Changelog

5.0.0 - March 4, 2026

Switch to auto-generated FFI bindings via ruby-bindgen
Add support for PROJ 9.4 API proj_crs_has_point_motion_operation
Add support for PROJ 9.5 APIs: proj_context_set_user_writable_directory, proj_coordoperation_requires_per_coordinate_input_time, and proj_create_conversion_local_orthographic
Add support for PROJ 9.6 APIs: proj_trans_bounds_3D
Add support for PROJ 9.7 APIs: proj_geod_direct
Add 3D bounds support (Bounds3d + transform_bounds_3d) for PROJ 9.6 proj_trans_bounds_3D
Fix manual wrapper argument order for proj_create_conversion_lambert_conic_conformal_1sp_variant_b (9.4)
Fix Parameter#to_description passing parameter name instead of unit name
Fix pointer lifetime issues in Parameters#types=, PjAxisDescription, and PjParamDescription
Fix GC lifetime bugs: option string pointers, CoordinateSystem.create axis descriptions, and missing require 'uri'
Fix context/state lifetime issues in OperationFactoryContext and Context#set_log_function
Expand regression tests for lifecycle safety and new PROJ 9.4/9.5/9.6 wrappers
Unit.built_in now returns all unit types (91 units) instead of only linear units (24 units)
Internal: struct and enum types use Ruby naming conventions (e.g., PjCoord instead of PJ_COORD)
Remove deprecated Context#database_path and Context#database_path= (use context.database.path instead)
Internal: method names use Ruby naming conventions (e.g., proj_create_ellipsoidal_2d_cs instead of proj_create_ellipsoidal_2D_cs)

Support Proj 9
Add support for missing APIs - the gem now provides almost 100% coverage
Add support for Proj experimental APIs including the creation of projection conversions
Add/updated support for a number of ISO 19111 classes, including PrimeMeridian, Ellipsoid, Datum, DatumEnsemble, CoordinateOperation and Parameters
Greatly improved documentation (https://rubydoc.info/github/cfis/proj4rb)
Remove old Proj 4.9 support
Note this release does have some API changes. These include the removal of Proj 4.9 Point and Coordinate classes, changes to the PrimeMeridian class and changes to the Ellipsoid class. These changes should not impact most users.

Support Proj 8 which removes the old Proj API (Charlie Savage)
Support newer versions of FFI which remove support for returning strings from callbacks (Charlie Savage)

Set Ruby 2.4.1 to be the minimum allowed version (Samuel Williams)
Fix incorrect use of context, reduce warnings when running tests (Samuel Williams)
Fix bundle exec rake test (Samuel Williams)
Add 2.4.1 to the travis test matrix (Samuel Williams)

Full rewrite to support API changes in Proj versions 5 and 6 (Charlie Savage)
As part of rewrite switch bindings to use FFI versus a C extension (Charlie Savage)
Split Ruby code into multiple files based on classes (Charlie Savage)
Add in a bunch of new classes including Context, Crs, Coordinate, Ellipsoid, Prime Meridian and Transform (Charlie Savage)
Deprecate Projection and Point - these will stop working with Proj 7 since they use an older deprecated API (Charlie Savage)

Update to compile on Ruby 1.9.* (Fabio Renzo Panettieri)
Add in gemspec file (Charlie Savage)
Add rake-compiler as development dependency, remove older MinGW build system (Charlie Savage)
Move to GitHub (Charlie Savage)

Update extconf.conf file to be more flexible to make it easier to build on OS X when using MacPorts
Updated windows binary to link against proj4.7