Update app.py

app.py

@@ -122,7 +122,19 @@ if uploaded_file is not None:
     nc = gpd.read_file("N_FLD_HAZ_AR.shp")
     sussex = gpd.read_file("S_FLD_HAZ_AR.shp")
     dela = gpd.GeoDataFrame(pd.concat([kent, nc, sussex], ignore_index=True))
-    dela = dela.set_crs(kent.crs, allow_override=True).to_crs(epsg=3857)
+
+    # First, check if the shapefile already has a CRS
+    if dela.crs is None:
+        # Set the CRS for the shapefile if it doesn't have one
+        dela = dela.set_crs("EPSG:4326", allow_override=True)
+    else:
+        # If the shapefile already has a CRS, make sure it's in the same CRS
+        dela = dela.to_crs("EPSG:4326")
+
+    # Reproject to Web Mercator (EPSG:3857)
+    dela = dela.to_crs(epsg=3857)
+
+    # Ensure valid geometries
     dela['geometry'] = dela['geometry'].apply(lambda x: x.buffer(0) if not x.is_valid else x)
 
     # Process uploaded KML/KMZ