Add Avg Index

app.py

@@ -838,7 +838,7 @@ def compute_index_histogram(file_url: str, index_name: str, start_date: str, end
 
     # Use median composite to avoid cloud spikes
     # mosaic = collection.median()
-    mosaic = collection.median().reproject(crs='EPSG:4326', scale=10)
+    mosaic = collection.qualityMosaic(index_name)
     mean_val = mosaic.reduceRegion(
         reducer=ee.Reducer.mean(),
         geometry=ee_geometry,