From ef16ff831d0dce2ce8a62fa4a55097a433a9fa52 Mon Sep 17 00:00:00 2001
From: hsieyuan <xieyuan@dameng.com>
Date: Fri, 15 Nov 2024 14:45:52 +0800
Subject: [PATCH] Fix issue #1191

Fix the bug in LineString::getPointN, which causes the output point of GEOSGeomGetEndPoint loses the 'm' dimension
---
 src/geom/LineString.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/geom/LineString.cpp b/src/geom/LineString.cpp
index e3c84c3dc8..c7cfa9669d 100644
--- a/src/geom/LineString.cpp
+++ b/src/geom/LineString.cpp
@@ -181,7 +181,12 @@ LineString::getPointN(std::size_t n) const
 {
     assert(getFactory());
     assert(points.get());
-    return std::unique_ptr<Point>(getFactory()->createPoint(points->getAt(n)));
+    if (hasM())
+        return std::unique_ptr<Point>(getFactory()->createPoint(points->getAt<CoordinateXYZM>(n)));
+    else if (hasZ())
+        return std::unique_ptr<Point>(getFactory()->createPoint(points->getAt<Coordinate>(n)));
+    else
+        return std::unique_ptr<Point>(getFactory()->createPoint(points->getAt<CoordinateXY>(n)));
 }
 
 std::unique_ptr<Point>