projection_cs 1.3.0

A Dart package for coordinate system transformations using the Proj4 library.

1.3.0

• EXPANDED PROJECTION SUPPORT: Added comprehensive Turkish coordinate system support
  • Added EPSG projection codes for Turkish ED50 coordinate systems:
    • EPSG:2302 - 3Der ED50 DOM30 (3-degree Transverse Mercator zone)
    • EPSG:2319 - 3Der ED50 DOM27 (3-degree Transverse Mercator zone)
    • EPSG:2321 - 3Der ED50 DOM33 (3-degree Transverse Mercator zone)
    • EPSG:2322 - 3Der ED50 DOM36 (3-degree Transverse Mercator zone)
    • EPSG:2323 - 3Der ED50 DOM39 (3-degree Transverse Mercator zone)
    • EPSG:2324 - 3Der ED50 DOM42 (3-degree Transverse Mercator zone)
    • EPSG:2325 - 3Der ED50 DOM45 (3-degree Transverse Mercator zone)
  • Added EPSG UTM projection codes for Turkish ED50 systems:
    • EPSG:32635 - 6Der ED50 DOM27 (UTM Zone 35)
    • EPSG:32636 - 6Der ED50 DOM33 (UTM Zone 36)
    • EPSG:32637 - 6Der ED50 DOM39 (UTM Zone 37)
    • EPSG:32638 - 6Der ED50 DOM45 (UTM Zone 38)
  • Added additional SR-ORG projection codes for Turkish ITRF96 UTM systems:
    • SR-ORG:7869 - 6Der ITRF DOM27 (UTM Zone 35)
    • SR-ORG:7870 - 6Der ITRF DOM33 (UTM Zone 36)
    • SR-ORG:7871 - 6Der ITRF DOM39 (UTM Zone 37)
    • SR-ORG:7872 - 6Der ITRF DOM45 (UTM Zone 38)
  • Updated ProjectionConverter to handle all new projection codes with proper coordinate order
  • Enhanced Turkish geodetic infrastructure support with accurate datum transformation parameters
  • All new projections fully integrated into conversion methods and coordinate handling logic

1.2.1

• LOCALE INDEPENDENCE: Enhanced WKT generation with locale-independent formatting
  • Modified WktGenerator to use locale-independent WKTWriter configuration
  • Disabled formatting and tab settings to ensure consistent output regardless of system locale
  • Prevents decimal separator and number formatting issues across different regional settings
  • Ensures reliable WKT output format in international environments
  • Added _createLocaleIndependentWriter() method for proper WKT writer initialization

1.2.0

• CODE REORGANIZATION: Improved project structure and maintainability
  • Reorganized lib/src/ directory with better separation of concerns
  • Created specialized folders for different functionalities:
    • projections/ - Coordinate projection conversion logic (ProjectionConverter, ProjectionDefinitions)
    • generators/ - WKT geometry generation and spatial operations (WktGenerator)
    • parsers/ - WKT parsing functionality (UniversalWKTParser)
    • model/ - Data models and geometry objects (unchanged)
    • utils/ - Utility functions and exceptions (unchanged)
  • Updated import paths throughout the codebase to reflect new structure
  • All existing functionality remains unchanged - only internal organization improved
  • Enhanced code maintainability and developer experience
  • Verified all tests pass after reorganization

1.1.0

• Added WKTParser

1.0.5

• OPTIMIZATION: Improved performance for same-projection transformations
  • Added early return optimization when source and target projections are identical
  • Applied to both convert() and convertBatch() methods
  • Eliminates unnecessary computation for same-projection scenarios
• FEATURE: Added WKT projection conversion functionality
  • Added convertWkt() method to transform WKT geometries between coordinate systems
  • Supports all standard WKT geometry types (Point, LineString, Polygon, Multi-geometries, GeometryCollection)
  • Comprehensive error handling and validation for WKT parsing and transformation
  • Enhanced spatial workflow by enabling direct WKT coordinate system transformations

1.0.3

• ENHANCEMENT: Enhanced WKT to Geometry conversion with projection support
  • Updated wktToGeometry() method to accept optional sourceProjectionKey parameter
  • Added automatic coordinate conversion from source projection to EPSG:4326 (WGS84)
  • Added comprehensive projection conversion support for all geometry types (Point, LineString, Polygon, Multi-geometries, GeometryCollection)
  • Enhanced spatial analysis workflow by providing direct geometry objects in standardized WGS84 coordinates
  • Improved documentation with detailed examples for projection conversion use cases
  • Added extensive test coverage for projection conversion scenarios

1.0.2

• FEATURE: Added WKT to Geometry conversion methods
  • Added wktToGeometry() method to convert WKT strings to dart_jts Geometry objects
  • Added geometryToWkt() method to convert Geometry objects back to WKT strings
  • Enhanced spatial analysis capabilities by providing direct access to Geometry objects
  • Comprehensive error handling and documentation for new conversion methods
  • Enables advanced spatial operations using dart_jts library directly

1.0.1

• BUGFIX: Fixed coordinate order issue in EPSG:3857 to EPSG:4326 conversions
  • Improved coordinate input format handling for Web Mercator (EPSG:3857)
  • Added comprehensive documentation for coordinate order expectations
  • Enhanced _createSourcePoint method to handle projected coordinate systems correctly
  • Fixed polygon coordinate misalignment that caused Turkey boundaries to appear in wrong locations
  • Added detailed coordinate order validation for EPSG:3857 inputs

1.0.0

• Initial Release - Complete coordinate projection and spatial analysis package for Dart/Flutter
• ProjectionConverter: PROJ4-based coordinate system transformations
  • Single point conversion with convert() method
  • Batch conversion with convertBatch() method
  • Support for Turkish national coordinate systems (ITRF96, ED50)
  • Support for global coordinate systems (WGS84, UTM, Web Mercator)
• WktGenerator: Comprehensive spatial operations using dart_jts
  • Geometry creation (Point, LineString, Polygon, Multi-geometries)
  • Spatial analysis (buffer, convex hull, centroid, envelope)
  • Overlay operations (union, intersection, difference, symmetric difference)
  • Spatial predicates (intersects, contains, touches, within, covers, etc.)
  • Measurements (area, length, distance calculations)
  • Geometry validation and simplification
  • WKT (Well-Known Text) output generation
• ProjectionDefinitions: Pre-configured projection definitions
  • Turkish National Coordinate Systems (ITRF96 3-degree zones)
  • European Datum 1950 (ED50) systems
  • UTM 6-degree zone systems
  • Spatial Reference Organization (SR-ORG) definitions
  • Global coordinate systems (EPSG standards)
• Code Organization: MARK comments for improved navigation and maintainability
• Dependencies: dart_jts ^0.3.0+1, proj4dart ^2.1.0, latlong2: ^0.9.1
• Platform Support: Flutter and Dart applications