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app.py

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+import streamlit as st
+import folium
+from streamlit_folium import folium_static
+import requests
+import json
+import geopandas as gpd
+
+st.set_page_config(page_title="No Fly Zones Map", layout="wide")
+
+@st.cache_data
+def fetch_data():
+    url = "https://esua.cad.gov.hk/web/droneMap/getData"
+    try:
+        response = requests.get(url)
+        response.raise_for_status()
+        return response.json()  # Directly parse JSON response
+    except requests.RequestException as e:
+        st.error(f"Error fetching data: {e}")
+        return None
+
+
+def parse_json_data(json_data):
+    geojson_list = []
+
+    try:
+        # Extract the list of GeoJSON features from the JSON data
+        rfz_features = json_data.get('data', {}).get('rfzFeatures', [])
+        for feature_str in rfz_features:
+            try:
+                geojson = json.loads(feature_str)  # Parse the GeoJSON string
+                geojson_list.append(geojson)
+            except json.JSONDecodeError as e:
+                st.warning(f"Could not parse GeoJSON from feature: {feature_str[:100]}... Error: {e}")
+
+    except Exception as e:
+        st.error(f"Error processing JSON data: {e}")
+
+    return geojson_list
+
+
+def main():
+    st.subheader("Restricted Flying Zones (“RFZ”) from Civil Aviation Department")
+    # Fetch data
+    with st.spinner("Fetching data..."):
+        json_data = fetch_data()
+
+    if json_data:
+        geojson_list = parse_json_data(json_data)
+
+        if geojson_list:
+            m = folium.Map(location=[22.3193, 114.1694], zoom_start=11,
+                       tiles='https://landsd.azure-api.net/dev/osm/xyz/basemap/gs/WGS84/tile/{z}/{x}/{y}.png?key=f4d3e21d4fc14954a1d5930d4dde3809',
+                       attr="Map information from Lands Department")
+
+            folium.TileLayer(
+                tiles='https://mapapi.geodata.gov.hk/gs/api/v1.0.0/xyz/label/hk/en/wgs84/{z}/{x}/{y}.png',
+                attr="Map Map information from Lands Department"
+            ).add_to(m)
+
+            for geojson in geojson_list:
+                gdf = gpd.GeoDataFrame.from_features(geojson['features'])
+
+                # Set the CRS to EPSG:4326 (WGS 84)
+                gdf.set_crs(epsg=4326, inplace=True)
+
+                folium.GeoJson(
+                    gdf,
+                    style_function=lambda feature: {
+                        'fillColor': 'red',
+                        'color': 'black',
+                        'weight': 2,
+                        'fillOpacity': 0.3,
+                    },
+                    tooltip=folium.GeoJsonTooltip(fields=['name'], aliases=['Name'], localize=True)
+                ).add_to(m)
+
+            folium_static(m, width=1200, height=800)
+        else:
+            st.error("No valid GeoJSON data found in the response.")
+    else:
+        st.error("Failed to fetch data. Please try again later.")
+    st.write("Restricted Flying Zones (“RFZ”) reflected in this drone map are designated by the Small Unmanned Aircraft Order (Cap. 448G). In connection to other restricted areas/ zones under other legislation or regulation such as the Air Navigation (Flight Prohibition) Order (Cap. 448E), users should refer to other maps for information.")
+
+if __name__ == "__main__":
+    main()

requirements.txt

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+folium==0.17.0
+geopandas==1.0.1
+Requests==2.32.3
+streamlit==1.37.1
+streamlit_folium==0.22.0