[SCM] PostGIS branch master updated. 3.6.0rc2-622-gc451c27eb

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- Log -----------------------------------------------------------------
commit c451c27eb8cd4e52d66e281f1178d0b542d6be1a
Author: Darafei Praliaskouski <me at komzpa.net>
Date:   Fri Jun 19 23:02:04 2026 +0400

    doc: document ST_AsMVTGeom tile-coordinate simplification
    
    Clarify that ST_AsMVTGeom simplifies only within tile coordinate space by snapping to the integer grid, removing repeated points, and removing collinear points after transformation. Direct callers to run explicit map-coordinate simplification before tile conversion when they need broader detail reduction.
    
    Closes #6022
    
    Closes https://github.com/postgis/postgis/pull/983

diff --git a/NEWS b/NEWS
index 0788a58d2..0190bff69 100644
--- a/NEWS
+++ b/NEWS
@@ -43,6 +43,7 @@ To take advantage of all postgis_sfcgal extension features SFCGAL 2.3+ is needed
  - #5109, Document the meaning of topology.next_left_edge and topology.next_right_edge links (Darafei Praliaskouski)
  - #5889, [topology] Include representative locations in topology build errors (Darafei Praliaskouski)
  - #2614, Use GEOSPreparedDistance and caching to accelerate ST_DWithin (Paul Ramsey)
+ - #6022, Document ST_AsMVTGeom tile-coordinate simplification (Darafei Praliaskouski)
  - GH-839, ST_Multi support for TIN and surfaces (Loïc Bartoletti)
  - #4398, Add ST_CatmullSmoothing smoothes but retains original vertices (Paul Ramsey)
  - #4560, ST_3DInterpolatePoint for M interpolation from XYZ inputs (Paul Ramsey)
diff --git a/doc/reference_output.xml b/doc/reference_output.xml
index f09888e38..7ab16f862 100644
--- a/doc/reference_output.xml
+++ b/doc/reference_output.xml
@@ -1364,6 +1364,14 @@ SELECT (ST_AsLatLonText('POINT (-302.2342342 -792.32498)'));
     <para>The function attempts to preserve geometry validity, and corrects it if needed.
         This may cause the result geometry to collapse to a lower dimension.
     </para>
+    <para>The function performs geometry simplification appropriate to the
+        integer tile coordinate space. After transforming to tile coordinates
+        it snaps coordinates to the integer grid, removes repeated points, and
+        removes points that lie on straight lines. It does not perform
+        general-purpose, scale-dependent simplification such as
+        <xref linkend="ST_Simplify"/>. To reduce detail before tile conversion,
+        simplify the geometry in map coordinates before calling
+        <function>ST_AsMVTGeom</function>.</para>
         <para>The rectangular bounds of the tile in the target map coordinate space must be provided,
         so the geometry can be transformed, and clipped if required.
         The bounds can be generated using <xref linkend="ST_TileEnvelope"/>.

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

Summary of changes:
 NEWS                     | 1 +
 doc/reference_output.xml | 8 ++++++++
 2 files changed, 9 insertions(+)


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