mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-23 16:42:35 +00:00
f6ed58d1fd
git-svn-id: http://svn.osgeo.org/postgis/trunk@14869 b70326c6-7e19-0410-871a-916f4a2858ee
206 lines
18 KiB
SQL
206 lines
18 KiB
SQL
---
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--- Tests for GEOS/JTS implemented functions
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---
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---
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-- Repeat all tests with new function names.
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SET client_min_messages TO NOTICE;
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SELECT 'buffer', ST_astext(ST_SnapToGrid(ST_buffer('POINT(0 0)'::geometry, 1, 2), 1.0e-6));
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SELECT 'geomunion', ST_astext(ST_union('POINT(0 0)'::geometry, 'POINT(1 1)'::geometry));
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SELECT 'convexhull', ST_asewkt(ST_convexhull('POLYGON((0 0, 10 0, 10 10, 0 10, 0 0),(2 2, 2 4, 4 4, 4 2, 2 2))'::geometry));
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SELECT 'relate', ST_relate('POINT(0 0)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry);
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SELECT 'relate', ST_relate('POINT(0 0)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry, 'F0FFFF*02');
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SELECT 'relate', ST_relate('POINT(0 0)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry, 'F0FFF0*02');
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SELECT 'disjoint', ST_disjoint('POINT(0 0)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry);
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SELECT 'touches', ST_touches('LINESTRING(0 10, 0 -10)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry);
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SELECT 'intersects', ST_intersects('LINESTRING(0 10, 0 -10)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry);
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SELECT 'crosses', ST_crosses('LINESTRING(0 10, 0 -10)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry);
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SELECT 'crosses', ST_crosses('LINESTRING(0 10, 0 -10)'::geometry, 'LINESTRING(-4 0, 1 1)'::geometry);
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-- PIP - point within polygon
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SELECT 'within100', ST_within('POINT(5 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on vertex of polygon
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SELECT 'within101', ST_within('POINT(0 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point outside polygon
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SELECT 'within102', ST_within('POINT(-1 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on edge of polygon
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SELECT 'within103', ST_within('POINT(0 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'within104', ST_within('POINT(0 12)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point vertically aligned with polygon vertex
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SELECT 'within105', ST_within(ST_GeomFromText('POINT(521513 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - repeated vertex
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SELECT 'within106', ST_within(ST_GeomFromText('POINT(521513 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - multipoint within polygon
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SELECT 'within107', ST_within('MULTIPOINT(5 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'within108', ST_within('MULTIPOINT(5 5, 5 7)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint on vertices of polygon
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SELECT 'within109', ST_within('MULTIPOINT(0 0, 10 10)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint partly outside of polygon
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SELECT 'within110', ST_within('MULTIPOINT(5 5, 15 7)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint not fully within polygon (but at least one point still fully within, so "within" passes)
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SELECT 'within111', ST_within('MULTIPOINT(5 5, 10 10)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point within polygon
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SELECT 'disjoint100', ST_disjoint('POINT(5 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon vertex
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SELECT 'disjoint101', ST_disjoint('POINT(0 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point outside polygon
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SELECT 'disjoint102', ST_disjoint('POINT(-1 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon edge
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SELECT 'disjoint103', ST_disjoint('POINT(0 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'disjoint104', ST_disjoint('POINT(0 12)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point vertically aligned with polygon vertex
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SELECT 'disjoint105', ST_disjoint(ST_GeomFromText('POINT(521513 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - repeated vertex
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SELECT 'disjoint106', ST_disjoint(ST_GeomFromText('POINT(521543 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - point within polygon
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SELECT 'disjoint150', ST_disjoint('POINT(5 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon vertex
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SELECT 'disjoint151', ST_disjoint('POINT(0 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point outside polygon
