National Geospatial-Intelligence Agency

The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the U.S. Department of Defense that provides geospatial intelligence in support of national security. Through its Office of Geomatics, NGA publishes the Earth-Info portal, which exposes a REST API in OpenAPI format for downloading GPS ephemeris products, Earth Orientation Parameter Predictions (EOPP), Navdata clock state files, and short-term orbit prediction products. NGA also maintains the WGS 84 reference frame, EGM2008 gravitational model, and the GEOTRANS coordinate conversion tool.

National Geospatial-Intelligence Agency publishes 4 APIs on the APIs.io network, including Clock API, EOPP API, Ephemeris API, and 1 more. Tagged areas include Federal-Government, Geospatial, Intelligence, Defense, and Geomatics.

National Geospatial-Intelligence Agency’s developer surface includes developer portal and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

22.5/100 emerging ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs

Federal-Government Geospatial Intelligence DefenseGeomatics

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 22.5/100 · emerging

Contract Quality 10.3 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 5.8 / 9

Regulatory Posture 1.7 / 15

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/national-geospatial-intelligence-agency: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 4

Individual APIs this provider publishes, each with its own machine-readable definition.

National Geospatial-Intelligence Agency Clock API

Navdata clock state files.

National Geospatial-Intelligence Agency EOPP API

Earth Orientation Parameter Predictions in multiple formats.

National Geospatial-Intelligence Agency Ephemeris API

GPS ephemeris products, including Center of Mass and Antenna Phase Center variants.

National Geospatial-Intelligence Agency Orbit API

Short-term orbit prediction products.

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

NGA Earth-Info REST Clock API

OPEN COLLECTION

NGA Earth-Info REST Clock EOPP API

OPEN COLLECTION

NGA Earth-Info REST Clock Ephemeris API

OPEN COLLECTION

NGA Earth-Info REST Clock Orbit API

OPEN COLLECTION

NGA Earth-Info REST API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

National Geospatial Intelligence Agency Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

National Geospatial Intelligence Agency Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

National Geospatial Intelligence Agency Finops

FINOPS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

National Geospatial Intelligence Agency Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

National Geospatial Intelligence Agency Agentic Access

6 operations

6 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Contact

Contact

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

Tearline

Tearline

Source (apis.yml)

aid: national-geospatial-intelligence-agency
name: National Geospatial-Intelligence Agency
description: The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the U.S. Department of Defense
  that provides geospatial intelligence in support of national security. Through its Office of Geomatics, NGA publishes the
  Earth-Info portal, which exposes a REST API in OpenAPI format for downloading GPS ephemeris products, Earth Orientation
  Parameter Predictions (EOPP), Navdata clock state files, and short-term orbit prediction products. NGA also maintains the
  WGS 84 reference frame, EGM2008 gravitational model, and the GEOTRANS coordinate conversion tool.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/national-geospatial-intelligence-agency.png
url: https://raw.githubusercontent.com/api-evangelist/national-geospatial-intelligence-agency/refs/heads/main/apis.yml
created: '2024-12-25'
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Federal-Government
- Geospatial
- Intelligence
- Defense
- Geomatics
tags_raw:
- Federal Government
- Geospatial
- Intelligence
- Defense
- Geomatics
apis:
- aid: national-geospatial-intelligence-agency:national-geospatial-intelligence-agency-clock-api
  name: National Geospatial-Intelligence Agency Clock API
  description: Navdata clock state files.
  humanURL: https://earth-info.nga.mil/
  baseURL: https://earth-info.nga.mil/
  tags:
  - Clock
  properties:
  - type: OpenAPI
    url: openapi/national-geospatial-intelligence-agency-clock-api-openapi.yml
  - type: Documentation
    url: https://earth-info.nga.mil/
  - type: Portal
    url: https://earth-info.nga.mil/
- aid: national-geospatial-intelligence-agency:national-geospatial-intelligence-agency-eopp-api
  name: National Geospatial-Intelligence Agency EOPP API
  description: Earth Orientation Parameter Predictions in multiple formats.
  humanURL: https://earth-info.nga.mil/
  baseURL: https://earth-info.nga.mil/
  tags:
  - EOPP
  properties:
  - type: OpenAPI
    url: openapi/national-geospatial-intelligence-agency-eopp-api-openapi.yml
  - type: Documentation
    url: https://earth-info.nga.mil/
  - type: Portal
    url: https://earth-info.nga.mil/
- aid: national-geospatial-intelligence-agency:national-geospatial-intelligence-agency-ephemeris-api
  name: National Geospatial-Intelligence Agency Ephemeris API
  description: GPS ephemeris products, including Center of Mass and Antenna Phase Center variants.
  humanURL: https://earth-info.nga.mil/
  baseURL: https://earth-info.nga.mil/
  tags:
  - Ephemeris
  properties:
  - type: OpenAPI
    url: openapi/national-geospatial-intelligence-agency-ephemeris-api-openapi.yml
  - type: Documentation
    url: https://earth-info.nga.mil/
  - type: Portal
    url: https://earth-info.nga.mil/
- aid: national-geospatial-intelligence-agency:national-geospatial-intelligence-agency-orbit-api
  name: National Geospatial-Intelligence Agency Orbit API
  description: Short-term orbit prediction products.
  humanURL: https://earth-info.nga.mil/
  baseURL: https://earth-info.nga.mil/
  tags:
  - Orbit
  properties:
  - type: OpenAPI
    url: openapi/national-geospatial-intelligence-agency-orbit-api-openapi.yml
  - type: Documentation
    url: https://earth-info.nga.mil/
  - type: Portal
    url: https://earth-info.nga.mil/
common:
- type: AgenticAccess
  url: agentic-access/national-geospatial-intelligence-agency-agentic-access.yml
- type: DomainSecurity
  url: security/national-geospatial-intelligence-agency-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/ngageoint
- type: LinkedIn
  url: https://www.linkedin.com/company/nga
- type: Website
  url: https://www.nga.mil/
- type: Portal
  url: https://earth-info.nga.mil/
- type: Tearline
  url: https://www.tearline.mil/
- type: Contact
  url: mailto:geomatics@nga.mil
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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