restrict to one polygon

app.py

@@ -342,6 +342,9 @@ 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.error(f"Expecting only one geometry per KML, but found {len(input_gdf)} geometries. Please fix the KML or provide another KML.")
+    st.stop()
 # print(input_gdf.is_valid)
 # print(gpd.read_file(file_url).is_valid)
 # print(input_gdf.iloc[0].geometry.__geo_interface__)
@@ -351,8 +354,8 @@ def format_fn(x):
     return input_gdf.drop(columns=["geometry"]).loc[x].to_dict()
 
 
-input_geometry_idx = st.selectbox("Select the geometry", input_gdf.index, format_func=format_fn)
-geometry_gdf = input_gdf[input_gdf.index == input_geometry_idx]
+# input_geometry_idx = st.selectbox("Select the geometry", input_gdf.index, format_func=format_fn)
+geometry_gdf = input_gdf[input_gdf.index == 0]
 check_valid_geometry(geometry_gdf)
 
 outer_geometry_gdf = geometry_gdf.copy()