diff --git a/B04_wf1_Surface/B04_wf1_Surface_Engine.py b/B04_wf1_Surface/B04_wf1_Surface_Engine.py
index 2626e4ec..0139e66d 100644
--- a/B04_wf1_Surface/B04_wf1_Surface_Engine.py
+++ b/B04_wf1_Surface/B04_wf1_Surface_Engine.py
@@ -232,7 +232,10 @@ def run_surface_analysis(
         )
         prj_path = prj_candidates[0] if prj_candidates else project_root / "result.prj"
 
-        from B04_wf1_Surface.B04_wf1_Surface_Engine_Extent import download_extent
+        from B04_wf1_Surface.B04_wf1_Surface_Engine_Extent import (
+            download_extent,
+            map_meta_covers,
+        )
         from B04_wf1_Surface.B04_wf1_Surface_Engine_GisVector import download_all_gis_vectors
         from B04_wf1_Surface.B04_wf1_Surface_Engine_VWorld import (
             download_vworld_satellite_map,
@@ -259,7 +262,9 @@ def run_surface_analysis(
         ]
         for item in layers:
             meta_path = processed_dir / f"vworld_{item['layer'].lower()}_meta.json"
-            if not rebuild and meta_path.is_file():
+            # 파일이 있어도 계획노선·여유 셀이 바뀌어 범위를 못 덮으면 다시 받는다.
+            # (B03 업로드가 부르는 경로는 rebuild=False라, 존재 여부만 보면 영영 갱신되지 않는다.)
+            if not rebuild and map_meta_covers(meta_path, bounds_dict_for_download):
                 continue
             try:
                 step_started = time.monotonic()
diff --git a/B04_wf1_Surface/B04_wf1_Surface_Engine_Extent.py b/B04_wf1_Surface/B04_wf1_Surface_Engine_Extent.py
index a35a20b3..de370354 100644
--- a/B04_wf1_Surface/B04_wf1_Surface_Engine_Extent.py
+++ b/B04_wf1_Surface/B04_wf1_Surface_Engine_Extent.py
@@ -7,6 +7,7 @@
 
 from __future__ import annotations
 
+import json
 import logging
 from pathlib import Path
 from typing import Any
@@ -81,6 +82,26 @@ def download_extent(
     }
 
 
+def map_meta_covers(meta_path: Path, extent: dict[str, list[float]]) -> bool:
+    """저장된 배경 지도가 필요한 범위를 이미 덮고 있는가.
+
+    파일 존재 여부만 보면 계획노선이 바뀌거나 여유 셀 설정을 바꿔도 옛 사진을 계속 쓴다
+    (B03 업로드 → 전처리 경로는 `rebuild=False`라 더더욱 다시 받지 않는다, 2026-08-01).
+    """
+    if not meta_path.is_file():
+        return False
+    try:
+        meta = json.loads(meta_path.read_text(encoding="utf-8"))
+        return (
+            float(meta["x_min"]) <= extent["x"][0]
+            and float(meta["x_max"]) >= extent["x"][1]
+            and float(meta["y_min"]) <= extent["y"][0]
+            and float(meta["y_max"]) >= extent["y"][1]
+        )
+    except (OSError, ValueError, KeyError, TypeError):
+        return False
+
+
 def sheet_reference_points_wgs84(
     project_root: Path,
     las_bounds: dict[str, list[float]],