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## Release Notes

#### Boost 1.81

Solved issues

- 1048 Index: Fix dangling references when Indexable is returned by value by IndexableGetter
- 1076 Union: in rare cases it might miss one polygon
- 1081 Union: due to precision it might miss interior rings

Bugfixes

- 1063 Intersection: fix a bug in intersection of simple spherical polygons
- 1064 Formulas: fix a consistency issue in geodesic direct formulas
- 1088 Point: Fix regression for custom point types
- Various fixes for missing include files, warnings, C++20 compilation errors and documentation

#### Boost 1.80

Major improvement

- Support geometric collection in various algorithms

Improvements

- 1014 Projections: Add new projections and fixes existing ones

Solved issues

- 1030 Buffer/simplify: support const points
- 1027 Buffer: support const points
- 1024 Simplify: support different input/output types

Bugfixes

- 1028 Buffer: fix for integer overflow
- 1023 Buffer: fix possible artefacts in linestring buffers
- Various fixes in for each, projections and index

#### Boost 1.79

Major change

- 977 Rescaling is turned off by default. This avoids many related bugs in set operations and buffer.

Improvements

- 923 Added algorithm closest_points for cartesian point/geometry.
- 939 Added algorithm closest_points for other coordinate systems and geometry combinations excl. boxes.
- 961 Added Web Mercator projection.
- 966 More efficient cartesian distance strategy used in simplify.

Solved issues

- 956 Result of simplify algorithm with incorrect closure.
- 962 Runtime error in R-tree deserialization due to load factor.
- 971 R-tree insertion time impacted by use of long double on ARM platforms.

Bugfixes

- 936 Envelope of polygon containing pole.
- 948 Spherical and geographic envelope for near meridian segments.
- 974 Spheroidal normalization utilities for NaN coordinates.
- Various fixes in set operations and buffer.

#### Boost 1.78

Improvements

- 894 Optimization and refactoring of rtree queries.
- 913 DynamicGeometry and GeometryCollection support in various algorithms (undocumented for now).
- 922 DynamicGeometry and GeometryCollection support in distance (undocumented for now).

Solved issues

- 867 Poor performance of rtree query iterator with nearest predicate for big k.
- 870 Compilation error in boost::geometry::self_turns.
- 896 Assertion failure in get_turns with BOOST_GEOMETRY_NO_ROBUSTNESS.

Bugfixes

- 906 Invalid result of buffer on macos-11 with clang-12.
- 921 Compilation errors with c++20 (various compilers) and gcc-5.
- Various fixes in set operations and buffer.

#### Boost 1.77

Improvements

- 812 Umbrella strategies for distance and comparable_distance (undocumented for now).
- 840 Umbrella strategies for various algorithms (undocumented for now).
- 850 Introduced DynamicGeometry and GeometryCollection concepts and support in some algorithms (undocumented for now).
- 855 Various improvements related to strategies. Default strategies are now included with algorithms.

Solved issues

- 865 Exception thrown in rtree serialization.
- 439 Invalid box spherical area computation.
- 838 Invalid result of union_().
- 851 Invalid geographic disjoint segment/box result.
- 861 Invalid result of intersection().

Bugfixes

- 832 Fixed box spherical and geographic area computation.
- 853 Fixed geographic disjoint segment/box.
- 866 Fixed serialization of rtree containing lesser number of elements in root node than minimum.
- 886 Fixed knn rtree query bug causing it to be slow for big k.
- Various fixes in set operations and buffer.

#### Boost 1.76

Improvements

- 670 New IOs to_wkt() and from_wkt() (thanks to Baidyanath Kundu).
- 756 Non cartesian and robust convex hulls.
- 768 Umbrella strategies for relops, setops, index, buffer and more (undocumented for now).
- 797 New azimuth() algorithm.
- 801 Improved accuracy in geographic area computations.
- 820 Parameter scale added to svg_mapper.

Bugfixes

- 808 Fixed compilation error with rtree serialization enabled (thanks to Tristan Carel).
- 815 Fixed issue in buffer().
- Various fixes in set operations and buffer.

Breaking changes

- Removed strategy convex_hull::graham_andrew.

