Add Comparison Map

app.py

@@ -467,6 +467,29 @@ def generate_comparison_maps(geometry_json, selected_index, selected_years, evi_
         progress((i + 1) / 2, desc=f"Generating map for {year}")
         start_date = f"{year}-{start_month:02d}-{start_day:02d}"
         end_date = f"{year}-{end_month:02d}-{end_day:02d}"
+        
+        wayback_url = None
+        wayback_title = "Default Satellite"
+        if not WAYBACK_DF.empty:
+            try:
+                target_date = datetime(int(year), start_month, 15)
+                # Find the index of the closest date in the wayback dataframe
+                nearest_idx = WAYBACK_DF.index.get_indexer([target_date], method='nearest')[0]
+                wayback_item = WAYBACK_DF.iloc[nearest_idx]
+                
+                wayback_title = f"Esri Wayback ({wayback_item.name.strftime('%Y-%m-%d')})"
+                wayback_url = (
+                    wayback_item["ResourceURL_Template"]
+                    .replace("{TileMatrixSet}", "GoogleMapsCompatible")
+                    .replace("{TileMatrix}", "{z}")
+                    .replace("{TileRow}", "{y}")
+                    .replace("{TileCol}", "{x}")
+                )
+            except Exception as e:
+                print(f"Could not find a suitable Wayback basemap for {year}: {e}")
+                # Fallback to default values if any error occurs
+                wayback_url = None
+                wayback_title = "Default Satellite"
 
         collection = (
             ee.ImageCollection("COPERNICUS/S2_SR_HARMONIZED")
@@ -486,8 +509,13 @@ def generate_comparison_maps(geometry_json, selected_index, selected_years, evi_
         mosaic = collection.qualityMosaic(selected_index)
         clipped_image = mosaic.select(selected_index).clip(ee_geometry)
 
+        # Create map and add the year-specific basemap
         m = gee_folium.Map(zoom_start=14)
-        m.add_basemap("SATELLITE")
+        if wayback_url:
+            m.add_tile_layer(wayback_url, name=wayback_title, attribution="Esri")
+        else:
+            m.add_basemap("SATELLITE")
+
         m.addLayer(clipped_image, vis_params, f"{selected_index} {year}")
         m.add_colorbar(vis_params=vis_params, label=f"{selected_index} Value")
         folium.GeoJson(geometry_gdf, name="Geometry", style_function=lambda x: {"color": "yellow", "fillOpacity": 0, "weight": 2.5}).add_to(m)