# Department of Interior altitude-datums API

**Canonical:** https://apis.io/apis/doi/doi-altitude-datums-api/  
**Provider:** Department of Interior — https://apis.io/providers/doi/  
**Base URL:** https://developer.nps.gov/api/v1  
**Documentation:** https://www.nps.gov/subjects/developer/index.htm

Department of Interior altitude-datums API is one of 41 APIs that [Department of Interior](https://apis.io/providers/doi/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include altitude-datums. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

The recommended vertical datum is NAVD88 (North American Vertical Datum of 1988) where applicable as stated in Office of Information Technical Memo 2002.01. NGVD29 (National Geodetic Vertical Datum of 1929) and NAVD88 are the only datums that can be converted on output. NWIS uses the North American Vertical Datum Conversions (VERTCON) of the National Geodetic Survey to convert from NGVD29 to NAVD88 or vice versa. Conversions to or from other vertical datums are not available.

## Machine-readable artifacts (3)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/doi/refs/heads/main/openapi/doi-altitude-datums-api-openapi.yml
- **Documentation** — https://api.waterdata.usgs.gov/docs/
- **Migration** — https://api.waterdata.usgs.gov/docs/ogcapi/migration/

## Other Department of Interior APIs (12)

- [NPS Data API](https://apis.io/apis/doi/nps-data-api/)
- [USGS Earthquake Hazards Web Services](https://apis.io/apis/doi/usgs-earthquake-hazards-web-services/)
- [USGS Mineral Resources Data API](https://apis.io/apis/doi/usgs-mineral-resources-data-api/)
- [BLM GIS REST Services](https://apis.io/apis/doi/blm-gis-rest-services/)
- [USGS ScienceBase API](https://apis.io/apis/doi/usgs-sciencebase-api/)
- [Department of Interior agency-codes API](https://apis.io/apis/doi/doi-agency-codes-api/)
- [Department of Interior aquifer-codes API](https://apis.io/apis/doi/doi-aquifer-codes-api/)
- [Department of Interior aquifer-types API](https://apis.io/apis/doi/doi-aquifer-types-api/)
- [Department of Interior channel-measurements API](https://apis.io/apis/doi/doi-channel-measurements-api/)
- [Department of Interior citations API](https://apis.io/apis/doi/doi-citations-api/)
- [Department of Interior combined-metadata API](https://apis.io/apis/doi/doi-combined-metadata-api/)
- [Department of Interior continuous API](https://apis.io/apis/doi/doi-continuous-api/)

## Tags

altitude-datums

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/doi/doi-altitude-datums-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/doi/.