#### Boost 1.75

Improvements

- 726 Umbrella strategies for area, envelope, expand (undocumented for now).
- 733 Added example of adaptation of std::array<> to Point concept (thanks to Ben FrantzDale).
- 745 constexpr added in geometries and arithmetic.
- 747 Added optional traits::make (undocumented for now).
- 748 Modernized usage of type traits.
- 759 MPL_ASSERT replaced with standard static_assert.
- 767 Modernized usage of tuple.

Solved issues

- 716 Dangling proxy references.

Bugfixes

- Various fixes in set operations and buffer.

Deprecation

- 590 Boost.Geometry requires C++14.

#### Boost 1.74

Improvements

- 720 Additional R-tree constructors (thanks to Caian Benedicto).
- Various improvements in buffer, set and relational operations

Solved issues

- 709 memcpy called for object with no trivial copy-assignment
- 721 Compilation error in bgi::detail::rtree::visitors::insert.
- 727 MSVC warning: conditional expression is constant.

Bugfixes

- 700 Missing cases for default strategies in distance algorithm.
- 738 Longitudes out of range in direct geodesic formulas.

#### Boost 1.73

Improvements

- 650 Missing input combinations in intersection() and introduction of tupled-output.
- 671 Added d3::point_xyz geometry model (thanks to Digvijay Janartha).

Solved issues

- 657 Incorrect definition of EPSG3785.

Bugfixes

- 639 R-tree exception-safety improvement.
- 668 Andoyer inverse formula fixed for close points.
- 687 Fixed dangling reference in distance algorithm.

Deprecation

- 590 Support for C++03 has been deprecated and Geometry will require C++14 from Boost 1.75 onwards.

#### Boost 1.72

Improvements

- 500 Karney's solution of inverse geodesic problem for internal use (thanks to Adeel Ahmad).
- 561 New algorithm detail::calculate_point_order() for internal use.
- 584 Support for arbitrary dimensions in matrix_transformer (thanks to Tinko Bartels).
- 616 Various improvements of srs::transformation, incl. support for std threading primitives.
- 627 Improved genericity of relational operations.
- Various improvements related to robustness of set and relational operation.

Solved issues

- 557 Invalid result of distance between point and linestring in spherical-equatorial coordinate system.
- 612 Invalid result of set operations in geographic coordinate system.
- 619 Invalid result of set operations in spherical-equatorial coordinate system.

Bugfixes

- 479 Various fixes for set operations in spherical and geographic coordinate systems.
- 623 Potential integral overflow in set and relational operations.
- 632 Fixed errors in generation of asymmetric one-sided buffer.

#### Boost 1.71

Improvements

- 568 Add a constructor that takes matrix_type to matrix_transformer.
- 605 Improvement of handling of coordinate systems in various algorithms.
- Various improvements related to robustness of set and relational operation.

Solved issues

- 596 boost::geometry::buffer generates (multi)polygon with spike.

Bugfixes

- 595 Fix inaccuracy in geographic point-segment distance computation.
- Fix various compiler warnings.

#### Boost 1.70

Improvements

- 526 New line interpolate algorithm.

Solved issues

- 450 Not supported negative distance in geodesic direct formulas.
- 466 Invalid result of spherical/geographic disjoint(box, polygon).
- 547 Undefined behavior in rtree constructed with zip_iterator.
- 560 Inaccuracy of karney_direct formula.
- 577 R-tree with interprocess allocator compilation error with clang.
- 579 Invalid result of spherical/geographic disjoint(segment, box).

Bugfixes

- 538 Workaround for msvc-12 faulty array initialization.
- 553 Pass spheroid correctly in geographic comparable strategies.
- 570 Fix for spherical/geographic distance between geometries.
- 571 Fix nan result in geographic distance.
- Workarounds in R-tree for compilation errors with gcc-4.6 and msvc-10, 11, 12.

Changes in behavior

- Different strategies expected in envelope for some combinations of geometries.

#### Boost 1.69

Improvements

- 486 Karney's solution of direct geodesic problem for internal use (thanks to Adeel Ahmad).
- 490 Discrete Frechet and Hausdorff distance algorithms (thanks to Yaghyavardhan Singh Khangarot).
- 496 New run-time and upgraded compile-time SRS transformation interfaces (undocumented for now due to potential interface changes).

Solved issues

- 520 Missing documentation for dsv().
- 521 Wrong documentation description for distance().
- 524 Fixed 'enumeration values not handled in switch' warnings.
- 527 Workaround for VS 2017 (msvc-15).

