[postgis-tickets] [SCM] PostGIS branch master updated. 3.1.0rc1-75-g639b2f9

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commit 639b2f9bc23836b5c32cf68c4375a7cca5df6325
Author: Martin Davis <mtnclimb at gmail.com>
Date:   Fri Feb 12 12:24:35 2021 -0800

    Add doc ST_ReducePrecision examples

diff --git a/doc/reference_processing.xml b/doc/reference_processing.xml
index 00a489c..2284c95 100644
--- a/doc/reference_processing.xml
+++ b/doc/reference_processing.xml
@@ -1980,11 +1980,25 @@ SELECT ST_AsText(ST_ReducePrecision('POINT(1.412 19.323)', 1.0));
 -------------
  POINT(1 19)
 
- SELECT ST_AsText(ST_ReducePrecision('POINT(1.412 19.323)', 10));
+SELECT ST_AsText(ST_ReducePrecision('POINT(1.412 19.323)', 10));
   st_astext
 -------------
  POINT(0 20)
 </programlisting>
+
+<para>Precision reduction can reduce number of vertices</para>
+<programlisting>SELECT ST_AsText(ST_ReducePrecision('LINESTRING (10 10, 19.6 30.1, 20 30, 20.3 30, 40 40)', 1));
+  st_astext
+-------------
+ LINESTRING (10 10, 20 30, 40 40)
+</programlisting>
+
+<para>Precision reduction splits polygons if needed to ensure validity</para>
+<programlisting>SELECT ST_AsText(ST_ReducePrecision('POLYGON ((10 10, 60 60.1, 70 30, 40 40, 50 10, 10 10))', 10));
+  st_astext
+-------------
+ MULTIPOLYGON (((60 60, 70 30, 40 40, 60 60)), ((40 40, 50 10, 10 10, 40 40)))
+</programlisting>
       </refsection>
 
       <refsection>

-----------------------------------------------------------------------

Summary of changes:
 doc/reference_processing.xml | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)


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