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SELECT 'disjoint152', ST_disjoint('POINT(-1 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon edge
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SELECT 'disjoint153', ST_disjoint('POINT(0 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'disjoint154', ST_disjoint('POINT(0 12)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point vertically aligned with polygon vertex
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SELECT 'disjoint155', ST_disjoint(ST_GeomFromText('POINT(521513 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - repeated vertex
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SELECT 'disjoint156', ST_disjoint(ST_GeomFromText('POINT(521543 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - point within polygon
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SELECT 'intersects100', ST_intersects('POINT(5 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon vertex
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SELECT 'intersects101', ST_intersects('POINT(0 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point outside polygon
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SELECT 'intersects102', ST_intersects('POINT(-1 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon edge
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SELECT 'intersects103', ST_intersects('POINT(0 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'intersects104', ST_intersects('POINT(0 12)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point vertically aligned with polygon vertex
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SELECT 'intersects105', ST_intersects(ST_GeomFromText('POINT(521513 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - repeated vertex
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SELECT 'intersects106', ST_intersects(ST_GeomFromText('POINT(521543 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - multipoint on polygon vertex
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SELECT 'intersects111', ST_Intersects('MULTIPOINT ((0 0))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint outside polygon
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SELECT 'intersects112', ST_intersects('MULTIPOINT ((-1 0))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint on polygon edge
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SELECT 'intersects113', ST_intersects('MULTIPOINT ((0 5))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'intersects114', ST_intersects('MULTIPOINT ((0 5), (0 8))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint in line with polygon edge
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SELECT 'intersects115', ST_intersects('MULTIPOINT ((0 12))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint vertically aligned with polygon vertex
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SELECT 'intersects116', ST_intersects(ST_GeomFromText('MULTIPOINT ((521513 5377804))', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - repeated vertex
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SELECT 'intersects117', ST_intersects(ST_GeomFromText('MULTIPOINT ((521543 5377804))', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - multipoint within polygon
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SELECT 'intersects118', ST_intersects('MULTIPOINT ((5 5))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'intersects119', ST_intersects('MULTIPOINT ((5 5), (7 7))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - multipoint partially within polygon
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SELECT 'intersects120', ST_intersects('MULTIPOINT ((5 5), (15 5))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'intersects121', ST_intersects('MULTIPOINT ((15 5), (5 5))'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point within polygon
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SELECT 'intersects150', ST_intersects('POINT(5 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon vertex
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SELECT 'intersects151', ST_intersects('POINT(0 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point outside polygon
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SELECT 'intersects152', ST_intersects('POINT(-1 0)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point on polygon edge
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SELECT 'intersects153', ST_intersects('POINT(0 5)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'intersects154', ST_intersects('POINT(0 12)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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-- PIP - point vertically aligned with polygon vertex
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SELECT 'intersects155', ST_intersects(ST_GeomFromText('POINT(521513 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - repeated vertex
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SELECT 'intersects156', ST_intersects(ST_GeomFromText('POINT(521543 5377804)', 32631), ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631));
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-- PIP - point within polygon
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SELECT 'contains100', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'POINT(5 5)'::geometry);
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-- PIP - point on vertex of polygon
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SELECT 'contains101', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'POINT(0 0)'::geometry);
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-- PIP - point outside polygon
