fix: just use on dataframe to save memory

Author: Gigaszi

mapswipe_workers/mapswipe_workers/utils/process_mapillary.py

@@ -245,27 +245,27 @@ def get_image_metadata(
         downloaded_metadata["geometry"].apply(lambda geom: isinstance(geom, Point))
     ]
 
-    filtered_metadata = filter_results(
+    downloaded_metadata = filter_results(
         downloaded_metadata, creator_id, is_pano, organization_id, start_time, end_time
     )
 
     if (
-        filtered_metadata is None
-        or filtered_metadata.empty
-        or filtered_metadata.isna().all().all()
+        downloaded_metadata is None
+        or downloaded_metadata.empty
+        or downloaded_metadata.isna().all().all()
     ):
         raise ValueError("No Mapillary Features in the AoI match the filter criteria.")
 
     if sampling_threshold is not None:
-        filtered_metadata = spatial_sampling(filtered_metadata, sampling_threshold)
+        downloaded_metadata = spatial_sampling(downloaded_metadata, sampling_threshold)
 
-    total_images = len(filtered_metadata)
+    total_images = len(downloaded_metadata)
     if total_images > 100000:
         raise ValueError(
             f"Too many Images with selected filter options for the AoI: {total_images}"
         )
 
     return {
-        "ids": filtered_metadata["id"].tolist(),
-        "geometries": filtered_metadata["geometry"].tolist(),
+        "ids": downloaded_metadata["id"].tolist(),
+        "geometries": downloaded_metadata["geometry"].tolist(),
     }