s2 1.1.11

• Fix deprecated Abseil usage and Rcpp include order #300 #297 #299

s2 1.1.9

• Implement serialization support for s2_geography vectors. This not only allows data containing s2 geography to be safely saved and restored across R sessions, but also enables using s2 in parallel algorithms such as mclapply() (#283)
• Fix code to help gcc-ubsan understand the region coverer (#275)
• Inspect S2_FORCE_BUNDLED_ABSEIL in conifigure: if non-empty, any system install of Abseil is ignored (e.g., if using a non-standard compiler on a system where system Abseil is available via pkg-config) (#275)
• Disable optimization in compact_array.h that confused compilers when compiling with -Wpedantic (#275).
• Add cmake to SystemReqirements. Even though this is technically optional (system Abseil can be used), adding to requirements helps some installers automatically install the dependency (#277).

s2 1.1.8

• s2_buffer_cells() recycles max_dist and min_level arguments, allowing to specify these by feature (#264 and https://github.com/r-spatial/sf/issues/2488).
• The internal version of s2geometry is now 0.11.1 (#257, #263).
• The Abseil dependency is resolved using pkg-config where possible. Where this is not possible, a vendored version of Abseil will be built using CMake (#258).

s2 1.1.7

s2 1.1.6

• Fix CRAN warning (#254).

s2 1.1.5

• fix compiler problem on Alpine 3.19.0 (#251)

s2 1.1.4

• Updated more tests to pass on a forthcoming waldo package update (#237).

s2 1.1.3

• Made a test less strict to pass tests on Alpine Linux (#218, #220).
• Updated tests to pass on forthcoming waldo package update (@hadley, #226).
• Updated vendored file modifications to suppress a multi-line comment warning on gcc (#214, #227).

s2 1.1.2

• Fixed test for as.data.frame() for s2_cell() to comply with new wk version and the latest release of R (#207).
• Fix unary union of an empty multipolygon (#208).
• Added #include <cstdint> to an Abseil header to fix compilation with gcc13 (#209, #210).
• Update internal Abseil to 20220623.1 LTS (#213).

s2 1.1.1

• Fix new CRAN check warnings (#202, #203).

s2 1.1.0

• Fix for s2 build on Windows with R <= 3.6.x (#142)
• Fix for s2 build on MacOS with multiple openssl versions (#142, #145, #146)
• Fix for s2 build on 32-bit openssl (#143, #147)
• Added s2_convex_hull() and s2_convex_hull_agg() (@spiry34, #150, #151, #163).
• Added max_distance argument to s2_closest_edges(), making distance-constrained k-nearest neighbours possible (#125, #156, #162).
• Added a spherical s2_point_on_surface() implementation for polygons (@kylebutts, #152, #161)
• Added a s2_cell_union() vector class to represent cell coverings and operators to generate them from an s2 geography vector (e.g., s2_covering_cell_ids()). Cell unions are useful as compact representations of spherical geometry and can be used like a bounding box to determine a possible intersection with one or more geographies (#85, #94, #164).
• Refactored the simple features compatability layer into a standalone code base for potential future use in a Python adaptation (#165).
• Migrate input and output to non-deprecated wk package handlers and writers (#101, #165, #168).
• Make s2_union_agg() more efficient using a recursive merge strategy (#103, #165).
• Fix package build on Raspberry Pi (#169, #171).
• Fix warning on clang14 when compiling with -O0 (#167, #172).
• Added s2_prepared_dwithin() and fixed s2_dwithin_matrix() such that it efficiently uses the index (#157, #174).
• Updated s2_lnglat() and s2_point() to use wk::xy() (a record-style vctr) to represent point coordinates. This is much faster than the previous representation which relied on list() of external pointers (#181, #159).
• Added arguments planar and tessellate_tol_m to s2_as_text(), s2_as_binary(). Use planar = TRUE and set tessellate_tol_m to the maximum error for your use-case to automatically subdivide edges to preserve or “straight” lines in Plate carree projection on import (#182).
• Added arguments planar and tessellate_tol_m to s2_geog_from_text(), and s2_geog_from_wkb(). Use planar = TRUE and set tessellate_tol_m to the maximum error for your use-case to automatically subdivide edges to ensure or “straight” lines in Plate carree projection on export (#182).

s2 1.0.7

• Update the internal copy of s2geometry to use updated Abseil, fixing a compiler warning on gcc-11 (#79, #134).

s2 1.0.6

• Added support for STRICT_R_HEADERS (@eddelbuettel, #118).
• Fixed a bug where the result of s2_centroid_agg() did not behave like a normal point in distance calculations (#119, #121).
• Fixed a Windows UCRT check failure and updated openssl linking (@jeroen, #122).

s2 1.0.5

• Added s2_projection_filter() and s2_unprojection_filter() to expose the S2 edge tessellator, which can be used to make Cartesian or great circle assumptions of line segments explicit by adding points where necessary (#115).
• Added an s2_cell() vector class to expose a subset of the S2 indexing system to R users (#85, #114).
• Added s2_closest_edges() to make k-nearest neighbours calculation possible on the sphere (#111, #112).
• Added s2_interpolate(), s2_interpolate_normalized(), s2_project(), and s2_project_normalized() to provide linear referencing support on the sphere (#96, #110).
• Fixed import of empty points from WKB (#109).
• Added argument dimensions to s2_options() to constrain the output dimensions of a boolean or rebuild operation (#105, #104, #110).
• Added s2_is_valid() and s2_is_valid_detail() to help find invalid spherical geometries when importing data into S2 (#100).
• Improved error messages when importing and processing data such that errors can be debugged more readily (#100, #98).
• The unary version of s2_union() can now handle MULTIPOLYGON geometries with overlapping rings in addition to other invalid polygons. s2_union() can now sanitize almost any input to be valid spherical geometry with minimal modification (#100, #99).
• Renamed the existing implementation of s2_union_agg() to s2_coverage_union_agg() to make clear that the function only works when the individual geometries do not have overlapping interiors. s2_union_agg() was replaced with a true aggregate union that can handle unions of most geometries (#100, #97).
• Added s2_rebuild_agg() to match s2_union_agg(). Like s2_rebuild(), s2_rebuild_agg() collects the edges in the input and builds them into a feature, optionally snapping or simplifying vertices in the process (#100).

s2 1.0.4

• Fixed errors that resulted from compilation on clang 12.2 (#88, #89).

s2 1.0.3

• Fixed CRAN check errors (#80).

s2 1.0.2

• Fixed CRAN check errors (#71, #75, #72).

s2 1.0.1

• Added layer creation options to s2_options(), which now uses strings rather than numeric codes to specify boolean operation options, geography construction options, and builder options (#70).
• Added s2_rebuild() and s2_simplify(), which wrap the S2 C++ S2Builder class to provide simplification and fixing of invalid geographies (#70).
• The s2 package now builds and passes the CMD check on Solaris (#66, #67).
• Renamed s2_latlng() to s2_lnglat() to keep axis order consistent throughout the package (#69).
• Added s2_bounds_cap() and s2_bounds_rect() to compute bounding areas using geographic coordinates (@edzer, #63).
• s2_*_matrix() predicates now efficiently use indexing to compute the results of many predicate comparisons (#61).

s2 1.0.0

This version is a complete rewrite of the former s2 CRAN package, entirely backwards incompatible with previous versions.