From 955270514d3c978dfea576685160db5f8b0131da Mon Sep 17 00:00:00 2001
From: Kyle Barron <kyle@developmentseed.org>
Date: Mon, 14 Oct 2024 15:15:37 -0400
Subject: [PATCH] Fix geo-types empty Polygon

---
 geo-traits/src/polygon.rs | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/geo-traits/src/polygon.rs b/geo-traits/src/polygon.rs
index 82e9e7c9c..84c6f8bfd 100644
--- a/geo-traits/src/polygon.rs
+++ b/geo-traits/src/polygon.rs
@@ -61,8 +61,12 @@ impl<T: CoordNum> PolygonTrait for Polygon<T> {
     }
 
     fn exterior(&self) -> Option<Self::RingType<'_>> {
-        // geo-types doesn't really have a way to describe an empty polygon
-        Some(Polygon::exterior(self))
+        let ext_ring = Polygon::exterior(self);
+        if ext_ring.num_points() == 0 {
+            None
+        } else {
+            Some(ext_ring)
+        }
     }
 
     fn num_interiors(&self) -> usize {
@@ -84,8 +88,12 @@ impl<'a, T: CoordNum> PolygonTrait for &'a Polygon<T> {
     }
 
     fn exterior(&self) -> Option<Self::RingType<'_>> {
-        // geo-types doesn't really have a way to describe an empty polygon
-        Some(Polygon::exterior(self))
+        let ext_ring = Polygon::exterior(self);
+        if ext_ring.num_points() == 0 {
+            None
+        } else {
+            Some(ext_ring)
+        }
     }
 
     fn num_interiors(&self) -> usize {