[geos-commits] [SCM] GEOS branch main updated. 6354193e908802263057d0ef8dcd3689f6c99a4a

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- Log -----------------------------------------------------------------
commit 6354193e908802263057d0ef8dcd3689f6c99a4a
Author: Daniel Baston <dbaston at gmail.com>
Date:   Thu Jul 9 18:51:56 2026 -0400

    PointGeometryUnion: Avoid dropping M values (#1474)

diff --git a/src/operation/union/PointGeometryUnion.cpp b/src/operation/union/PointGeometryUnion.cpp
index 4ff569957..e997b9aab 100644
--- a/src/operation/union/PointGeometryUnion.cpp
+++ b/src/operation/union/PointGeometryUnion.cpp
@@ -43,7 +43,7 @@ PointGeometryUnion::Union() const
 
     PointLocator locater;
     // use a set to eliminate duplicates, as required for union
-    std::set<Coordinate> exteriorCoords;
+    std::set<CoordinateXYZM> exteriorCoords;
 
     for(std::size_t i = 0, n = pointGeom.getNumGeometries(); i < n; ++i) {
         const Point* point = dynamic_cast<const Point*>(pointGeom.getGeometryN(i));
@@ -53,10 +53,12 @@ PointGeometryUnion::Union() const
             continue;
         }
 
-        const Coordinate* coord = static_cast<const Coordinate*>(point->getCoordinate());
+        const CoordinateXY* coord = point->getCoordinate();
         Location loc = locater.locate(*coord, &otherGeom);
         if(loc == Location::EXTERIOR) {
-            exteriorCoords.insert(*coord);
+            CoordinateXYZM ptZM;
+            point->getCoordinatesRO()->getAt(0, ptZM);
+            exteriorCoords.insert(ptZM);
         }
     }
 
diff --git a/tests/unit/operation/geounion/UnaryUnionOpTest.cpp b/tests/unit/operation/geounion/UnaryUnionOpTest.cpp
index 9f2023e39..e849daa93 100644
--- a/tests/unit/operation/geounion/UnaryUnionOpTest.cpp
+++ b/tests/unit/operation/geounion/UnaryUnionOpTest.cpp
@@ -76,7 +76,7 @@ struct test_unaryuniontest_data {
         using std::endl;
         GeomPtr a2 = normalize(a);
         GeomPtr b2 = normalize(b);
-        bool eq = a2->equalsExact(b2.get());
+        bool eq = a2->equalsIdentical(b2.get());
         if(! eq) {
             cout << "EXPECTED: " << wktwriter.write(a2.get()) << endl;
             cout << "OBTAINED: " << wktwriter.write(b2.get()) << endl;
@@ -206,5 +206,19 @@ void object::test<7>
     doTest(geoms, "LINESTRING EMPTY");
 }
 
+template<>
+template<>
+void object::test<8>() {
+    static char const* const geoms[] = {
+        "POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0))",
+        "POINT M (12 13 14)",
+        "POINT Z (12 13 8)",
+        "POINT M (12 13 16)",
+        nullptr
+    };
+
+    doTest(geoms, "GEOMETRYCOLLECTION (POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0)), POINT M (12 13 14))");
+}
+
 } // namespace tut
 

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

Summary of changes:
 src/operation/union/PointGeometryUnion.cpp         |  8 +++++---
 tests/unit/operation/geounion/UnaryUnionOpTest.cpp | 16 +++++++++++++++-
 2 files changed, 20 insertions(+), 4 deletions(-)


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