Bugfixes

- 505 Fixed overflow in overlay algorithms (thanks to Dane Springmeyer).
- 518 Fixed passing of temporaries in append() (thanks to xventura81).
- 522 Support python3 in building documentation.

#### Boost 1.68

Improvements

- 469 Horizontal grid shift (nadgrids) in SRS transformations (undocumented for now due to potential interface changes).
- 478 Box-Segment distance for spherical and geographic coordinate systems.
- 487 Missing combinations of geometries in distance for spherical and geographic cs
- 489 Additional direct geodesic problem formulas for internal use

Solved issues

- 470 Assertion failure with short spherical and geographic segments.
- 471 Invalid envelope of spherical polygon
- 498 Unexpected results with expand() and make_inverse() for spherical and geographic CS
- 504 Unused parameter warnings.

Bugfixes

- 488 Handle non-true-references in closing_iterator and ever_circling_range_iterator
- 495 VxWorks 7 cross-compilation issue.

#### Boost 1.67

Improvements

- New map projection and SRS transformation representations (undocumented for now due to potential interface changes).
- New densify() algorithm.
- No longer using std::iterator (thanks to Daniela Engert).
- No longer using allocator directly in the rtree. Replaced with boost::container::allocator_traits (thanks to Daniela Engert).
- Default rtree allocator changed to boost::container::new_allocator to still support move semantics emulation in C++03 with boost::container::allocator_traits.
- Area strategies interface changed. This is potentially a breaking change.
- Radius or Sphere can be passed into spherical strategies.
- Added Point-Box and Box-Box spherical and geographic distance() strategies.
- Simplify (multi)polygons will discard output rings of 2 points or (for closed polygons) 3 points, but it tries to avoid creating those
- Simplify (multi)polygons will omit empty interior rings or polygons from output

Solved issues

- 13386 Workaround for some gcc compilers
- 13381 Compile error with matrix_transformer in Visual C++ 2015
- 13436 Incorrectness in boost::geometry::model::polygon documentation

Bugfixes

- Add missing strategy resolving in length() algorithm, affecting Variant support.
- Simplify (multi)polygons now simplifies closing point

Changes in behavior

- Simplify (multi)polygons now usually rotates input rings before simplifying to select a non collinear point on its convex hull. This improves output.

#### Boost 1.66

Improvements

- Add distance for geographic PointLike/AnyGeometry.

Solved issues

- 12503 Validity of complex polygon

Bugfixes

- Fixes in validity of union/intersection/difference which were sometimes invalid. In most cases, results are valid now.
- Fixes in validity of buffer which were sometimes invalid. In most cases, results are valid now.
- Fixes in results of union/intersection/difference which could be incorrect in very complex cases
- Fixes in set and relational operations for non-cartesian coordinate systems.

#### Boost 1.65

Improvements

- Add correct() overload taking area strategy
- Add is_convex() overload taking side strategy
- Add missing relational operations (covered_by, crosses, equals, etc.) for MultiPoint/AnyGeometry

Solved issues

- 12410 Lack of support of geographic coordinate system in correct()
- 13035 Wrong result of non-cartesian intersection strategies for segments near poles.
- 13057 Wrong result of intersects() for linestrings caused by numerical issue in disjoint() for boxes.

Bugfixes

- Fix is_valid which could return false for multipolygons where an interior ring touches another interior ring
- Fix is_valid which could return false for multipolygons where a polygon was located in an interior ring, all touching each other
- Fix union which could produce invalid results (for some cases, this needs to define BOOST_GEOMETRY_INCLUDE_SELF_TURNS)
- Fix intersection (idem), but some cases are still not yet valid
- Fix difference (idem), but some cases are still not yet valid
- Fix propagation of area strategy into the internals of various algorithms from intersection strategy
- Fix uninitialized variable in relate and reference to temporary in overlay
- Fix error in disjoint for geographic Segment/Box
- Fix handling of non-cartesian geometries in various algorithms

#### Boost 1.64

Improvements

- matrix transformation is now based on Boost.QVM instead of Boost.Ublas

Breaking changes

- ublas_transformer is renamed to matrix_transformer
- explicit modifier is added to constructors of rtree index::dynamic_* parameters
- strategy::area::huiller replaced by strategy::area::spherical

Solved issues

- 363 Missing includes in geometry/index/parameters.hpp
- 364 within(Linear, Areal) compilation error when arguments use different point types
- 370 Buffer Seg Faults with Ring as Input