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SELECT 'contains102', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'POINT(-1 0)'::geometry);
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-- PIP - point on edge of polygon
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SELECT 'contains103', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'POINT(0 5)'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'contains104', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'POINT(0 12)'::geometry);
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-- PIP - point vertically aligned with polygon vertex
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SELECT 'contains105', ST_contains(ST_GeomFromText('POLYGON((521526 5377783, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631), ST_GeomFromText('POINT(521513 5377804)', 32631));
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-- PIP - repeated vertex
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SELECT 'contains106', ST_contains(ST_GeomFromText('POLYGON((521526 5377783, 521482 5377811, 521481 5377811, 521494 5377832, 521539 5377804, 521526 5377783))', 32631), ST_GeomFromText('POINT(521513 5377804)', 32631));
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-- PIP - multipoint within polygon
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SELECT 'contains110', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((5 5))'::geometry);
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-- PIP - multipoint on vertex of polygon
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SELECT 'contains111', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((0 0))'::geometry);
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SELECT 'contains112', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((0 0), (10 0))'::geometry);
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-- PIP - multipoint outside polygon
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SELECT 'contains113', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((-1 0))'::geometry);
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-- PIP - multipoint partially outside polygon
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SELECT 'contains114', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((-1 0), (5 5))'::geometry);
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SELECT 'contains115', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((5 5), (-1 0))'::geometry);
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-- PIP - point on edge of polygon
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SELECT 'contains116', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((0 5))'::geometry);
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-- PIP - point in line with polygon edge
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SELECT 'contains117', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((0 12))'::geometry);
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-- PIP - multipoint within polygon
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SELECT 'contains118', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((5 5), (7 7))'::geometry);
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-- PIP - point on edge of polygon and within
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SELECT 'contains119', ST_contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'MULTIPOINT ((0 5), (5 5))'::geometry);
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-- moved here from regress.sql
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select 'within119', ST_within('LINESTRING(-1 -1, -1 101, 101 101, 101 -1)'::GEOMETRY,'BOX3D(0 0, 100 100)'::BOX3D);
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select 'within120', ST_within('LINESTRING(-1 -1, -1 100, 101 100, 101 -1)'::GEOMETRY,'BOX3D(0 0, 100 100)'::BOX3D);
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SELECT 'contains120', ST_Contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'LINESTRING(1 10, 9 10, 9 8)'::geometry);
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SELECT 'contains121', ST_Contains('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry, 'LINESTRING(1 10, 10 10, 10 8)'::geometry);
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SELECT 'within130', ST_Within('LINESTRING(1 10, 9 10, 9 8)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'within131', ST_Within('LINESTRING(1 10, 10 10, 10 8)'::geometry, 'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'overlaps', ST_overlaps('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry,'POINT(5 5)'::geometry);
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SELECT 'isvalid', ST_isvalid('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))'::geometry);
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SELECT 'isvalid', ST_isvalid('POLYGON((0 0, 0 10, 10 10, -5 10, 10 0, 0 0))'::geometry);
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SELECT 'isvalid', ST_isvalid('GEOMETRYCOLLECTION EMPTY'::geometry);
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SELECT 'intersection', ST_astext(ST_intersection('LINESTRING(0 10, 0 -10)'::geometry, 'LINESTRING(0 0, 1 1)'::geometry));
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SELECT 'difference', ST_astext(ST_difference('LINESTRING(0 10, 0 -10)'::GEOMETRY, 'LINESTRING(0 2, 0 -2)'::GEOMETRY));
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SELECT 'boundary', ST_astext(ST_boundary('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0),(2 2, 2 4, 4 4, 4 2, 2 2))'::geometry));
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SELECT 'symdifference', ST_astext(ST_symdifference('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0),(2 2, 2 4, 4 4, 4 2, 2 2))'::geometry, 'LINESTRING(0 0, 20 20)'::geometry));
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SELECT 'issimple', ST_issimple('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0),(2 2, 2 4, 4 4, 4 2, 2 2))'::geometry);
