# Land Survey Screening – Ground Elevation Lookup

> Land Survey Screening – Ground Elevation Lookup is a paid API for AI agents from land-survey.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Returns ground elevation in feet and meters at a US latitude/longitude coordinate using USGS 3DEP data, with a data-coverage check.

## Facts

- Endpoint: GET https://land-survey.x402tookit.com/elevation?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/land-survey-screening-ground-elevation-lookup-508a7327
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TUaa5EH0knyxcJ6sdQVTY

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 land-survey-screening-ground-elevation-lookup-508a7327
```

Example prompt: What's the ground elevation at latitude 39.7392, longitude -104.9903? I need the answer in both feet and meters from USGS data.

## When to prefer this

Choose this endpoint when you need USGS-authoritative ground elevation at a specific US point, especially when you also need to know whether 3DEP coverage is available and reliable at that location. It is ideal for site-screening workflows, pre-construction assessment, flood risk analysis, or any geospatial pipeline that requires certified elevation in both feet and meters. Prefer this over generic geocoding elevation estimates when regulatory-grade or survey-grade sourcing matters.

## Known failure modes

- Coordinates outside the US or US territories — USGS 3DEP only covers US points, resulting in a null elevation and a coverage failure verdict
- Invalid lat/lon values outside valid ranges cause a 400-class error
- Degraded data flag returned when 3DEP coverage exists but resolution is lower than optimal
- Network or upstream USGS service outage causing a 500-level error or timeout
- Missing required query parameters (lat or lon) returns a validation error

## How this service works

Ground elevation in feet and meters at a US latitude and longitude from USGS 3DEP, with data-coverage check.

## Output

Returns a JSON object containing the input lat/lon, elevation in feet and meters, the USGS data source URL, a coverage verdict (e.g. available/degraded/not available), a human-readable summary, reasons for any degraded or missing coverage, a list of unchecked items, a timestamp (asOf), and a disclaimer about data accuracy.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "lat",
      "lon"
     ],
     "properties": {
      "lat": {
       "type": "number",
       "description": "Latitude, e.g. 39.7392"
      },
      "lon": {
       "type": "number",
       "description": "Longitude, e.g. -104.9903"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "lat": {
       "type": [
        "null",
        "number"
       ]
      },
      "lon": {
       "type": [
        "null",
        "number"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "elevationFeet": {
       "type": [
        "null",
        "number"
       ]
      },
      "elevationMeters": {
       "type": [
        "null",
        "number"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/land-survey-screening-ground-elevation-lookup-508a7327/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from land-survey.x402tookit.com](https://www.zero.xyz/host/land-survey.x402tookit.com/llms.txt)