Solved tickets

- 11899 boost::geometry::equals doesn't handle open polygons
- 11930 Inaccuracy of area::huiller strategy
- 11931 Wrong spherical area with pole encircling polygons
- 12566 Ambiguous template instantiation in equal_to<> when pair value contains raw pointer
- 12861 Segmentation fault in stdlibc++ (gcc 4.8.2) affecting rtree
- 12885 Use BOOST_THROW_EXCEPTION instead of throw

Bugfixes

- Fix distance_measure in get_turn_info

#### Boost 1.63

Improvements

- Intersection: take care that output is valid (work in progres, not yet finished - but more is valid)

Solved tickets

- 12289 Avoid warning/compilation error for std::cout
- 12412 Invalid result of covered_by() with geographic Points and Boxes
- 12413 rtree::remove() not working properly with geographic Points

#### Boost 1.62

Improvements

- Union: take care that output is valid (with some exceptions), also with self-tangent polygons or shared edges
- SVG: support boost::variant of geometries
- SVG: coordinates are now written as double (by default) to svg
- Rename namespace concept to concepts to avoid conflicts with the newest compilers
- New spherical intersection strategy used in relational and set operations for spherical and geographic Geometries (previously cartesian intersection strategy was used for all coordinate systems).

Solved tickets

- 12189 Relational operations not compiling when point types of inputs are different (cartesian, affecting rtree)
- 12287 Invalid result of rtree.query() for contains() predicate
- 12342 Relational operations not compiling when point types of inputs are different (geographic, affecting rtree)

#### Boost 1.61

Additional functionality

- Support within and covered_by for Box/Box in spherical and geographic coordinate systems.

Improvements

- Overlay: handle_tangencies replaced by clusters, fixing many cases with colocated turns

Solved tickets

- 9162 Invalid result of relational operations for non-cartesian Point/Areal.
- 10866 union_ doesn't work in 1.56 and 1.57.
- 11018 Invalid geometry intersection
- 11576 Intersection gives wrong results.
- 11637 Unused parameter warning.
- 11725 union_ fails to create holes
- 11789 Assertion failure or invalid result of set operations for spherical_equatorial coordinate system.
- 11917 Andoyer distance strategy returns 0 for antipodal points (default geographic distance).
- 11928 Improvement of the accuracy of surveyor (cartesian) area strategy.
- 11966 Compilation error in svg() for box and non-int coordinate type.
- 11984 union_() generates self-intersecting polygon
- 11987 rtree::remove() not compiling for geographic CS.
- 12000 Uninitialized reference in (unused) constructor of relate's mask_handler.
- 12106 Invalid assertion failure in envelope() for non-cartesian very short segments.

Bugfixes

- Fix intersects and disjoint for Segment/Box in cartesian coordinate system when Segment is parallel to Box's face.
- Fix relation operations for Point/Areal in spherical and geographic coordinate systems for edge cases.
- Fix intersects and disjoint for Point/Box and Box/Box in spherical and geographic coordinate systems for some cases.
- Fix within and covered_by for Point/Box in spherical and geographic coordinate systems for some cases.

#### Boost 1.60

Solved tickets

- 10803 Union algorithm returning invalid geometry
- 11522 Namespace clash in buffer for traits::detail
- 11533 Assert failure in rtree caused by a bug in remove() if min elements number is 1
- 11607 Private geometry::exception::what()
- 11709 is_simple segfault
- 11710 is_simple - empty geometry logic
- 11711 is_simple and is_valid - Points that are NaN or Infinity

Bugfixes

- Fix colocations of touching interior ring / exterior ring, where it also touches another polygon
- Fix removing values from an empty rtree - no effect and 0 returned instead of assertion failure
- Fix segfault in centroid for multi geometries containing empty single geometries (thanks to Jiri Drbalek)
- Fix liang_barsky strategy for integral coordinates (thanks to Dane Springmeyer)

#### Boost 1.59

Additional functionality

- Added rtree const_iterator, begin(), end() and the support for Boost.Range.
- The support for C++11 `std::initializer_list` in geometries models.
- Disjoint and intersects support the following geometry combinations: multipoint/linestring, multipoint/multilinestring.
- Added relate() and relation() algorithms.
- Intersection has been implemented for combinations of pointlike and linear geometries
- Added implementation for difference(pointlike, linear)
- New algorithm is_empty, returning true if the geometry represents the empty set
- The envelope algorithm supports pointlike and linear geometries in the spherical equatorial coordinate system
- The envelope algorithm supports pointlike geometries in the geographic coordinate system

