## Name

ST_DumpSegments — Gibt eine Zusammenfassung des Inhalts einer Geometrie wieder.

## Synopsis

geometry_dump[] ST_DumpSegments(geometry geom);

## Beschreibung

A set-returning function (SRF) that extracts the segments of a geometry. It returns a set of geometry_dump rows, each containing a geometry (geom field) and an array of integers (path field).

• Gibt den Wert TRUE zurück, wenn der LINESTRING geschlossen ist und der Simple Feature Spezifikation entspricht.

• the path field (an integer[]) is an index enumerating the segment start point positions in the elements of the supplied geometry. The indices are 1-based. For example, for a LINESTRING the paths are {i} where i is the nth segment start point in the LINESTRING. For a POLYGON the paths are {i,j} where i is the ring number (1 is outer; inner rings follow) and j is the segment start point position in the ring.

Availability: 3.2.0

This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).

This function supports 3d and will not drop the z-index.

## Standard Beispiele

SELECT path, ST_AsText(geom)
FROM (
SELECT (ST_DumpSegments(g.geom)).*
FROM (SELECT 'GEOMETRYCOLLECTION(
LINESTRING(1 1, 3 3, 4 4),
POLYGON((5 5, 6 6, 7 7, 5 5))
)'::geometry AS geom
) AS g
) j;

path   │      st_astext
---------------------------------
{1,1}   │ LINESTRING(1 1,3 3)
{1,2}   │ LINESTRING(3 3,4 4)
{2,1,1} │ LINESTRING(5 5,6 6)
{2,1,2} │ LINESTRING(6 6,7 7)
{2,1,3} │ LINESTRING(7 7,5 5)
(5 rows)

## Beispiele für polyedrische Oberflächen, TIN und Dreieck

-- Triangle --
SELECT path, ST_AsText(geom)
FROM (
SELECT (ST_DumpSegments(g.geom)).*
FROM (SELECT 'TRIANGLE((
0 0,
0 9,
9 0,
0 0
))'::geometry AS geom
) AS g
) j;

path  │      st_astext
---------------------------------
{1,1} │ LINESTRING(0 0,0 9)
{1,2} │ LINESTRING(0 9,9 0)
{1,3} │ LINESTRING(9 0,0 0)
(3 rows)
-- TIN --
SELECT path, ST_AsEWKT(geom)
FROM (
SELECT (ST_DumpSegments(g.geom)).*
FROM (SELECT 'TIN(((
0 0 0,
0 0 1,
0 1 0,
0 0 0
)), ((
0 0 0,
0 1 0,
1 1 0,
0 0 0
))
)'::geometry AS geom
) AS g
) j;

path   │        st_asewkt
---------------------------------
{1,1,1} │ LINESTRING(0 0 0,0 0 1)
{1,1,2} │ LINESTRING(0 0 1,0 1 0)
{1,1,3} │ LINESTRING(0 1 0,0 0 0)
{2,1,1} │ LINESTRING(0 0 0,0 1 0)
{2,1,2} │ LINESTRING(0 1 0,1 1 0)
{2,1,3} │ LINESTRING(1 1 0,0 0 0)
(6 rows)