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.geemap.org>
    - GitHub repository: <https://github.com/giswqs/streamlit-geospatial>
    """
)

st.sidebar.title("Contact")
st.sidebar.info(
    """
    Qiusheng Wu: <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)