terrain elevation (in metres) at a specific latitude/longitude coordinate using global Digital Elevation Model (DEM) datasets. Supports SRTMGL1 (NASA SRTM 30m, default), COP30 (Copernicus 30m), AW3D30 (ALOS 30m), NASADEM (30m reprocessed), SRTM15Plus (500m global bathymetry), and more. Returns elevation_m plus dataset resolution info. Source: OpenTopography / USGS 3DEP, CC BY 4.0, free registration (5K req/day).

Agent View of the PolicyLayer registry record for `opentopo.elevation.point`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/opentopo.elevation.point

## Facts

- Tool: `opentopo.elevation.point`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 3 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `lat` | number | yes | Latitude of the point to query (-90 to 90 decimal degrees) |
| `lon` | number | yes | Longitude of the point to query (-180 to 180 decimal degrees) |
| `dataset` | string | no | Global DEM dataset to query. SRTMGL1 = NASA SRTM 30m (default, global). COP30 = Copernicus 30m (high accuracy). AW3D30 = ALOS World 3D 30m. NASADEM = NASA 30m r |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "opentopo.elevation.point",
    "arguments": {
      "lat": 0,
      "lon": 0
    }
  }
}
```

## Why opentopo.elevation.point is rated Low

Tool retrieves publicly available geospatial elevation data without modifying state or executing arbitrary code.

From the tool's own definition: "Query terrain elevation at specific latitude/longitude coordinate, returns elevation data."

## Use case

AI agents call opentopo.elevation.point to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "opentopo.elevation.point": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase