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import streamlit as st
import pandas as pd
import pydeck as pdk
from urllib.error import URLError
st.set_page_config(page_title="Mapping Demo", page_icon="🌍")
st.markdown("# Mapping Demo")
st.sidebar.header("Mapping Demo")
st.write(
"""This demo shows how to use
[`st.pydeck_chart`](https://docs.streamlit.io/library/api-reference/charts/st.pydeck_chart)
to display geospatial data."""
)
@st.cache_data
def from_data_file(filename):
url = (
"http://raw.githubusercontent.com/streamlit/"
"example-data/master/hello/v1/%s" % filename
)
return pd.read_json(url)
try:
ALL_LAYERS = {
"Bike Rentals": pdk.Layer(
"HexagonLayer",
data=from_data_file("bike_rental_stats.json"),
get_position=["lon", "lat"],
radius=200,
elevation_scale=4,
elevation_range=[0, 1000],
extruded=True,
),
"Bart Stop Exits": pdk.Layer(
"ScatterplotLayer",
data=from_data_file("bart_stop_stats.json"),
get_position=["lon", "lat"],
get_color=[200, 30, 0, 160],
get_radius="[exits]",
radius_scale=0.05,
),
"Bart Stop Names": pdk.Layer(
"TextLayer",
data=from_data_file("bart_stop_stats.json"),
get_position=["lon", "lat"],
get_text="name",
get_color=[0, 0, 0, 200],
get_size=15,
get_alignment_baseline="'bottom'",
),
"Outbound Flow": pdk.Layer(
"ArcLayer",
data=from_data_file("bart_path_stats.json"),
get_source_position=["lon", "lat"],
get_target_position=["lon2", "lat2"],
get_source_color=[200, 30, 0, 160],
get_target_color=[200, 30, 0, 160],
auto_highlight=True,
width_scale=0.0001,
get_width="outbound",
width_min_pixels=3,
width_max_pixels=30,
),
}
st.sidebar.markdown("### Map Layers")
selected_layers = [
layer
for layer_name, layer in ALL_LAYERS.items()
if st.sidebar.checkbox(layer_name, True)
]
if selected_layers:
st.pydeck_chart(
pdk.Deck(
map_style="mapbox://styles/mapbox/light-v9",
initial_view_state={
"latitude": 37.76,
"longitude": -122.4,
"zoom": 11,
"pitch": 50,
},
layers=selected_layers,
)
)
else:
st.error("Please choose at least one layer above.")
except URLError as e:
st.error(
"""
**This demo requires internet access.**
Connection error: %s
"""
% e.reason
) |