add data sources

app.py

@@ -27,7 +27,7 @@ fps = st.slider("Frames per second", 0.01, 50.0, 16.0)
 
 show_dt = st.checkbox("Show timestamp", True)
 
-fetch_data = st.checkbox("Fetch new data", False)
+fetch_data = st.checkbox("Refresh data", False)
 
 if st.button("Plot Data"):
     smoke_url = "https://firesmoke.ca/forecasts/current/dispersion.nc"
@@ -94,3 +94,7 @@ if st.button("Plot Data"):
     last_dt = dts[-1]
 
     st.image(buffer, caption=f"{first_dt} to {last_dt}")
+
+    with st.expander("Data Sources"):
+        st.markdown(f"Smoke forecast: [FireSmoke Canada](https://firesmoke.ca/)")
+        st.markdown(f"Administrative boundaries: [Natural Earth, 1:50M Admin 1 – States, provinces](https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/50m/cultural/ne_50m_admin_1_states_provinces.zip)")