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Triangulates a polygonal geometry
Triangulates a polygonal geometry.
NOTE: this function returns a geometry representing the triangulated result.
Compute a visibility polygon from a point or a segment in a polygon geometry
Visibility from the point
Visibility from the segment
Computes y-monotone partition of the polygon geometry
Computes y-monotone partition of the polygon geometry.
A partition of a polygon P is a set of polygons such that the interiors of the polygons do not intersect and the union of the polygons is equal to the interior of the original polygon P. A y-monotone polygon is a polygon whose vertices v1,…,vn can be divided into two chains v1,…,vk and vk,…,vn,v1, such that any horizontal line intersects either chain at most once. This algorithm does not guarantee a bound on the number of polygons produced with respect to the optimal number.
Y-Monotone Partition (same example As <xref linkend="CG_ApproxConvexPartition"/>, <xref linkend="CG_GreeneApproxConvexPartition"/> and <xref linkend="CG_OptimalConvexPartition"/>)
Computes the straight skeleton partition of a polygon.
Computes the straight skeleton partition of the input polygon geometry <parameter>geom</parameter>. The straight skeleton is a partitioning of the polygon into faces formed by tracing the collapse of its edges. If <parameter>auto_orientation</parameter> is set to true, the function will automatically adjust the orientation of the input polygon to ensure correct results.
Availability: 3.6.0 - requires SFCGAL &gt;= 2.0.0.
Straight Skeleton Partition of polygon
Computes a 3D buffer around a geometry.
Generates a 3D buffer around the input geometry <parameter>geom</parameter> with a specified <parameter>radius</parameter>. The buffer is constructed in 3D space, creating a volumetric representation of the geometry's surroundings. The <parameter>segments</parameter> parameter defines the number of segments used to approximate the curved sections of the buffer, with a minimum value of 4 segments required. The <parameter>buffer_type</parameter> specifies the type of buffer to create: 0: Rounded buffer (default) 1: Flat buffer 2: Square buffer
Input geometry must be a Point or LineString.
Availability: 3.6.0 - requires SFCGAL &gt;= 2.0.0
The following images were rendered pasting the output of the ST_AsX3D query into <link xlink:href="https://postgis.net/docs/support/viewers/x3d_viewer.htm">X3D Viewer</link>.
segments=32 (rounded buffer)
5 segments rounded
32 segments, round
32 segments, square
, <xref linkend="ST_3DConvexHull"/>, <xref linkend="ST_AsX3D"/>
Rotates a geometry by a given angle around the origin (0,0).
Rotates the input geometry <parameter>geom</parameter> by <parameter>angle</parameter> radians around the origin point (0,0). The rotation is performed in 2D space; Z coordinates are not modified. Positive angles rotate the geometry counter-clockwise.
, <xref linkend="ST_Rotate"/>
Rotates a geometry by a given angle around a specified point in 2D.
Rotates the input geometry <parameter>geom</parameter> by <parameter>angle</parameter> radians around the point (<parameter>cx</parameter>, <parameter>cy</parameter>). The rotation is performed in 2D space; Z coordinates are dropped. Positive angles rotate the geometry counter-clockwise.
, <xref linkend="CG_3DRotate"/>
Rotates a geometry in 3D space around an axis vector.

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  1. postgis
  2. PostGIS Manual
  3. English
Generates a 3D buffer around the input geometry <parameter>geom</parameter> with a specified <parameter>radius</parameter>. The buffer is constructed in 3D space, creating a volumetric representation of the geometry's surroundings. The <parameter>segments</parameter> parameter defines the number of segments used to approximate the curved sections of the buffer, with a minimum value of 4 segments required. The <parameter>buffer_type</parameter> specifies the type of buffer to create: 0: Rounded buffer (default) 1: Flat buffer 2: Square buffer
Generates a 3D buffer around the input geometry <parameter>geom</parameter> with a specified <parameter>radius</parameter>. The buffer is constructed in 3D space, creating a volumetric representation of the geometry's surroundings. The <parameter>segments</parameter> parameter defines the number of segments used to approximate the curved sections of the buffer, with a minimum value of 4 segments required. The <parameter>buffer_type</parameter> specifies the type of buffer to create: 0: Rounded buffer (default) 1: Flat buffer 2: Square buffer
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Source string description
Tag: para
Flags
no-c-format, read-only
String age
3 months ago
Last updated
3 months ago
Source string age
3 months ago
Translation file
doc/po/templates/postgis-manual.pot, string 4836