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| import streamlit as st | |
| from streamlit_folium import st_folium | |
| import folium | |
| from geopy.geocoders import Nominatim | |
| # Define the bounding box | |
| ZUERICH_BBOX = [8.364, 47.240, 9.0405, 47.69894] | |
| def within_bbox(lat, lon, bbox): | |
| """Check if a point is within the given bounding box.""" | |
| return bbox[1] <= lat <= bbox[3] and bbox[0] <= lon <= bbox[2] | |
| def select_coordinates(): | |
| st.title("Step 1: Select Location") | |
| instructions = """ | |
| 1. Choose a crop classification location. Search for a location or click on the map. | |
| 2. Proceed to the "Perform Crop Classification" step. | |
| _Note:_ The location must be within the green ZüriCrop area. | |
| """ | |
| st.sidebar.header("Instructions") | |
| st.sidebar.markdown(instructions) | |
| # Initialize a map centered around the midpoint of the bounding box | |
| midpoint_lat = (ZUERICH_BBOX[1] + ZUERICH_BBOX[3]) / 2 | |
| midpoint_lon = (ZUERICH_BBOX[0] + ZUERICH_BBOX[2]) / 2 | |
| m = folium.Map(location=[midpoint_lat, midpoint_lon], zoom_start=9) | |
| # Add the bounding box to the map as a rectangle | |
| folium.Rectangle( | |
| bounds=[[ZUERICH_BBOX[1], ZUERICH_BBOX[0]], [ZUERICH_BBOX[3], ZUERICH_BBOX[2]]], | |
| color="green", | |
| fill=True, | |
| fill_opacity=0.1 | |
| ).add_to(m) | |
| # Search for a location | |
| geolocator = Nominatim(user_agent="streamlit-app") | |
| location_query = st.text_input("Search for a location:") | |
| if location_query: | |
| location = geolocator.geocode(location_query) | |
| if location: | |
| lat, lon = location.latitude, location.longitude | |
| folium.Marker([lat, lon], tooltip=location.address).add_to(m) | |
| m.location = [lat, lon] | |
| m.zoom_start = 12 | |
| if within_bbox(lat, lon, ZUERICH_BBOX): | |
| st.success(f"Location found: {location.address}. It is within the bounding box.") | |
| st.session_state["selected_location"] = (lat, lon) | |
| else: | |
| st.error(f"Location found: {location.address}. It is outside the bounding box.") | |
| else: | |
| st.error("Location not found. Please try again.") | |
| # Add a click event listener to capture coordinates | |
| m.add_child(folium.LatLngPopup()) | |
| # Display the map using streamlit-folium | |
| st_data = st_folium(m, height=500, width=800) | |
| # Check if the user clicked within the bounding box | |
| if st_data["last_clicked"]: | |
| lat, lon = st_data["last_clicked"]["lat"], st_data["last_clicked"]["lng"] | |
| if within_bbox(lat, lon, ZUERICH_BBOX): | |
| st.success(f"Selected Location: Latitude {lat}, Longitude {lon}") | |
| st.session_state["selected_location"] = (lat, lon) | |
| else: | |
| st.error(f"Selected Location is outside the allowed area. Please select a location within the bounding box.") | |
| # Proceed to the next step | |
| link_disabled = "selected_location" not in st.session_state | |
| st.sidebar.page_link("pages/2_Perform_Crop_Classification.py", label="Proceed to Crop Classification", icon="🌾", disabled=link_disabled) | |
| if __name__ == "__main__": | |
| select_coordinates() |