update app.py

app.py

@@ -145,6 +145,16 @@ def calculate_custom_formula(image, geometry, selected_bands, custom_formula, re
         return ee.Image(0).rename('custom_result').set('error', str(e))
 
 # Aggregation functions
+def aggregate_data_custom(collection):
+    collection = collection.map(lambda image: image.set('day', ee.Date(image.get('system:time_start')).format('YYYY-MM-dd')))
+    grouped_by_day = collection.aggregate_array('day').distinct()
+    def calculate_daily_mean(day):
+        daily_collection = collection.filter(ee.Filter.eq('day', day))
+        daily_mean = daily_collection.mean()
+        return daily_mean.set('day', day)
+    daily_images = ee.List(grouped_by_day.map(calculate_daily_mean))
+    return ee.ImageCollection(daily_images)
+    
 def aggregate_data_daily(collection):
     """
     Aggregates data on a daily basis.