Improvements

- Upgraded rtree const_query_iterator category to ForwardIterator.
- Buffer performance of buffers around multi-points is improved significantly

Breaking changes

- buffer side strategy now returns error_code instead of bool. If you have your own custom side strategy, it should be adapted

Solved tickets

- 11113 Support easy enumeration of all elements with BOOST_FOREACH
- 11232 Feature request - relate()
- 11236 Invalid result of centroid() for integer coordinate type
- 11268 Regression in boost::geometry::intersection interface with multi_linestring and box -- does not compile on 1.57 VS 1.55
- 11332 Assertion failure in buffer for extreme coordinate differences
- 11346 Segment iterator does not work with ranges returning values instead of references
- 11436 sym_difference(py1, py2, mpy) returns invalid multipolygon

Bugfixes

- Buffer: use a more robust way to calculate the side of an intersection, this fixes several errors in buffer generation
- Fix in selection of segment to which calculate from IP from, in intersection of two segments. Now is selected the one close to a segment-point point, or else the one on the shortest segment. This avoids (rarely occuring) generation of tiny triangles making output polygons invalid
- In rescaling round instead of truncate to the integer grid (this fix and the previous mentioned can have some impact on output geometries)
- Fix potential infinite loop in detail::has_spikes (the loop can happen if the points passed have NaN coordinates)

#### Boost 1.58

Additional functionality

- New algorithm num_segments, returning the number of segments of a geometry
- New overload for is_valid algorithm, that takes a string reference as a second argument and fills it with a message related to the validity or invalidity of the geometry
- New overload for is_valid algorithm, that takes an enum reference as a second argument and fills it with a value related to the validity or invalidity of the geometry
- Disjoint and intersects support the following geometry combinations: point/multipoint, multipoint/multipoint, multipoint/segment, multipoint/box

Improvements

- Buffer now supports flat-ends for linestrings with a bend close to the start (such that buffered segment crosses flat-end).
- Buffer performance is improved significantly
- Partition performance is improved significantly for polygons, potentially enhancing all overlay operations

Solved tickets

- 8379 Invalid comparison of the result of determinant
- 10108 Error in overlay operations in specific cases where geometries touch at one point
- 10201 Suggestion to use different function to compare coordinates [wontfix]
- 10467 Template parameter name coliding with B0 macro name defined in termios.h
- 10640 Invalid result of buffer() for CCW Polygons.
- 10666 MSVC compiler warning C4127: conditional expression is constant
- 10747 Error in rescaling causing errors in areal/areal set operations
- 10770 Buffer fails for large distances, or rough round joins, where concavities where not intersected properly
- 10658 sym_difference yields bad result for int polygons
- 10835 Difference of multilinestring and polygon yields wrong result
- 10861 Rtree failing to compile for Value being a pair or a tuple containing pointer to Geometry and the default equal_to<> used
- 10863 Template parameter name coliding with B0 macro name defined in termios.h (duplicate of 10467)
- 10887 Invalid result of within() and relate() for Linear/MultiPolygon
- 10890 Invalid result of disjoint() for Point/Segment.
- 10904 Invalid calculation of most significant Dimension of a segment in relate_cartesian_segments strategy
- 10912 Invalid result of within() and relate() for Areal/Areal
- 10951 Tests failing on windows with intel compiler due to lack of /bigobj flag.
- 10957 Assertion failure and invalid results of various relational operations.
- 10958 Invalid results of disjoint() L/L and L/A.
- 10959 Assertion failure in get_turns() used with no_rescale_policy.
- 10960 Invalid result of get_turns() for L/A, missing turn.
- 10961 Invalid result of get_turns() for L/A, invalid turn for a Linear spike.
- 11112 Compilation failure on Solaris due to a CS name clash (used for a macro on this platform)
- 11121 Invalid result of difference() for integral coordinates

