From ef62cc8733684f93cabb4cfae9950dcffb030d0b Mon Sep 17 00:00:00 2001
From: John Truckenbrodt <john.truckenbrodt@uni-jena.de>
Date: Wed, 2 Mar 2022 19:19:17 +0100
Subject: [PATCH] [vector.boundary] fixed bug

---
 spatialist/vector.py | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/spatialist/vector.py b/spatialist/vector.py
index 46273a3..6a0638f 100644
--- a/spatialist/vector.py
+++ b/spatialist/vector.py
@@ -804,11 +804,13 @@ def boundary(vectorobject, expression=None, outname=None):
     major = feat_major.GetGeometryRef()
     
     boundary = major.Boundary()
-    
-    longest = None
-    for line in boundary:
-        if (longest is None) or (line.Length() > longest.Length()):
-            longest = line
+    if boundary.GetGeometryName() == 'LINESTRING':
+        longest = boundary
+    else:  # MULTILINESTRING
+        longest = None
+        for line in boundary:
+            if (longest is None) or (line.Length() > longest.Length()):
+                longest = line
     
     points = longest.GetPoints()
     ring = ogr.Geometry(ogr.wkbLinearRing)