Yes, there is comprehensive implementation documentation available for OpenLR. Here are some key resources:

GitHub Repository

The OpenLR GitHub repository contains the reference implementation of OpenLR. It includes modules for encoding and decoding OpenLR locations, as well as tools for map access and data handling [1].

HOWTO.md

The HOWTO.md file in the GitHub repository provides detailed instructions on how to encode and decode OpenLR locations on digital maps [2].

INRIX Documentation

INRIX offers documentation on Dynamic Location Referencing, which includes information on OpenLR. This resource provides insights into the implementation tools available, such as the Java-based encoder/decoder and map access layer [3].

These resources should help you get started with implementing OpenLR in your projects.

References
[1] GitHub - tomtom-international/openlr: Reference implementation of ...
[2] openlr/HOWTO.md at master · tomtom-international/openlr - GitHub
[3] Dynamic Location Referencing - INRIX documentation

1. Official OpenLR Documentation (by TomTom)

📄 OpenLR White Paper (Core Specification)

• The foundational document that explains:

  • The encoding/decoding process

  • Location reference types

  • Binary and XML formats

  • Algorithms for location matching

📍 Link: https://www.openlr.org/docs/OpenLR-whitepaper.pdf

✅ 2. OpenLR Reference Implementation (Java Library)

📦 Official GitHub Repository

• TomTom’s open-source Java implementation of OpenLR

• Includes:

  • Encoding/decoding tools

  • Sample map and test data

  • CLI tools

• Great for understanding the logic and getting started with your own integration

📍 GitHub: https://github.com/TomTom/openlr

✅ 3. OpenLR Encoder/Decoder Flow Diagrams

• The whitepaper and GitHub repo include helpful flow diagrams and pseudo-code for:

  • Finding candidate locations

  • Generating location references

  • Decoding them onto different maps

This helps if you're implementing OpenLR in a language other than Java (e.g., C++, Python, JavaScript).

✅ 4. Community/Examples

• While OpenLR isn't widely discussed in public forums, you can find:

  • Example implementations or forks on GitHub (search "OpenLR").

  • Occasional integration notes in projects using OpenStreetMap or routing engines like GraphHopper or OSRM.

❗Note: No "Plug-and-Play" Web API

• OpenLR is a specification and library, not a hosted API or web service.

• You typically:

  • Integrate the encoder on your side (to generate references).

  • Transmit the encoded data (binary or base64).

  • Use the decoder on the recipient side to map-match to their own map data.

Bonus: Alternatives and Extensions

If your use case goes beyond what the core OpenLR offers, you might consider:

• OpenLR+ (an extended version used internally by some companies)

• Custom adaptations for area locations, GeoCoordinate encoding, etc.