Bugfixes

- Bug in multipoint/polygon multipoint/multipolygon distance computation (wrong detection of points inside the areal geometry)
- Bug in flatten_iterator's assignment operator causing an access violation
- Bug in Cartesian segment-segment intersection strategy when one segment degenerates to a point and is collinear to the other non-degenerate segment
- Bug in centroid(), non-deterministic result if calculated for e.g. a Polygon with zero-area.
- Bug in buffers for joins with a limited number of points
- Bug in buffers for round joins with limited number of points around sharp corners
- Bug in buffers for joins with large buffer distances
- Bug in buffers for round ends with an odd number of points
- Bug in buffers for flat ends with large buffer distances
- Bug in buffers for interior rings with large negative buffer distances
- Bug in closing_iterator not working properly when the input range is empty
- Bug in is_simple, not handling properly closed simple linestrings within multilinestrings
- Bug in rtree constructors taking a pair of Iterators or a Range (packing algorithm), the use of reference to destroyed temporary when Iterator's reference is not true reference, e.g. for some of the Range Adaptors. It also affects distance() and comparable_distance(). This bug may cause unexpected behavior of the rtree or distance() algorithm, e.g. an assertion failure or a SEGFAULT.
- Bug in rtree count() member function, the use of reference to destroyed temporary when object of type convertible but not the same as value_type or indexable_type is passed. If this happens, wrong result may be returned, in most cases 0.
- Bugs related to the handling of Ranges, preventing compilation of Geometries using non-Container Ranges in some algorithms (thanks to Samuel Debionne)

#### Boost 1.57

Improvements

- The support of parameters convertible to value_type in rtree insert(), remove() and count() functions
- Support for counterclockwise input/output in algorithm buffer
- Support for open-geometry input in algorithm buffer (open output not yet supported)
- Support for degenerate input (point-like linestrings, polygons) in algorithm buffer

Solved tickets

- 6443 Wrong degenerated hulls returned by convex_hull().
- 8402 Implicit conversion warnings
- 9354 Bug in winding strategy affecting within() and covered_by() for non-cartesian coordinate systems
- 10177 Missing include
- 10345 Distance fails to compile for some coordinate types
- 10398 Wrong neighbour check in buffer, calculating turns
- 10421 Invalid Point-Box distance for spherical CS
- 10562 Invalid number of Points in the result of convex_hull() for open output
- 10615 Rtree constructor feature request
- 10643 Invalid point_on_surface() result for big coordinates
- 10647 Invalid result of disjoint() in some cases when polygon is inside inner ring of other polygon
- 10668 Implicit conversion warnings (duplicated 8402)

Bugfixes

- Several fixes of bugs in algorithm buffer
- Bug in point_on_surface() for CCW Polygons (extreme_points()) and numerical issue (thanks to Matt Amos)
- Bug in disjoint() for A/A fixed by replacement of point_on_surface() with point_on_border() (thanks to Matt Amos)
- The result of convex_hull(), duplicated Point in open output, too small number of Points for 1- and 2-Point input
- Imprecision for big coordinates in centroid(), fixed by Points translation (related with ticket 10643)
- for_each_segment() not taking into account the last segment of open Geometry

#### Boost 1.56

Additional functionality

- New algorithm buffer for inflating/deflating geometries (buffer itself already existed but that was only to enlarge a box)
- New algorithm remove_spikes, algorithm to remove spikes from a ring, polygon or multi_polygon
- New algorithm point_on_surface, generating a point lying on the surface (interior) of the polygon
- New algorithm is_simple, returning true if a geometry is simple according to the OGC standard
- New algorithm is_valid, returning true if a geometry is valid according to the OGC standard
- New algorithm crosses for checking this spatial relation according to the OGC standard
- The set operation algorithms (difference, intersection, sym_difference and union_) now support as input pairs of pointlike or linear geometries
- The distance and comparable_distance algorithms now support all pairs of geometry combinations
- The spatial relations which didn't support it (covered_by, touches, within, etc.) now support as input linear and/or areal geometries
- The support for boost::variants as input geometries in various algorithms
- The rtree support for indexing segments
- The rtree nearest() predicate support for arbitrary geometries

Improvements

- The rtree pack-creation algorithm optimization (thanks to Lu Wang)

