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more examples of TIN and polyhedral surfaces

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git-svn-id: http://svn.osgeo.org/postgis/trunk@6876 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Regina Obe 2011-03-05 06:07:28 +00:00
parent 54e3a46391
commit 244a939935
2 changed files with 70 additions and 10 deletions
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48
doc/reference_accessor.xml
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@ -499,10 +499,9 @@ LINESTRING(0 0 1,1 1 1,1 2 1,1 1 1,0 0 1)
<refsection> <refsection>
<title>Examples</title> <title>Standard Examples</title>
<programlisting> <programlisting>--Extracting a subset of points from a 3d multipoint
--Extracting a subset of points from a 3d multipoint
SELECT n, ST_AsEWKT(ST_GeometryN(the_geom, n)) As geomewkt SELECT n, ST_AsEWKT(ST_GeometryN(the_geom, n)) As geomewkt
FROM ( FROM (
VALUES (ST_GeomFromEWKT('MULTIPOINT(1 2 7, 3 4 7, 5 6 7, 8 9 10)') ), VALUES (ST_GeomFromEWKT('MULTIPOINT(1 2 7, 3 4 7, 5 6 7, 8 9 10)') ),
@ -524,10 +523,47 @@ WHERE n &lt;= ST_NumGeometries(the_geom);
--Extracting all geometries (useful when you want to assign an id) --Extracting all geometries (useful when you want to assign an id)
SELECT gid, n, ST_GeometryN(the_geom, n) SELECT gid, n, ST_GeometryN(the_geom, n)
FROM sometable CROSS JOIN generate_series(1,100) n FROM sometable CROSS JOIN generate_series(1,100) n
WHERE n &lt;= ST_NumGeometries(the_geom); WHERE n &lt;= ST_NumGeometries(the_geom);</programlisting>
</refsection>
<refsection><title>Polyhedral Surfaces, TIN and Triangle Examples</title>
<programlisting>-- Polyhedral surface example
-- Break a Polyhedral surface into its faces
SELECT ST_AsEWKT(ST_GeometryN(p_geom,3)) As geom_ewkt
FROM (SELECT ST_GeomFromEWKT('POLYHEDRALSURFACE(
((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0)),
((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0)),
((0 0 0, 1 0 0, 1 0 1, 0 0 1, 0 0 0)),
((1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0)),
((0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0)),
((0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1))
)') AS p_geom ) AS a;
geom_ewkt
</programlisting> ------------------------------------------
POLYGON((0 0 0,1 0 0,1 0 1,0 0 1,0 0 0))</programlisting>
<programlisting>-- TIN --
SELECT ST_AsEWKT(ST_GeometryN(geom,2)) as wkt
FROM
(SELECT
ST_GeomFromEWKT('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
))
)') AS geom
) AS g;
-- result --
wkt
-------------------------------------
TRIANGLE((0 0 0,0 1 0,1 1 0,0 0 0))</programlisting>
</refsection> </refsection>
<!-- Optionally add a "See Also" section --> <!-- Optionally add a "See Also" section -->

32
doc/reference_processing.xml
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@ -1038,7 +1038,7 @@ MULTIPOINT(-118.6 38.329 6,-118.58 38.38 5)
</refsection> </refsection>
<refsection> <refsection>
<title>Examples</title> <title>Standard Examples</title>
<programlisting>SELECT sometable.field1, sometable.field1, <programlisting>SELECT sometable.field1, sometable.field1,
(ST_Dump(sometable.the_geom)).geom AS the_geom (ST_Dump(sometable.the_geom)).geom AS the_geom
FROM sometable; FROM sometable;
@ -1053,9 +1053,9 @@ SELECT ST_AsEWKT(a.geom), ST_HasArc(a.geom)
CIRCULARSTRING(0 0,1 1,1 0) | t CIRCULARSTRING(0 0,1 1,1 0) | t
LINESTRING(1 0,0 1) | f LINESTRING(1 0,0 1) | f
(2 rows)</programlisting> (2 rows)</programlisting>
</refsection>
<programlisting> <refsection><title>Polyhedral Surfaces, TIN and Triangle Examples</title>
-- Polyhedral surface example <programlisting>-- Polyhedral surface example
-- Break a Polyhedral surface into its faces -- Break a Polyhedral surface into its faces
SELECT (a.p_geom).path[1] As path, ST_AsEWKT((a.p_geom).geom) As geom_ewkt SELECT (a.p_geom).path[1] As path, ST_AsEWKT((a.p_geom).geom) As geom_ewkt
FROM (SELECT ST_Dump(ST_GeomFromEWKT('POLYHEDRALSURFACE( FROM (SELECT ST_Dump(ST_GeomFromEWKT('POLYHEDRALSURFACE(
@ -1072,6 +1072,30 @@ SELECT (a.p_geom).path[1] As path, ST_AsEWKT((a.p_geom).geom) As geom_ewkt
4 | POLYGON((1 1 0,1 1 1,1 0 1,1 0 0,1 1 0)) 4 | POLYGON((1 1 0,1 1 1,1 0 1,1 0 0,1 1 0))
5 | POLYGON((0 1 0,0 1 1,1 1 1,1 1 0,0 1 0)) 5 | POLYGON((0 1 0,0 1 1,1 1 1,1 1 0,0 1 0))
6 | POLYGON((0 0 1,1 0 1,1 1 1,0 1 1,0 0 1))</programlisting> 6 | POLYGON((0 0 1,1 0 1,1 1 1,0 1 1,0 0 1))</programlisting>
<programlisting>-- TIN --
SELECT (g.gdump).path, ST_AsEWKT((g.gdump).geom) as wkt
FROM
(SELECT
ST_Dump( ST_GeomFromEWKT('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
))
)') ) AS gdump
) AS g;
-- result --
path | wkt
------+-------------------------------------
{1} | TRIANGLE((0 0 0,0 0 1,0 1 0,0 0 0))
{2} | TRIANGLE((0 0 0,0 1 0,1 1 0,0 0 0))
</programlisting>
</refsection> </refsection>
<refsection> <refsection>
<title>See Also</title> <title>See Also</title>