Universal Coordinate Converter

Web-based tool for converting coordinates between supported systems, with map visualization and TXT/PDF/KML import/export.

Supported Coordinate Systems

• Gauß-Krüger (Bessel, Potsdam) ↔ WGS84 (Germany)
• SWEREF99 18 00 (EPSG:3011) ↔ WGS84 (Sweden)
• WGS84 → Gauß-Krüger (GK) or SWEREF99 18 00 (dropdown) Each direction is available as a separate function/tab.

Features

• All coordinate transformations are performed in-browser using built-in geodetic algorithms.
• WGS84 can be converted to GK or SWEREF99 (dropdown selection).
• TXT file import/export for batch processing.
• KML export for Google Earth.
• PDF export (tables and map).
• Map visualization (OpenLayers, OpenStreetMap tiles; requires internet).
• Google Maps links for each point.
• Dynamic table headers and export filenames.
• Input validation with user feedback.
• Polyfills for legacy browser math functions.

Map and PDF export require internet for external libraries and map tiles.

Mathematical Details

• GK (Bessel) ↔ WGS84: Seven-parameter Helmert transformation
• SWEREF99 18 00 ↔ WGS84: Standard Transverse Mercator projection (GRS80 ellipsoid)
• Polyfills for legacy browser compatibility (Math.cosh, Math.sinh, Math.atanh, Math.asinh)

Usage

1. Open universal-coordinate-converter.html in your browser (no installation needed).
2. Select the desired tab:
   • Gauß-Krüger → WGS84
   • WGS84 → GK or SWEREF99 (dropdown)
   • SWEREF99 18 00 → WGS84
   • Map (visualize/export points)
3. Enter data manually or import TXT file.
4. Select target system if needed.
5. Click Convert and export results as TXT, PDF, or KML.

Input Data Format

Gauß-Krüger and SWEREF99 to WGS84:

PointID Easting Northing Height
1029 3568189.267 5657692.868 321.609
1030 674189.267 6557692.868 421.609

WGS84 to Target System:

PointID Latitude Longitude
1029 51.05031687 9.971396507
1030 55.12345678 18.98765432

Target system (GK or SWEREF99) is selected via dropdown.

System Requirements

• Modern browser (Chrome, Firefox, Edge, Safari)
• JavaScript enabled
• Internet required for map and PDF export
• TXT import up to 5MB

Project Structure

• universal-coordinate-converter.html — main application (all functions in one file)
• Function.txt — mathematical algorithm documentation for coordinate transformations
• README.md — this documentation

Performance

• Most functions work offline (except map and PDF export)
• Handles TXT files up to 5MB
• Uses CDN libraries for map and PDF features

Technical Notes

• UI: Tabs for each conversion direction, dropdown for WGS84 target
• Table headers and export filenames adjust to selected system
• Standard geodetic formulas for all conversions
• Input validation with user feedback
• No installation or server required; runs in browser

License

MIT License

Contributing

Feel free to submit issues or pull requests to improve accuracy or add new systems.

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For questions or suggestions, contact the project author.