Update app.py

app.py

@@ -14,14 +14,14 @@ def load_geojson_data(file_paths):
         geodata.append(gdf)
     return geodata
 
-
+# Sample Polygon GeoJSON
 polygon_geojson = json.loads("""
 {
   "type": "FeatureCollection",
   "features": [
     {
       "type": "Feature",
-      "properties": {},
+      "properties": {"density": 10},
       "geometry": {
         "type": "Polygon",
         "coordinates": [[[79.486114,27.577006],[79.5157554,27.5646727],[79.5405574,27.5461701],[79.5695939,27.519081],[79.5756432,27.4938634],[79.5593101,27.4871556],[79.5308786,27.5257868],[79.5003298,27.5319559],[79.4849041,27.5456337],[79.4761327,27.5652089],[79.486114,27.577006]]]
@@ -36,18 +36,34 @@ st.sidebar.title("Geospatial Data Visualization")
 timestamp = st.sidebar.select_slider("Time", options=[f"{year}-01" for year in range(2016, 2024)])
 
 # Main title
-st.title("Heatmap and Polygon view:")
+st.title("Hexagon and Polygon view:")
 
 
-geojson_file_paths = ['kathajodi_centroids.geojson','chambal_centroids.geojson']
+geojson_file_paths = ['chambal_centroids.geojson','kathajodi_centroids.geojson']
 geojson_data = load_geojson_data(geojson_file_paths)
 
-# Combine all geodata into one DataFrame for Pydeck
-all_geo_data = pd.concat(geojson_data + [gpd.GeoDataFrame.from_features(polygon_geojson["features"])])
+
+if geojson_data:
+    all_geo_data = pd.concat(geojson_data + [gpd.GeoDataFrame.from_features(polygon_geojson["features"])])
+else:
+    all_geo_data = gpd.GeoDataFrame.from_features(polygon_geojson["features"])
+
+# Add centroid coordinates to all_geo_data
 all_geo_data['lon'] = all_geo_data.geometry.centroid.x
 all_geo_data['lat'] = all_geo_data.geometry.centroid.y
 
-# Pydeck Layer for Polygons
+# Hexagon Layer
+hexagon_layer = pdk.Layer(
+    "HexagonLayer",
+    all_geo_data,
+    get_position=['lon', 'lat'],
+    elevation_scale=50,
+    radius=2000, 
+    elevation_range=[0, 3000],
+    pickable=True,
+    extruded=True,
+)
+
 polygon_layer = pdk.Layer(
     "PolygonLayer",
     all_geo_data,
@@ -58,37 +74,28 @@ polygon_layer = pdk.Layer(
     auto_highlight=True
 )
 
-# Pydeck Layer for Heatmap
-heatmap_layer = pdk.Layer(
-    "HeatmapLayer",
-    all_geo_data,
-    get_position=['lon', 'lat'],
-    aggregation=pdk.types.String("MEAN"),
-    opacity=0.5
-)
-
-# Set the viewport location
+# Set viewport location
 view_state = pdk.ViewState(
     latitude=27.5,
     longitude=79.5,
     zoom=6,
-    pitch=0
+    pitch=40
 )
 
-# Render the map using Pydeck
+
 r = pdk.Deck(
-    layers=[polygon_layer, heatmap_layer],
+    layers=[hexagon_layer, polygon_layer], 
     initial_view_state=view_state,
     map_style='mapbox://styles/mapbox/satellite-v9'
 )
 
-# Display the map in Streamlit
+
 st.pydeck_chart(r)
 
 # Add an informational box
 with st.expander("View Information"):
     st.write(f"Selected Time: {timestamp}")
     num_points = len(all_geo_data)
-    total_area = all_geo_data.geometry.area.sum()  # Customize as needed.
+    total_area = all_geo_data.geometry.area.sum() 
     st.write(f"Number of Features: {num_points}")
     st.write(f"Total Area: {total_area:.2f} sq km")