# LongitudeOne Spatial Documentation

> LongitudeOne is a standards-oriented ecosystem of spatial libraries for PHP and Doctrine.

The design draws on ISO/IEC 13249-3, ISO 19107, ISO 19111, ISO 19136, OGC Simple Features and RFC 7946.

## Start Here

- [Documentation home](https://www.longitude-one.fr/index.md): Choose a library, reference topic or contributor guide.
- [Spatial concepts](https://www.longitude-one.fr/concepts/index.md): Understand geometries, dimensions, coordinate reference systems and formats.

## Spatial Libraries

- [Spatial Core](https://www.longitude-one.fr/spatial-core/index.md): Explore the geometry domain model and its available versions.
- [Spatial Types](https://www.longitude-one.fr/spatial-types/index.md): Find concrete geometry types, invariants and validation guidance.
- [Doctrine Integration](https://www.longitude-one.fr/doctrine-spatial/index.md): Integrate spatial types and operations with Doctrine.

## Parsing, Encoding and Decoding

- [WKT Parser](https://www.longitude-one.fr/wkt-parser/index.md): Parse textual geometry representations.
- [WKB Parser](https://www.longitude-one.fr/wkb-parser/index.md): Parse binary geometry representations.
- [Spatial Encoder](https://www.longitude-one.fr/spatial-encoder/index.md): Select spatial representation encoding strategies.
- [Spatial Decoder](https://www.longitude-one.fr/spatial-decoder/index.md): Decode spatial representations into geometry values.

## Standards and Reference

- [ISO references](https://www.longitude-one.fr/standards/iso/index.md): Locate the ISO standards governing spatial semantics and reference systems.
- [OGC references](https://www.longitude-one.fr/standards/ogc/index.md): Find the Simple Features baseline.
- [GeoJSON](https://www.longitude-one.fr/standards/rfc/rfc-7946.md): Understand the RFC 7946 representation and its constraints.

## Contributor Documentation

- [Portable publication contract](https://www.longitude-one.fr/shared/portable-markdown-publication-contract.md): Author documentation that remains usable as HTML and portable Markdown.
- [Publication validation](https://www.longitude-one.fr/shared/validating-generated-documentation.md): Run local checks used to prevent invalid documentation publication.

## Full Documentation

- [Complete documentation context](https://www.longitude-one.fr/llms-full.txt): Complete public LongitudeOne Spatial documentation context.