pages/11_🧱_Ordnance_Survey.py

import folium
import pandas as pd
import streamlit as st
import leafmap.foliumap as leafmap
import folium.plugins as plugins

st.set_page_config(layout="wide")

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("National Library of Scotland XYZ Layers")
df = pd.read_csv("data/scotland_xyz.tsv", sep="\t")
basemaps = leafmap.basemaps
names = df["Name"].values.tolist() + list(basemaps.keys())
links = df["URL"].values.tolist() + list(basemaps.values())

col1, col2, col3, col4, col5, col6, col7 = st.columns([3, 3, 1, 1, 1, 1.5, 1.5])
with col1:
    left_name = st.selectbox(
        "Select the left layer",
        names,
        index=names.index("Great Britain - Bartholomew Half Inch, 1897-1907"),
    )

with col2:
    right_name = st.selectbox(
        "Select the right layer",
        names,
        index=names.index("HYBRID"),
    )

with col3:
    # lat = st.slider('Latitude', -90.0, 90.0, 55.68, step=0.01)
    lat = st.text_input("Latitude", " 55.68")

with col4:
    # lon = st.slider('Longitude', -180.0, 180.0, -2.98, step=0.01)
    lon = st.text_input("Longitude", "-2.98")

with col5:
    # zoom = st.slider('Zoom', 1, 24, 6, step=1)
    zoom = st.text_input("Zoom", "6")

with col6:
    checkbox = st.checkbox("Add OS 25 inch")

# with col7:
with st.expander("Acknowledgements"):
    markdown = """
    The map tile access is by kind arrangement of the National Library of Scotland on the understanding that re-use is for personal purposes. They host most of the map layers except these:
- The Roy Maps are owned by the British Library.
- The Great Britain – OS maps 1:25,000, 1937-61 and One Inch 7th series, 1955-61 are hosted by MapTiler.

If you wish you use these layers within a website, or for a commercial or public purpose, please view the [National Library of Scotland Historic Maps Subscription API](https://maps.nls.uk/projects/subscription-api/) or contact them at maps@nls.uk.
    """
    st.markdown(markdown, unsafe_allow_html=True)

m = leafmap.Map(
    center=[float(lat), float(lon)],
    zoom=int(zoom),
    locate_control=True,
    draw_control=False,
    measure_control=False,
)
measure = plugins.MeasureControl(position="bottomleft", active_color="orange")
measure.add_to(m)

if left_name in basemaps:
    left_layer = basemaps[left_name]
else:
    left_layer = folium.TileLayer(
        tiles=links[names.index(left_name)],
        name=left_name,
        attr="National Library of Scotland",
        overlay=True,
    )

if right_name in basemaps:
    right_layer = basemaps[right_name]
else:
    right_layer = folium.TileLayer(
        tiles=links[names.index(right_name)],
        name=right_name,
        attr="National Library of Scotland",
        overlay=True,
    )

if checkbox:
    for index, name in enumerate(names):
        if "OS 25 inch" in name:
            m.add_tile_layer(
                links[index], name, attribution="National Library of Scotland"
            )

m.split_map(left_layer, right_layer)
m.to_streamlit(height=600)