diff --git a/B04_PreProcess/B04_PreProcess_Engine_SheetParser.py b/B04_PreProcess/B04_PreProcess_Engine_SheetParser.py
index 8d1ef96dd..59bf7027c 100644
--- a/B04_PreProcess/B04_PreProcess_Engine_SheetParser.py
+++ b/B04_PreProcess/B04_PreProcess_Engine_SheetParser.py
@@ -33,6 +33,7 @@ SHEET_LAYERS: dict[str, tuple[str, str]] = {
     "유수방향": ("N3P", "E0042326"),
     "기준점": ("N3P", "H0020000"),
     "지명": ("N3P", "H0040000"),
+    "도로중심선": ("N3L", "A0020000"),
 }
 
 # 산출 파일 접두사 (기존 processed/의 국가 GIS geojson과 구분)
diff --git a/D03_PlanAnalysis/D03_PlanAnalysis_Layers.py b/D03_PlanAnalysis/D03_PlanAnalysis_Layers.py
new file mode 100644
index 000000000..2e0b531a1
--- /dev/null
+++ b/D03_PlanAnalysis/D03_PlanAnalysis_Layers.py
@@ -0,0 +1,259 @@
+"""D 노선분석 지도 겹 — 도엽 겹 · 지적도 · 급경사 그림 (요구 395-2 · PLAN 569-1).
+
+- 도엽 겹(하천중심선 · 도로중심선 …) = 지형 받기 병합본 · 없으면 지난 병합 도엽에서 그 겹만 풀어 냄
+- 지적도 = 브이월드 WFS LX맵(`lt_c_landinfobasemap`) · B04 `request_vworld_wfs` 를 1 km 조각으로 ·
+  한 번 1,000 필지 한도 → 꽉 차면 넷으로 다시 쪼갬 · `pnu` 로 겹친 필지 거름 ·
+  저장 = `processed/연속지적도_bounds.geojson`(B04 `/geojson?layer=지적도` 자리) + 곁 열쇠
+- 급경사 = 평활 안 한 사업 DEM(`models_plan/dtm_sheet_<방법>.npz`) · E07 `slope_rad` ·
+  15° · 35° · 40° 단계 PNG · 파생 저장본(열쇠 = 격자 지문)
+
+계산 자리 = ③ 서버 단독.
+"""
+
+from __future__ import annotations
+
+import base64
+import io
+import json
+import logging
+import math
+import tempfile
+from concurrent.futures import ThreadPoolExecutor
+from pathlib import Path
+from typing import Any
+
+import numpy as np
+
+from B04_PreProcess.B04_PreProcess_Engine_GisVector import request_vworld_wfs
+from B04_PreProcess.B04_PreProcess_Engine_SheetParser import SHEET_LAYERS, parse_and_merge_sheets
+from B04_PreProcess.B04_PreProcess_Engine_SheetStore import get_project_map_sheets_dir
+from common_util.common_util_derived_store import (
+    derived_key,
+    file_stamp,
+    read_derived,
+    write_derived,
+)
+from common_util.common_util_json import atomic_write_json
+from config.config_system_terrain import SHEET_SURFACE_DEFAULT_METHOD
+
+logger = logging.getLogger(__name__)
+
+Box = tuple[float, float, float, float]  # x0, y0, x1, y1(작업 좌표계 m)
+
+CADASTRAL_TYPENAME = "lt_c_landinfobasemap"
+CADASTRAL_FILE = "연속지적도_bounds.geojson"
+CADASTRAL_KEY = "연속지적도_bounds.key.json"
+TILE_M = 1000.0
+WFS_LIMIT = 1000
+MAX_SPLIT = 3  # 1 km → 125 m 까지 쪼갬
+WFS_WORKERS = 4
+
+SLOPE_KIND = "plan_slope"
+SLOPE_VERSION = 1
+# (아래 °, 위 °, 색 RGBA) — 임도망_편성 완 · 중 · 급경사지 · 타당성평가 35° · 노선_배치 40° 연속
+SLOPE_BANDS = (
+    (15.0, 35.0, (250, 204, 21, 110)),
+    (35.0, 40.0, (249, 115, 22, 140)),
+    (40.0, 90.0, (220, 38, 38, 160)),
+)
+MAX_SIDE_PX = 4096  # ponytail: 한 변 넘으면 솎음 · 넓은 사업은 조각 그림으로
+
+
+def _read_json(path: Path) -> Any:
+    try:
+        return json.loads(path.read_text(encoding="utf-8"))
+    except (OSError, ValueError):
+        return None
+
+
+# ── 도엽 겹 ─────────────────────────────────────────────
+
+
+def ensure_sheet_layer(project_root: Path, key: str) -> Path:
+    """`processed/도엽_{key}.geojson` — 없으면 지난 병합 도엽에서 그 겹만 풀어 냄(0 건 = 빈 것)."""
