Keep visible roof merging opt-in

scripts/assemble_belgium_building_corpus.py

@@ -102,6 +102,7 @@ def main() -> int:
     parser.add_argument("--output-dir", type=Path, required=True)
     parser.add_argument("--version", default="building-be-v1")
     parser.add_argument("--min-label-px", type=float, default=3.0)
+    parser.add_argument("--merge-touching-roofs", action="store_true")
     parser.add_argument("--freeze", action="store_true")
     args = parser.parse_args()
 
@@ -150,7 +151,7 @@ def main() -> int:
                 ),
                 reference_observed_at=reference.observed_at.isoformat() if reference.observed_at else None,
                 imagery_valid_to=raster.valid_to.isoformat() if raster.valid_to else None,
-                merge_touching_roofs=True,
+                merge_touching_roofs=args.merge_touching_roofs,
             )
             normalized_target.write_text(json.dumps(normalized, ensure_ascii=False), encoding="utf-8")
             audit_target.write_text(json.dumps(audit, ensure_ascii=False, indent=2), encoding="utf-8")