# opentopodata.elevation.ocean

Get ocean floor depth (metres, negative values below sea level) at a lat/lon coordinate using the GEBCO 2020 global bathymetric dataset (450m resolution). Returns depth in metres; negative values indicate depth below sea level, positive values indicate land elevation above sea level. Use for marine navigation planning, submarine cable routing, oceanographic research, and coastal engineering. MIT licence, no auth, no upstream cost.

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

## Facts

- Tool: `opentopodata.elevation.ocean`
- 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 ocean/sea point (-90 to 90) |
| `lon` | number | yes | Longitude of the ocean/sea point (-180 to 180) |
| `interpolation` | string | no | Interpolation method: bilinear (default) or nearest |

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": "opentopodata.elevation.ocean",
    "arguments": {
      "lat": 0,
      "lon": 0
    }
  }
}
```

## Why opentopodata.elevation.ocean is rated Low

Retrieves bathymetric data with no side effects, write operations, or resource-moving capabilities.

From the tool's own definition: "Get ocean floor depth at lat/lon coordinate from GEBCO 2020 dataset"

## Use case

AI agents call opentopodata.elevation.ocean 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": {
    "opentopodata.elevation.ocean": {}
  }
}
```

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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