sweref99-nu

PWA for showing current position in SWEREF 99 TM. Works offline after first visit.

Features

• Shows GPS coordinates in SWEREF 99 TM format
• Works offline with ServiceWorker caching
• Compensates for ITRF/ETRS89 continental drift

Documentation

• SWEREF 99 Definition Verification - Complete verification of coordinate system definition with traceable references
• Software Bill of Materials - Direct runtime, build, and test dependencies with license references
• Test Suite Documentation - Overview of the current Jest-based unit test coverage

References

• https://developer.mozilla.org/en-US/docs/Web/API/Geolocation_API
• https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API
• https://picocss.com/docs
• https://github.com/proj4js/proj4js
• https://epsg.io/3006 - SWEREF 99 TM official specification