app.py

import streamlit as st
import pydeck as pdk
import geopandas as gpd
import pandas as pd


@st.cache_data
def load_geojson_data(file_paths):
    geodata = []
    for path in file_paths:
        gdf = gpd.read_file(path)
        gdf['lon'] = gdf.geometry.x
        gdf['lat'] = gdf.geometry.y
        geodata.append(gdf)
    return geodata

st.sidebar.title("Geospatial Data Visualization")
timestamp = st.sidebar.select_slider("Time", options=[f"{year}-01" for year in range(2016, 2024)])


st.title("Geospatial Data Visualization")


geojson_file_paths = ['kathajodi_centroids.geojson','chambal_centroids.geojson']


geojson_data = load_geojson_data(geojson_file_paths)


all_geo_data = pd.concat(geojson_data)
all_geo_data['lon'] = all_geo_data.geometry.x
all_geo_data['lat'] = all_geo_data.geometry.y


if 'view_state' not in st.session_state:
    st.session_state.view_state = pdk.ViewState(
        latitude=all_geo_data['lat'].mean(),
        longitude=all_geo_data['lon'].mean(),
        zoom=10,
        pitch=45,
        bearing=0
    )


tab1, tab2 = st.tabs(["Heatmap", "3D Hexagon Plot"])


with tab1:
    st.subheader("Heatmap View")
    
    # Pydeck HeatmapLayer for Points
    heatmap_layer = pdk.Layer(
        "HeatmapLayer",
        all_geo_data,
        get_position=['lon', 'lat'],
        aggregation=pdk.types.String("MEAN"),
        opacity=0.5
    )

    r = pdk.Deck(
        layers=[heatmap_layer],
        initial_view_state=st.session_state.view_state,
        map_style='mapbox://styles/mapbox/satellite-v9'
    )


    st.session_state.view_state = r.initial_view_state


    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)
        st.write(f"Number of Features: {num_points}")

# 3D Hexagon Plot Tab
with tab2:
    st.subheader("3D Hexagon Map View")
    
    
    hexagon_layer = pdk.Layer(
        "HexagonLayer",
        all_geo_data,
        get_position=['lon', 'lat'],
        radius=1000,  
        elevation_scale=20,  
        elevation_range=[0, 1000], 
        extruded=True,  
        coverage=1,  
        pickable=True
    )

    
    r = pdk.Deck(
        layers=[hexagon_layer],
        initial_view_state=st.session_state.view_state,
        map_style='mapbox://styles/mapbox/satellite-v9'
    )

    
    st.session_state.view_state = r.initial_view_state

    
    st.pydeck_chart(r)

    # Add informational box
    with st.expander("View Information"):
        st.write(f"Selected Time: {timestamp}")
        num_points = len(all_geo_data)
        st.write(f"Number of Features: {num_points}")