---
title: ISO standards
description: Introduces the ISO spatial standards included in the LongitudeOne reference scope.
canonical_html: ./index.html
canonical_markdown: ./index.md
---

[View HTML version](./index.html)

This section introduces the ISO standards in LongitudeOne's spatial reference scope:

- [ISO/IEC 13249-3 — SQL/MM Spatial](iso-iec-13249-3.md);
- [ISO 19107:2019 — Spatial schema (OGC 19-092)](iso-19107.md);
- [ISO 19111 — Referencing by coordinates](iso-19111.md);
- [ISO 19136 — Geography Markup Language](iso-19136.md).

The references identify the assessed editions, requirements and
LongitudeOne support, limitations and extensions. Inclusion here does not imply
support or conformance.

See the [reference architecture](../../shared/spatial-reference-documentation-architecture.md#standards-reference) for authoring rules.