Code Editor for app.py

import streamlit as st
import geopandas as gpd
import pandas as pd
from shapely.geometry import Point, Polygon
import json

st.title("Shapefile to Map Viewer")

# File uploader for shapefile
uploaded_file = st.file_uploader("Choose a Shapefile (.shp)", type=['shp'])

if uploaded_file is not None:
    try:
        # Read the shapefile
        gdf = gpd.read_file(uploaded_file)
        
        # Convert CRS to WGS84 (standard lat/long)
        if gdf.crs is not None and gdf.crs != 'EPSG:4326':
            gdf = gdf.to_crs('EPSG:4326')
        
        # Create a DataFrame with the centroid coordinates
        df_for_map = pd.DataFrame()
        df_for_map['latitude'] = gdf.geometry.centroid.y
        df_for_map['longitude'] = gdf.geometry.centroid.x
        
        # Display the GeoDataFrame info
        st.subheader("Shapefile Information")
        st.write(f"Number of features: {len(gdf)}")
        st.write(f"Coordinate Reference System: {gdf.crs}")
        
        # Display the attribute table
        st.subheader("Attribute Table")
        st.dataframe(gdf.drop('geometry', axis=1))
        
        # Display the map
        st.subheader("Map Visualization")
        st.map(df_for_map)
        
        # Display GeoJSON for debugging
        if st.checkbox("Show GeoJSON"):
            st.json(json.loads(gdf.to_json()))
            
    except Exception as e:
        st.error(f"Error processing shapefile: {str(e)}")
else:
    st.info("Please upload a shapefile (.shp) to begin.")