# 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.