Solved tickets

- 8310 Wrong results with overlapping polygons (fixed using point_on_surface for disjoint)
- 8375 sym_difference of non-closed polygons returns closed polygon
- 8376 difference of non-closed polygons returns closed polygon
- 9081 Booleans create self-intersecting polygons from non-self-intersecting polygons
- 9245 Check for process errors in make_qbk.py
- 9563 (Sym)difference not successful, fixed by rescaling to robust type
- 9628 Wrong result of within() due to the winding strategy not working correctly for nearly-horizontal segments
- 9828 boost::geometry::union_(...) creates redundant closing point
- 9871 Remove spike in polygon with only a spike
- 9941 Add support for touches(box, box)
- 9947 Missing info about WKT in documentation
- 9759 Invalid results of R-tree knn queries for non-cartesian coordinate systems
- 10019 Difference of Linestring and Box returns their intersection
- 10077 Wrong types in concept checks in boost/geometry/arithmetic/arithmetic.hpp
- 10234 Wrong results of covered_by() for nearly-horizontal segments

Bugfixes

- intersects(polygon) could return a self-intersection-point for its closing point, fixed
- equals() could return invalid results for non-simple linear geometries according to the OGC standard, fixed
- touches() didn't work properly for CCW areal geomtries, fixed
- rtree nearest queries returned wrong elements for non-cartesian coordinate systems, fixed
- rtree crashed in some cases when used with Interprocess allocator, fixed

#### Boost 1.55

Additional functionality

- Added centroid for segment type
- Added intersects() and disjoints() for Segment-Box and Linestring-Box
- Added rtree creation using packing algorithm
- Added contains() and covers() spatial query predicates
- Added iterative queries

Documentation

Bugfixes

- In some cases .back() or .clear() was called, violating the usage of Concepts. Fixed for the reported cases
- Use consistent side information in cart_intersect and get_turn_info and handle_tangencies and enrich_intersection_info. This is done by switching to integer (if necessary) for the specific 6 points only, zooming in on the 4 or 3 segments

Solved tickets

- 6958 Intersection generates self-intersection. Caused by spike, fixed
- 8364 Invalid input exception, caused by spikes in previous steps, fixed
- 8365 Invalid input exception, caused by spikes in previous steps, fixed
- 8969 boost::geometry::model::point single argument constructor should be explicit
- 8825 Patch adding member variable documentation to doxygen_xml2qbk
- 8652 Intersection fails for triangle-triangle intersection. Caused by spike, fixed
- 9047 Boost files that include themselves (strategies/intersection.hpp), fixed

Internal changes

- Adapted projected_point<> distance strategy, point-type in template is replaced by calculation-type
- Adapted transform strategies, they have points now as member-template, and calculation-type as template. Similar to what was done for projected_point distance
- Spikes (could be generated in difference) in integer-based overlays are now avoided during generation
- Cleanup, removed old MSVC2005 project files
- R*-tree balancing algorithm optimized

#### Boost 1.54

Additional functionality

- added Spatial Index, developed for Boost.Geometry by Adam Wulkiewicz. The spatial index was originally started by Federico J. Fernandez during the Google Summer of Code 2008 program, mentored by Hartmut Kaiser.
- added SVG-output, this was already in extensions for several years

Documentation

- small fixes of missing words
- fixes in doc of template parameters (convex_hull, exterior_ring, return_buffer)

Bugfixes

- collinear opposite segments did sometimes (in circles) have a robustness issue, fixed
- fixed insertion of false intersection point (found by buffer)
- applied patch of Vladimir Petrovic for debugging traversals

Solved tickets

- 7462 degenerate union result for float, fixed
- 7465 wrong construtors access type in scale_transformer class, fixed
- 7802 cart_intersect.hpp unused parameter warnings, fixed
- 8254 faulty intersection, fixed
- 8393 polygon model doesn't adhere to stated Polygon concept rules, doc updated.
- 8403 silenced compiler warning C4127: conditional expression is constant
- 8405 silenced compiler warning C4189: '...' : local variable is initialized but not referenced

Internal changes

- Made several algorithms variant-aware (append, area, clear, convert, equals, length, num_points)

#### Boost 1.53

Bugfixes

- avoid generating output polygons with interior rings below minimum size (e.g. one or two points)
- `geometry::disjoint` for degenerate segments (patched by Karsten Ahnert)
- problem in `geometry::difference` for missing handling tangency, reported by H2
- fixed `geometry::for_each` for use with Lambda's
- fixed `geometry::comparable_distance` point-linestring (and -range, -polygon)

Additional functionality

- combinations for `geometry::disjoint`: point/ring, point/polygon, point/multi_polygon
- combinations for `geometry::intersects`: point/ring, point/polygon, point/multi_polygon

