[postgis-tickets] [SCM] PostGIS branch master updated. 3.1.0rc1-193-gc815ecd

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- Log -----------------------------------------------------------------
commit c815ecd7d2d59fc362f39c9adfd99b01d12aea89
Author: Martin Davis <mtnclimb at gmail.com>
Date:   Fri May 21 13:14:11 2021 -0700

    More doc hul function changes

diff --git a/doc/reference_processing.xml b/doc/reference_processing.xml
index dfbeb5f..928f968 100644
--- a/doc/reference_processing.xml
+++ b/doc/reference_processing.xml
@@ -628,20 +628,20 @@ POINT(0.5 1)
 
       <refsection>
         <title>Description</title>
-            <para>The concave hull of a geometry represents a possibly concave
+            <para>A concave hull of a geometry represents a possibly concave
         geometry that encloses the input geometry.
         The result is a single polygon, line or point.
         It will not contain holes unless the optional <varname>allow_holes</varname> argument is specified as true.
         </para>
 
-        <para>One can think of the concave hull as the geometry you get by vacuum sealing a set of geometries.
-        This is different from a convex hull which is more like wrapping a rubber band around the set of geometries.
-        It is slower to compute than the convex hull but generally has a smaller result area
-        and represents a more natural bounds of the input geometry.</para>
+        <para>One can think of a concave hull as a geometry obtained by "shrink-wrapping" a set of geometries.
+        This is different to the convex hull, which is more like wrapping a rubber band around the geometries.
+        It is slower to compute than the convex hull but generally has a smaller area
+        and represents a more natural boundary for the input geometry.</para>
 
-        <para>The <varname>target_percent</varname> is the percentage of area of the convex hull the solution will try to approach.
-        A target_percent of 1 will give the same answer as the convex hull.  A target_percent
-        between 0 and 0.99 will produce a geometry that should have a smaller area than the convex hull.
+        <para>The <varname>target_percent</varname> is the percentage of area of the convex hull the solution tries to approach.
+        A target_percent of 1 gives the same result as the convex hull.  A target_percent
+        between 0 and 0.99 produces a result that should have a smaller area than the convex hull.
         </para>
 
         <note><para>The smaller the target percent, the longer it takes to process the concave hull, and the more likely to run into topological exceptions. Also the more
@@ -840,6 +840,12 @@ SELECT ST_ConcaveHull(ST_GeomFromText('MULTILINESTRING((106 164,30 112,74 70,82
         The convex hull is the smallest convex
         geometry that encloses all geometries in the input.</para>
 
+        <para>One can think of the convex hull as the geometry obtained by wrapping an rubber
+            band around a set of geometries.  This is different from a concave hull
+            which is analogous to "shrink-wrapping" the geometries.
+            A convex hull is often used to
+            determine an affected area based on a set of point observations.</para>
+
         <para>In the general case the convex hull is a Polygon.
         The convex hull of two or more collinear points is a two-point LineString.
         The convex hull of one or more identical points is a Point.</para>
@@ -849,12 +855,6 @@ SELECT ST_ConcaveHull(ST_GeomFromText('MULTILINESTRING((106 164,30 112,74 70,82
         to aggregate them into a geometry collection
         (e.g. <code>ST_ConvexHull(ST_Collect(geom))</code>.</para>
 
-        <para>One can think of the convex hull as the geometry obtained by wrapping an elastic
-            band around a set of geometries.  This is different from a concave hull
-            which is analogous to "shrink-wrapping" the geometries.
-            A convex hull is often used to
-            determine an affected area based on a set of point observations.</para>
-
         <para>Performed by the GEOS module</para>
 
         <para>&sfs_compliant; s2.1.1.3</para>

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

Summary of changes:
 doc/reference_processing.xml | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)


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