Update CRS

app.py

@@ -155,11 +155,13 @@ def shape_3d_to_2d(shape):
 
 def preprocess_gdf(gdf):
     gdf["geometry"] = gdf["geometry"].apply(shape_3d_to_2d)
-    epsg_code = find_best_epsg(gdf["geometry"])
-    gdf = gdf.to_crs(epsg=int(epsg_code))  #Find best EPSG code
     gdf["geometry"] = gdf.buffer(0)  # Fixes some invalid geometries
     return gdf
 
+def to_best_crs(gdf):
+    best_epsg_code = find_best_epsg(gdf["geometry"].iloc[0])
+    gdf = gdf.to_crs(epsg=best_epsg_code)
+    return gdf
 
 def is_valid_polygon(geometry_gdf):
     geometry = geometry_gdf.geometry.item()
@@ -420,11 +422,10 @@ if isinstance(file_url, str):
 
 buffer = st.number_input("Buffer (m)", value=50, min_value=0, step=1)
 
-
+input_gdf = preprocess_gdf(gpd.read_file(file_url))
 if len(input_gdf) > 1:
     st.warning(f"Only the first polygon in the KML will be processed; all other geometries will be ignored.")
 
-input_gdf = preprocess_gdf(gpd.read_file(file_url))
 # input_geometry_idx = st.selectbox("Select the geometry", input_gdf.index, format_func=format_fn)
 
 for i in range(len(input_gdf)):
@@ -435,6 +436,7 @@ else:
     st.error(f"No polygon found inside KML. Please check the KML file.")
     st.stop()
 
+geometry_gdf = to_best_crs(geometry_gdf)
 outer_geometry_gdf = geometry_gdf.copy()
 outer_geometry_gdf["geometry"] = outer_geometry_gdf["geometry"].buffer(buffer)
 buffer_geometry_gdf = (