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Migrating from PyGEOS

Migrating from PyGEOS#

The PyGEOS package was merged with Shapely in December 2021 and will be released as part of Shapely 2.0. No further development will take place for the PyGEOS package (except for providing up to date packages until Shapely 2.0 is released).

Therefore, everybody using PyGEOS is highly recommended to migrate to Shapely 2.0.

Generally speaking, this should be a smooth experience because all functionality of PyGEOS was added to Shapely. All vectorized functions availabe in pygeos have been added to the top-level shapely module, with only minor differences (see below). Migrating from PyGEOS to Shapely 2.0 can thus be done by replacing the pygeos import and module calls:

import pygeos
polygon = pygeos.box(0, 0, 2, 2)
points = pygeos.points(...)
pygeos.contains(polygon, points)

Using Shapely 2.0, this can now be written as:

import shapely
polygon = shapely.box(0, 0, 2, 2)
points = shapely.points(...)
shapely.contains(polygon, points)

In addition, you now also have the scalar interface of Shapely which wasn’t implemented in PyGEOS.

Differences between PyGEOS and Shapely 2.0#

STRtree API changes#

Functionality-wise, everything from pygeos.STRtree is available in Shapely 2.0. But while merging into Shapely, some methods have been changed or merged:

  • The query() and query_bulk() methods have been merged into a single query() method. The query() method now accepts an array of geometries as well in addition to a single geometry, and in that case it will return 2D array of indices.

    It should thus be a matter of replacing query_bulk with query in your code.

    See STRtree.query() for more details.

  • The nearest() method was changed to return an array of the same shape as the input geometries. Thus, for a scalar geometry it now returns a single integer index (instead of a (2, 1) array), and for an array of geometries it now returns a 1D array of indices ((n,) array instead of a (2, n) array).

    See STRtree.nearest() for more details.

  • The nearest_all() method has been replaced with query_nearest(). For an array of geometries, the output is the same, but when passing a scalar geometry as input, the method now returns a 1D array instead of a 2D array (consistent with query()).

    In addition, this method gained the new exclusive and all_matches keywords (with defaults preserving existing behaviour from PyGEOS). See STRtree.query_nearest() for more details.

Other differences#

  • The pygeos.Geometry(..) constructor has not been retained in Shapely (the class exists as base class, but the constructor is not callable). Use one of the subclasses, or shapely.from_wkt(..), instead.

  • The apply() function was renamed to transform().

  • The tolerance keyword of the segmentize() function was renamed to max_segment_length.

  • The quadsegs keyword of the buffer() and offset_curve() functions was renamed to quad_segs.

  • The preserve_topology keyword of simplify() now defaults to True instead of False.

  • The behaviour of union_all() / intersection_all() / symmetric_difference_all was changed to return an empty GeometryCollection for an empty or all-None sequence as input (instead of returning None).

  • The radius keyword of the buffer() funtion was renamed to distance.

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