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Fixed #26455 -- Allowed filtering and repairing invalid geometries.

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Added the IsValid and MakeValid database functions, and the isvalid lookup,
all for PostGIS.

Thanks Tim Graham for the review.
This commit is contained in:
Daniel Wiesmann 2016-04-06 12:50:25 +01:00 • committed by Tim Graham
parent f6ca63a9f8
commit c12a00e554
14 changed files with 121 additions and 17 deletions
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39
docs/ref/contrib/gis/functions.txt
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@ -25,13 +25,12 @@ Function's summary:
================== ======================= ====================== =================== ================== =====================
Measurement Relationships Operations Editors Output format Miscellaneous
================== ======================= ====================== =================== ================== =====================
:class:`Area` :class:`BoundingCircle` :class:`Difference` :class:`ForceRHR` :class:`AsGeoJSON` :class:`MemSize`
:class:`Distance` :class:`Centroid` :class:`Intersection` :class:`Reverse` :class:`AsGML` :class:`NumGeometries`
:class:`Length` :class:`Envelope` :class:`SymDifference` :class:`Scale` :class:`AsKML` :class:`NumPoints`
:class:`Perimeter` :class:`PointOnSurface` :class:`Union` :class:`SnapToGrid` :class:`AsSVG`
:class:`Transform` :class:`GeoHash`
:class:`Area` :class:`BoundingCircle` :class:`Difference` :class:`ForceRHR` :class:`AsGeoJSON` :class:`IsValid`
:class:`Distance` :class:`Centroid` :class:`Intersection` :class:`MakeValid` :class:`AsGML` :class:`MemSize`
:class:`Length` :class:`Envelope` :class:`SymDifference` :class:`Reverse` :class:`AsKML` :class:`NumGeometries`
:class:`Perimeter` :class:`PointOnSurface` :class:`Union` :class:`Scale` :class:`AsSVG` :class:`NumPoints`
:class:`SnapToGrid` :class:`GeoHash`
:class:`Transform`
:class:`Translate`
================== ======================= ====================== =================== ================== =====================
@ -291,6 +290,18 @@ intersection between them.
MySQL support was added.
``IsValid``
===========
.. class:: IsValid(expr)
.. versionadded:: 1.10
*Availability*: PostGIS
Accepts a geographic field or expression and tests if the value is well formed.
Returns ``True`` if its value is a valid geometry and ``False`` otherwise.
``Length``
==========
@ -308,6 +319,20 @@ specify if the calculation should be based on a simple sphere (less
accurate, less resource-intensive) or on a spheroid (more accurate, more
resource-intensive) with the ``spheroid`` keyword argument.
``MakeValid``
=============
.. class:: MakeValid(expr)
.. versionadded:: 1.10
*Availability*: PostGIS
Accepts a geographic field or expression and attempts to convert the value into
a valid geometry without losing any of the input vertices. Geometries that are
already valid are returned without changes. Simple polygons might become a
multipolygon and the result might be of lower dimension than the input.
``MemSize``
===========