app.py

import streamlit as st #import streamlit to build an app
import ibis #import ibis to run python package
from ibis import _
con = ibis.duckdb.connect()

st.title("Exploring Redlining in the USA") #website title

option = st.selectbox(
    "Pick a city:",
    ("Oakland", "San Francisco", "Chicago"),
    index = 1,
    placeholder = "Select a city",
)

redlines = con.read_geo("/vsicurl/https://dsl.richmond.edu/panorama/redlining/static/mappinginequality.gpkg")

city = redlines.filter(_.city == option)

city_gdf = city.execute() # convert city into a gdf

st.write("You selected:", option)

import leafmap.maplibregl as leafmap
m = leafmap.Map(style = "voyager")
m.add_gdf(city_gdf)
m.add_gdf(city_gdf, "fill",  paint = { "fill-color": ["get", "fill"], "fill-opacity": 0.8})
m.to_streamlit()