dart_crs

This package extends proj4dart by embedding the EPSG Geodetic Parameter Dataset maintained by the Geodesy Subcommittee of the IOGP Geomatics Committee. epsg.org.

Features

• Retrieve the WKT for an EPSG coordinate reference system definition.
• Transform coordinates between two EPSG coordinate reference systems
• Create a named proj4dart Projection using any of the EPSG defined codes.

Getting started

To use this plugin, add dart_crs as a dependency in your pubspec.yaml file. For example:

dependencies:
  dart_crs: '^1.0.2'

Usage

Create a coordinate reference system:

CoordinateReferenceSystem crsLatLong = await CRSFactory.createCRS('EPSG:4326');

Transform a point between two coordinate reference systems.

CoordinateTransform transform = 
    await CRSFactory.createCoordinateTransformFromCodes('EPSG:4326','EPSG:3183');
Point geoPoint = Point(-45.2395,60.1425);
Point? gr96Point = transform!.transform(geoPoint);
Point? inversePoint = transform!.inverse(gr96Point!);

Extract a WKT definition:

String wkt1 = await WKTReader().fetchWkt('EPSG:4326');

Additional information

Credit to Geomatic Solutions for maintaining the EPSG dataset. The EPSG dataset version for this release is v11.001. The EPSG dataset is based on the ISO 19111:2019 international standard for referencing by coordinates, sometimes referred to as WKT2. Before embedding into this library, the data are converted to the ISO 19111:2007 international standard for enhanced compatibility with proj4dart.