Create histoire.py

pages/histoire.py

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+import streamlit as st
+import folium
+from streamlit_folium import folium_static
+import requests
+from PIL import Image
+import io
+from datetime import datetime, timedelta
+import imageio
+
+# Constants
+WMS_URL = "https://wms.geo.admin.ch/"
+LAYER_NAME = "ch.swisstopo.zeitreihen"
+
+def get_wms_image(bbox, width, height, time):
+    params = {
+        'SERVICE': 'WMS',
+        'VERSION': '1.3.0',
+        'REQUEST': 'GetMap',
+        'LAYERS': LAYER_NAME,
+        'STYLES': '',
+        'CRS': 'EPSG:4326',
+        'BBOX': ','.join(map(str, bbox)),
+        'WIDTH': width,
+        'HEIGHT': height,
+        'FORMAT': 'image/png',
+        'TIME': time.strftime('%Y-%m-%d')
+    }
+    response = requests.get(WMS_URL, params=params)
+    return Image.open(io.BytesIO(response.content))
+
+def create_animation(bbox, width, height, start_date, end_date, step):
+    images = []
+    current_date = start_date
+    while current_date <= end_date:
+        img = get_wms_image(bbox, width, height, current_date)
+        images.append(img)
+        current_date += step
+    return images
+
+# Streamlit app
+st.title("Swisstopo Historical Animation Generator")
+
+# Sidebar for input parameters
+st.sidebar.header("Input Parameters")
+start_year = st.sidebar.number_input("Start Year", min_value=1850, max_value=2022, value=1900)
+end_year = st.sidebar.number_input("End Year", min_value=1850, max_value=2022, value=2022)
+step_years = st.sidebar.number_input("Step (years)", min_value=1, max_value=50, value=10)
+
+# Main content
+st.subheader("Select Area of Interest")
+m = folium.Map(location=[46.8, 8.2], zoom_start=8)
+folium_static(m)
+
+if st.button("Generate Animation"):
+    # Get bounding box from the map
+    bounds = m.get_bounds()
+    bbox = [bounds['_southWest']['lng'], bounds['_southWest']['lat'],
+            bounds['_northEast']['lng'], bounds['_northEast']['lat']]
+
+    width, height = 800, 600  # Image dimensions
+    start_date = datetime(start_year, 1, 1)
+    end_date = datetime(end_year, 12, 31)
+    step = timedelta(days=step_years * 365)
+
+    with st.spinner("Generating animation..."):
+        images = create_animation(bbox, width, height, start_date, end_date, step)
+        
+        # Save as GIF
+        output_file = "historical_animation.gif"
+        imageio.mimsave(output_file, images, duration=1)  # 1 second per frame
+        
+        st.success(f"Animation generated and saved as {output_file}")
+        st.image(output_file)
+
+st.sidebar.info("This application generates historical animations using Swisstopo's WMS. Select the area of interest on the map, set the time range and step, then click 'Generate Animation'.")