pages/13_🏘️_Global_Building_Footprints.py

import ee
import geemap.foliumap as geemap
import geopandas as gpd
import streamlit as st

st.set_page_config(layout="wide")


@st.cache(persist=True)
def ee_authenticate(token_name="EARTHENGINE_TOKEN"):
    geemap.ee_initialize(token_name=token_name)


st.sidebar.info(
    """
    - Web App URL: <https://streamlit.gishub.org>
    - GitHub repository: <https://github.com/giswqs/streamlit-geospatial>
    """
)

st.sidebar.title("Contact")
st.sidebar.info(
    """
    Qiusheng Wu at [wetlands.io](https://wetlands.io) | [GitHub](https://github.com/giswqs) | [Twitter](https://twitter.com/giswqs) | [YouTube](https://www.youtube.com/c/QiushengWu) | [LinkedIn](https://www.linkedin.com/in/qiushengwu)
    """
)

st.title("Global Building Footprints")

col1, col2 = st.columns([8, 2])


@st.cache_data
def read_data(url):
    return gpd.read_file(url)


countries = (
    "https://github.com/giswqs/geemap/raw/master/examples/data/countries.geojson"
)
states = "https://github.com/giswqs/geemap/raw/master/examples/data/us_states.json"

countries_gdf = read_data(countries)
states_gdf = read_data(states)

country_names = countries_gdf["NAME"].values.tolist()
country_names.remove("United States of America")
country_names.append("USA")
country_names.sort()
country_names = [name.replace(".", "").replace(" ", "_") for name in country_names]

state_names = states_gdf["name"].values.tolist()

basemaps = list(geemap.basemaps)

Map = geemap.Map()

with col2:

    basemap = st.selectbox("Select a basemap", basemaps, index=basemaps.index("HYBRID"))
    Map.add_basemap(basemap)

    country = st.selectbox(
        "Select a country", country_names, index=country_names.index("USA")
    )

    if country == "USA":
        state = st.selectbox(
            "Select a state", state_names, index=state_names.index("Florida")
        )
        layer_name = state

        try:
            fc = ee.FeatureCollection(
                f"projects/sat-io/open-datasets/MSBuildings/US/{state}"
            )
        except:
            st.error("No data available for the selected state.")

    else:
        try:
            fc = ee.FeatureCollection(
                f"projects/sat-io/open-datasets/MSBuildings/{country}"
            )
        except:
            st.error("No data available for the selected country.")

        layer_name = country

    color = st.color_picker("Select a color", "#FF5500")

    style = {"fillColor": "00000000", "color": color}

    split = st.checkbox("Split-panel map")

    if split:
        left = geemap.ee_tile_layer(fc.style(**style), {}, "Left")
        right = left
        Map.split_map(left, right)
    else:
        Map.addLayer(fc.style(**style), {}, layer_name)

    Map.centerObject(fc.first(), zoom=16)

    with st.expander("Data Sources"):
        st.info(
            """
            [Microsoft Building Footprints](https://gee-community-catalog.org/projects/msbuildings/)
            """
        )


with col1:

    Map.to_streamlit(height=1000)