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import ast |
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import streamlit as st |
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import leafmap.foliumap as leafmap |
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st.set_page_config(layout="wide") |
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st.sidebar.info( |
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""" |
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- Web App URL: <https://streamlit.gishub.org> |
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- GitHub repository: <https://github.com/giswqs/streamlit-geospatial> |
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""" |
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) |
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st.sidebar.title("Contact") |
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st.sidebar.info( |
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""" |
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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) |
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""" |
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) |
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@st.cache(allow_output_mutation=True) |
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def get_layers(url): |
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options = leafmap.get_wms_layers(url) |
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return options |
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def app(): |
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st.title("Web Map Service (WMS)") |
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st.markdown( |
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""" |
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This app is a demonstration of loading Web Map Service (WMS) layers. Simply enter the URL of the WMS service |
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in the text box below and press Enter to retrieve the layers. Go to https://apps.nationalmap.gov/services to find |
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some WMS URLs if needed. |
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""" |
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) |
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row1_col1, row1_col2 = st.columns([3, 1.3]) |
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width = 800 |
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height = 600 |
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layers = None |
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with row1_col2: |
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esa_landcover = "https://services.terrascope.be/wms/v2" |
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url = st.text_input( |
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"Enter a WMS URL:", value="https://services.terrascope.be/wms/v2" |
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) |
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empty = st.empty() |
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if url: |
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options = get_layers(url) |
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default = None |
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if url == esa_landcover: |
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default = "WORLDCOVER_2020_MAP" |
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layers = empty.multiselect( |
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"Select WMS layers to add to the map:", options, default=default |
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) |
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add_legend = st.checkbox("Add a legend to the map", value=True) |
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if default == "WORLDCOVER_2020_MAP": |
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legend = str(leafmap.builtin_legends["ESA_WorldCover"]) |
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else: |
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legend = "" |
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if add_legend: |
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legend_text = st.text_area( |
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"Enter a legend as a dictionary {label: color}", |
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value=legend, |
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height=200, |
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) |
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with row1_col1: |
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m = leafmap.Map(center=(36.3, 0), zoom=2) |
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if layers is not None: |
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for layer in layers: |
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m.add_wms_layer( |
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url, layers=layer, name=layer, attribution=" ", transparent=True |
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) |
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if add_legend and legend_text: |
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legend_dict = ast.literal_eval(legend_text) |
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m.add_legend(legend_dict=legend_dict) |
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m.to_streamlit(height=height) |
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app() |
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