Internal changes

- updates in specializations/not_implemented for various algorithms (as in an earlier version, these changes are still going on; they take care for simplified structs, better error reporting, and automatized documentation)
- fixes in unit tests

#### Boost 1.51

Breaking changes

- points accessed through a pointer (e.g. in a linestring) should now be specialized without the pointer. In previous versions a type `my_point` used like `linestring<my_point*>` had to be specalized like: `template<> struct tag<my_point*>`. Now the library itself removes the pointer before calling the traits class, so now it should be like: `template<> struct tag<my_point>`

Bugfixes

- intersection was sometimes wrong for integer points, fixed
- documentation, order of parameters in simplify was wrong, fixed

Solved tickets

- 7030 spherical distance, fixed (by patch of Karsten Ahnert)

#### Boost 1.50

Bugfixes

- the return type of comparable projected point strategy for integer points was wrong (integer), fixed
- several robustness issues in intersection of segments and polygons, fixed
- invalid intersection output is filtered out
- disjoint for multi_polygon's might incorrectly return true, fixed

Solved tickets

- 6585 patch for alternative syntax multipoint, applied
- 6584 patch for bug in distance, applied
- 5730 same issue as 6584, fixed
- 6166 patch for missing transformation, applied
- 6696 invalid intersection output, was (by chance) already fixed in Trunk before reported

Additional functionality

- added algorithm "touches" (OGC SF compliant) for *polygon/*polygon

#### Boost 1.49

Breaking changes

- point_xy was accidentally included in one of the headerfiles. If the point_xy class is used, it should be included explicitly now.

Bugfixes

- bugfix: distance for multi-geometries ignored specified distance strategy. Fixed
- bugfix: difference for polygon/multi_polygon (reported 2011/10/24 on GGL-list)
- bugfix: raise exception for calculation of distances of multi-geometrie(s) where one of them is empty
- bugfix: multi DSV did not correctly use settings, fixed
- bugfix: self-intersections could sometimes be missed (introduced in 1.48), fixed
- bugfix: convex hull crashed on empty range (e.g. empty multi point), fixed
- bugfix: area/centroid/side/intersection/distance did not work for "int" type filled with large (but not overflowing) integers. Fixed.
- bugfix: disjoint/intersect did not work for degenerate linestrings. Fixed.
- bugfix: covered_by did not compile for a ring. Fixed.

Solved tickets

- 6019 convex_hull / area, fixed.
- 6021 convex_hull / append (multipoint), fixed.
- 6028 Documentation: closure, fixed.
- 6178 Missing headerfile, fixed.

Additional functionality

- support for line/polygon intersections and differences
- support for convert of segment/box of different point types
- support for append for multi point
- the scalar function distance now throws an empty_input_exception on empty input

Documentation

- updated support status in several algorithms
- updated conformance to OGC or std
- other updates and fixes

Internal changes

- updates in specializations/not_implemented for distance/convert/assign/area/with/covered_by
- move of wkt/dsv to io folder, making domains redundant
- warnings: strategy concepts assigned to zero to avoid clang warnings (patched by Vishnu)
- warnings: there were several unused parameters, for which gcc/clang warned (patched by Christophe)

#### Boost 1.48

Bugfixes

- Robustness issue, in some circumstances the union failed to output. Fixed.
- Robustness issue, in some circumstances the calculated intersection point was outside the segment. Fixed.
- Concept issue, cartesian intersect didn't understand segments other than the provided one. Fixed.
- Sometimes self-intersections in linestrings were missed. Fixed.
- The fusion coordinate system was not registered correctly. Fixed.

Solved tickets

- 5726 Segment intersection algorithm still assumes 'first', 'second' members
- 5744 Mistake in fusion adapt example
- 5748 Needed to include <boost/foreach.hpp>
- 5954 distance_pythagoras skips sqrt() step

Improvements on algorithms

- Checking self-intersections is now not done automatically, this can blast performance.
- Besides that, checking self-intersections is made faster.
- Intersections now avoid outputting duplicate points. So they output the minimal set.

Additional algorithms

- covered_by: within is defined as "within, not on boundary". covered_by is "within or on boundary"

Additional functionality

- within: strategies can now be specified for within<point, box> and within<box, box>
- convert: a much broader range of conversions is supported
- assign: idem, (currently partly) synonym for convert (but reversed arguments)

Additional coordinate types

- Basic (limited) support for Boost.Rational

#### Boost 1.47

Original release