projection_cs 1.3.0 copy "projection_cs: ^1.3.0" to clipboard
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Published 10 days ago
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A Dart package for coordinate system transformations using the Proj4 library.

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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

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

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Dependencies

cupertino_icons, dart_jts, flutter, geocore, latlong2, proj4dart

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