allow more than one geometries

app.py

@@ -109,12 +109,9 @@ def preprocess_gdf(gdf):
     return gdf
 
 
-def check_valid_geometry(geometry_gdf):
+def is_valid_polygon(geometry_gdf):
     geometry = geometry_gdf.geometry.item()
-    if geometry.type != "Polygon":
-        st.error(f"Selected geometry is of type '{geometry.type}'. Please provide a 'Polygon' geometry.")
-        st.stop()
-
+    return (geometry.type == "Polygon") and (not geometry.is_empty)
 
 def add_geometry_to_maps(map_list, opacity=0.0):
     for m in map_list:
@@ -372,21 +369,18 @@ 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__)
-
-# Input: Geometry
-def format_fn(x):
-    return input_gdf.drop(columns=["geometry"]).loc[x].to_dict()
-
+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_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)
+
+for i in range(len(input_gdf)):
+    geometry_gdf = input_gdf[input_gdf.index == i]
+    if is_valid_polygon(geometry_gdf):
+        break
+else:
+    st.error(f"No polygon found inside KML. Please check the KML file.")
+    st.stop()
 
 outer_geometry_gdf = geometry_gdf.copy()
 outer_geometry_gdf["geometry"] = outer_geometry_gdf["geometry"].buffer(buffer)