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SELECT 'equals', ST_equals('LINESTRING(0 0, 1 1)'::geometry, 'LINESTRING(1 1, 0 0)'::geometry);
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WITH inp AS ( SELECT
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'POLYGON((0 0, 0 10, 10 10, 10 0, 0 0),(2 2, 2 4, 4 4, 4 2, 2 2))'
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::geometry as g )
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SELECT 'pointonsurface', ST_Contains(g, ST_pointonsurface(g)) from inp;
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SELECT 'centroid', ST_astext(ST_centroid('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0),(2 2, 2 4, 4 4, 4 2, 2 2))'::geometry));
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SELECT 'centroid2', ST_astext(ST_centroid('LINESTRING(0 2, 0 0, 1 0, 1 2)'::geometry));
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SELECT 'centroid3', ST_astext(ST_centroid('MULTIPOINT(0 2, 0 0, 1 0, 1 2)'::geometry));
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SELECT 'centroid4', ST_astext(ST_centroid('CIRCULARSTRING(0 2, -1 1,0 0, 0.5 0, 1 0, 2 1, 1 2, 0.5 2, 0 2)'::geometry));
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SELECT 'centroid5', ST_astext(ST_centroid('COMPOUNDCURVE(CIRCULARSTRING(0 2, -1 1,0 0),(0 0, 0.5 0, 1 0),CIRCULARSTRING( 1 0, 2 1, 1 2),(1 2, 0.5 2, 0 2))'::geometry));
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SELECT 'exteriorring', ST_astext(ST_exteriorring(ST_PolygonFromText('POLYGON((52 18,66 23,73 9,48 6,52 18),(59 18,67 18,67 13,59 13,59 18))')));
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SELECT 'polygonize_garray', ST_astext(ST_polygonize('{0102000000020000000000000000000000000000000000000000000000000024400000000000000000:0102000000020000000000000000002440000000000000000000000000000000000000000000000000:0102000000020000000000000000002440000000000000244000000000000000000000000000000000:0102000000020000000000000000002440000000000000244000000000000024400000000000000000:0102000000020000000000000000002440000000000000244000000000000000000000000000002440:0102000000020000000000000000000000000000000000244000000000000000000000000000002440:0102000000020000000000000000000000000000000000244000000000000024400000000000002440:0102000000020000000000000000000000000000000000244000000000000000000000000000000000:0102000000020000000000000000000000000000000000244000000000000024400000000000000000}'::geometry[]));
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SELECT 'polygonize_garray', ST_astext(ST_geometryn(ST_polygonize('{LINESTRING(0 0, 10 0):LINESTRING(10 0, 10 10):LINESTRING(10 10, 0 10):LINESTRING(0 10, 0 0)}'::geometry[]), 1));
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select 'linemerge149', ST_asewkt(ST_linemerge('GEOMETRYCOLLECTION(LINESTRING(0 0, 1 1), LINESTRING(4 4, 1 1), LINESTRING(-5 -5, 0 0))'::geometry));
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--- postgis-devel/2005-December/001784.html
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select 'intersects', ST_intersects(
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ST_polygonfromtext('POLYGON((0.0 0.0,1.0 0.0,1.0 1.0,1.0 0.0,0.0 0.0))'),
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ST_polygonfromtext('POLYGON((0.0 2.0,1.0 2.0,1.0 3.0,0.0 3.0,0.0 2.0))')
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);
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select 'ST_GeometryN', ST_asewkt(ST_GeometryN('LINESTRING(0 0, 1 1)'::geometry, 1));
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select 'ST_NumGeometries', ST_NumGeometries('LINESTRING(0 0, 1 1)'::geometry);
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select 'ST_Union1', ST_AsText(ST_Union(ARRAY['POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))'::geometry, 'POLYGON((0.5 0.5, 1.5 0.5, 1.5 1.5, 0.5 1.5, 0.5 0.5))'::geometry]));
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select 'ST_StartPoint1',ST_AsText(ST_StartPoint('LINESTRING(0 0, 1 1, 2 2)'::geometry));
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select 'ST_EndPoint1', ST_AsText(ST_Endpoint('LINESTRING(0 0, 1 1, 2 2)'::geometry));
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select 'ST_PointN1', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2)'::geometry,2));
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select 'ST_PointN2', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2)'::geometry,3));
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select 'ST_PointN3', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2)'::geometry,4));
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select 'ST_PointN4', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2)'::geometry,0));
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select 'ST_PointN5', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2)'::geometry,1));
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select 'ST_PointN6', ST_AsText(ST_PointN('POLYGON((0 0, 1 1, 0 1, 0 0))'::geometry,1));
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select 'ST_PointN7', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2,3 3, 4 4)'::geometry,-2)); --testing negativ index
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select 'ST_PointN8', ST_AsText(ST_PointN('LINESTRING(0 0, 1 1, 2 2,3 3, 4 4)'::geometry,-6));
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select 'ST_PointN9', ST_AsText(ST_PointN('LINESTRING(0 0 0, 1 1 1,2 2 2,3 3 3,4 4 4)'::geometry,2)); --testing 3D
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-- issues with EMPTY --
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select 'ST_Buffer(empty)', ST_AsText(ST_Buffer('POLYGON EMPTY'::geometry, 0.5));
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