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Added ST_3DShortestLine in doc and some small editing. ST_3DLongestLine is still missing.
Regina, please take a look if it looks ok. git-svn-id: http://svn.osgeo.org/postgis/trunk@6607 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Nicklas Avén
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08686b226c
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@ -6,7 +6,7 @@
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<refname>ST_3DClosestPoint</refname>
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<refpurpose>Returns the 3-dimensional point on g1 that is closest to g2. This is the first point of
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the shortest line. </refpurpose>
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the 3D shortest line. </refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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@ -27,7 +27,7 @@
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<title>Description</title>
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<para>Returns the 3-dimensional point on g1 that is closest to g2. This is the first point of
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the shortest line. The length of the shortest line is the 3D distance.
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the 3D shortest line. The 3D length of the 3D shortest line is the 3D distance.
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</para>
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<para>&Z_support;</para>
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<para>Availability: 2.0.0</para>
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@ -91,7 +91,7 @@ SELECT ST_AsEWKT(ST_3DClosestPoint(line,pt)) AS cp3d_line_pt,
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<refsection>
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<title>See Also</title>
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<para><xref linkend="ST_AsEWKT" />, <xref linkend="ST_ClosestPoint"/>,, <xref linkend="ST_3DDistance"/></para>
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<para><xref linkend="ST_AsEWKT" />, <xref linkend="ST_ClosestPoint"/>,<xref linkend="ST_3DDistance"/>,<xref linkend="ST_3DShortestLine"/></para>
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</refsection>
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</refentry>
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<refentry id="ST_3DDistance">
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@ -163,7 +163,7 @@ SELECT ST_3DDistance(poly, mline) As dist3d,
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<refsection>
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<title>See Also</title>
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<para><xref linkend="ST_Distance"/>,<xref linkend="ST_3DClosestPoint"/>,<xref linkend="ST_3DDWithin"/>,<xref linkend="ST_3DMaxDistance" />, <xref linkend="ST_Transform" /></para>
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<para><xref linkend="ST_Distance"/>,<xref linkend="ST_3DClosestPoint"/>,<xref linkend="ST_3DDWithin"/>,<xref linkend="ST_3DMaxDistance" />, <xref linkend="ST_3DShortestLine"/>,<xref linkend="ST_Transform" /></para>
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</refsection>
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</refentry>
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@ -415,6 +415,104 @@ SELECT ST_3DMaxDistance(
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<para><xref linkend="ST_Distance"/>,<xref linkend="ST_3DDWithin"/>,<xref linkend="ST_3DMaxDistance" />, <xref linkend="ST_Transform" /></para>
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</refsection>
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</refentry>
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<refentry id="ST_3DShortestLine">
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<refnamediv>
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<refname>ST_3DShortestLine</refname>
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<refpurpose>Returns the 3-dimensional shortest line between two geometries</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>geometry <function>ST_3DShortestLine</function></funcdef>
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<paramdef><type>geometry </type>
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<parameter>g1</parameter></paramdef>
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<paramdef><type>geometry </type>
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<parameter>g2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsection>
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<title>Description</title>
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<para>Returns the 3-dimensional shortest line between two geometries. The function will
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only return the first shortest line if more than one, that the function finds.
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If g1 and g2 intersects in just one point the function will return a line with both start
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and end in that intersection-point.
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If g1 and g2 are intersecting with more than one point the function will return a line with start
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and end in the same point but it can be any of the intersecting points.
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The line returned will always start in g1 and end in g2.
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The 3D length of the line this function returns will always be the same as st_3DDistance returns for g1 and g2.
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</para>
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<para>Availability: 2.0.0</para>
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</refsection>
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<refsection>
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<title>Examples</title>
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<informaltable>
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<tgroup cols="1">
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<tbody>
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<row>
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<entry><para>linestring and point -- both 3d and 2d shortest line
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<programlisting>
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SELECT ST_AsEWKT(ST_3DShortestLine(line,pt)) AS shl3d_line_pt,
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ST_AsEWKT(ST_ShortestLine(line,pt)) As shl2d_line_pt
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FROM (SELECT 'POINT(100 100 30)'::geometry As pt,
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'LINESTRING (20 80 20, 98 190 1, 110 180 3, 50 75 1000)'::geometry As line
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) As foo;
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shl3d_line_pt | shl2d_line_pt
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-----------------------------------------------------------+------------------------------------------
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LINESTRING(54.6993798867619 128.935022917228 11.5475869506606,100 100 30) | LINESTRING(73.0769230769231 115.384615384615,100 100)
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</programlisting>
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</para></entry>
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</row>
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<row>
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<entry><para>linestring and multipoint -- both 3d and 2d shortest line
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<programlisting>SELECT ST_AsEWKT(ST_3DShortestLine(line,pt)) AS shl3d_line_pt,
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ST_AsEWKT(ST_ShortestLine(line,pt)) As shl2d_line_pt
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FROM (SELECT 'MULTIPOINT(100 100 30, 50 74 1000)'::geometry As pt,
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'LINESTRING (20 80 20, 98 190 1, 110 180 3, 50 75 900)'::geometry As line
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) As foo;
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shl3d_line_pt | shl2d_line_pt
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-----------------------------------------------------------+--------------
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LINESTRING(54.6993798867619 128.935022917228 11.5475869506606,100 100 30) | LINESTRING(50 75,50 74)
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</programlisting>
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</para></entry>
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</row>
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<row>
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<entry><para>Multilinestring and polygon both 3d and 2d closest point
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<programlisting>SELECT ST_AsEWKT(ST_3DShortestLine(poly, mline)) As shl3d,
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ST_AsEWKT(ST_ShortestLine(poly, mline)) As shl2d
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FROM (SELECT ST_GeomFromEWKT('POLYGON((175 150 5, 20 40 5, 35 45 5, 50 60 5, 100 100 5, 175 150 5))') As poly,
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ST_GeomFromEWKT('MULTILINESTRING((175 155 2, 20 40 20, 50 60 -2, 125 100 1, 175 155 1),
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(1 10 2, 5 20 1))') As mline ) As foo;
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shl3d | shl2d
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-------------------------------------------+--------------
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LINESTRING(39.993580415989 54.1889925532825 5,40.4078575708294 53.6052383805529 5.03423778139177) | LINESTRING(20 40,20 40)
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</programlisting>
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</para></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsection>
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<refsection>
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<title>See Also</title>
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<para><xref linkend="ST_3DClosestPoint"/>, <xref linkend="ST_3DDistance"/>, <xref linkend="ST_LongestLine"/>, <xref linkend="ST_ShortestLine"/>, <xref linkend="ST_3DMaxDistance"/></para>
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</refsection>
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</refentry>
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<refentry id="ST_Area">
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<refnamediv>
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<refname>ST_Area</refname>
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@ -3539,7 +3637,7 @@ SELECT ST_AsText(
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<refsection>
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<title>See Also</title>
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<para><xref linkend="ST_ClosestPoint"/>, <xref linkend="ST_Distance"/>, <xref linkend="ST_LongestLine"/>, <xref linkend="ST_ShortestLine"/>, <xref linkend="ST_MaxDistance"/></para>
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<para><xref linkend="ST_ClosestPoint"/>, <xref linkend="ST_Distance"/>, <xref linkend="ST_LongestLine"/>, <xref linkend="ST_MaxDistance"/></para>
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</refsection>
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</refentry>
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