diff --git a/python_scripts/add_trees_to_open_street_map/add_trees.py b/python_scripts/add_trees_to_open_street_map/add_trees.py
index 070b449ee2d856381f27f05f995680231926074a..00a45e8129bc9ce43b231ef7419e10b1aa4526a1 100644
--- a/python_scripts/add_trees_to_open_street_map/add_trees.py
+++ b/python_scripts/add_trees_to_open_street_map/add_trees.py
@@ -10,6 +10,7 @@ import pickle
 from pathlib import Path
 from collections import namedtuple, Counter
 import re
+import math
 
 import folium
 import matplotlib.pyplot as plt
@@ -31,9 +32,9 @@ from import_existing_trees import get_existing_forest
 # TODO: Write tests?
 
 # From RegionChooser, or https://transfer.hft-stuttgart.de/gitlab/circulargreensimcity/circulargreensimcity/-/wikis/Fallstudien/Gromb%C3%BChl
-# WKT = "POLYGON((9.947021 49.803063, 9.947011 49.800917, 9.955025 49.800810, 9.955110 49.803019, 9.947021 49.803063))"
+WKT = "POLYGON((9.947021 49.803063, 9.947011 49.800917, 9.955025 49.800810, 9.955110 49.803019, 9.947021 49.803063))"
 # Grafenbühl
-WKT = "POLYGON((9.147551 48.908059, 9.148635 48.907953, 9.149525 48.907819, 9.151177 48.907819, 9.151413 48.907840, 9.153226 48.908087, 9.153387 48.906705, 9.149160 48.906634, 9.148999 48.906620, 9.147551 48.908059))"
+# WKT = "POLYGON((9.147551 48.908059, 9.148635 48.907953, 9.149525 48.907819, 9.151177 48.907819, 9.151413 48.907840, 9.153226 48.908087, 9.153387 48.906705, 9.149160 48.906634, 9.148999 48.906620, 9.147551 48.908059))"
 # Replace with None if no existing tree should be imported
 EXISTING_TREES = 'existing_trees/Trees_ideal_2_20240227.shp'
 # EXISTING_TREES = 'existing_trees/baumkataster/Baum.shp'
@@ -49,9 +50,9 @@ GRID = 100  # [m]
 # Set to -1 if you want to disable trees along the roads
 DEFAULT_WIDTHS = {
     'unclassified': 0,
-#   'residential': 8,
-#   'motorway': -1,
-#   'trunk': -1,
+    #   'residential': 8,
+    #   'motorway': -1,
+    #   'trunk': -1,
 }
 
 
@@ -185,9 +186,9 @@ def place_trees(forest: Forest, ways: list, region: str, to_local, tree_distance
                                             color='#DFFF00',
                                             type='Fake Tree',
                                             description='Tilia tomentosa',
-                                            diameter=6,
-                                            height=10,
-                                            trunk_diameter=0.5,
+                                            diameter=6, # [m]
+                                            height=10, # [m]
+                                            trunk_diameter=50, # [cm]
                                             source='add_trees.py'
                                             )
 
@@ -262,8 +263,7 @@ def export_shapefile(bounds: Bounds, forest: Forest, epsg_id: int) -> None:
         'x': t.x, 'y': t.y,
         'Bezeichnun': t.description, 'Baumart': t.type,
         'Baumhöhe': t.height, 'Kronenbrei': t.diameter,
-        # FIXME: Stammumfan: trunk_diameter is wrong
-        'Stammumfan': t.trunk_diameter, 'Quelle': t.source
+        'Stammumfan': t.trunk_diameter * math.pi, 'Quelle': t.source
     }
         for t in forest]