+    if key not in SHEET_LAYERS:
+        raise KeyError(key)
+    processed = project_root / "B04_PreProcess" / "processed"
+    path = processed / f"도엽_{key}.geojson"
+    if path.is_file():
+        return path
+    sheets = (_read_json(processed / "sheet_merge.key.json") or {}).get("sheets") or []
+    if not sheets:
+        raise FileNotFoundError("병합한 도엽이 없습니다 — 지형 받기 뒤 보입니다.")
+    parse_and_merge_sheets(get_project_map_sheets_dir(project_root), sheets, processed, [key])
+    if not path.is_file():
+        atomic_write_json(path, {"type": "FeatureCollection", "features": []})
+    return path
+
+
+# ── 지적도 ──────────────────────────────────────────────
+
+
+def tiles(box: Box, size: float = TILE_M) -> list[Box]:
+    """상자를 `size` 칸으로 쪼갬(끝 칸은 남은 만큼)."""
+    x0, y0, x1, y1 = box
+    nx, ny = max(1, math.ceil((x1 - x0) / size)), max(1, math.ceil((y1 - y0) / size))
+    return [
+        (x0 + i * size, y0 + j * size, min(x1, x0 + (i + 1) * size), min(y1, y0 + (j + 1) * size))
+        for j in range(ny)
+        for i in range(nx)
+    ]
+
+
+def quarter(box: Box) -> list[Box]:
+    x0, y0, x1, y1 = box
+    xm, ym = (x0 + x1) / 2, (y0 + y1) / 2
+    return [(x0, y0, xm, ym), (xm, y0, x1, ym), (x0, ym, xm, y1), (xm, ym, x1, y1)]
+
+
+def _lonlat_bounds(box: Box, epsg: int) -> dict[str, float]:
+    from common_util.common_util_crs import tm_to_lonlat
+
+    x0, y0, x1, y1 = box
+    ring = [tm_to_lonlat(x, y, epsg) for x, y in ((x0, y0), (x1, y0), (x1, y1), (x0, y1))]
+    lons, lats = [p[0] for p in ring], [p[1] for p in ring]
+    return {"min_lon": min(lons), "min_lat": min(lats), "max_lon": max(lons), "max_lat": max(lats)}
+
+
+def _wfs(box: Box, epsg: int) -> list[dict[str, Any]] | None:
+    """조각 하나 — B04 WFS 받기(실패 = 파일 없음 · 키 값은 남기지 않음). None = 실패."""
+    with tempfile.TemporaryDirectory() as folder:
+        request_vworld_wfs(
+            CADASTRAL_TYPENAME, "tile.geojson", _lonlat_bounds(box, epsg), Path(folder)
+        )
+        data = _read_json(Path(folder) / "tile.geojson")
+    if not isinstance(data, dict) or not isinstance(data.get("features"), list):
+        return None
+    return data["features"]
+
+
+def fetch_tile(box: Box, epsg: int, depth: int = 0) -> tuple[list[dict[str, Any]], int]:
+    """(필지, 실패 조각 수) — 1,000 꽉 차면 넷으로 다시 쪼갬."""
+    features = _wfs(box, epsg)
+    if features is None:
+        return [], 1
+    if len(features) < WFS_LIMIT or depth >= MAX_SPLIT:
+        return features, 0
+    out: list[dict[str, Any]] = []
+    failed = 0
+    for part in quarter(box):
+        got, bad = fetch_tile(part, epsg, depth + 1)
+        out.extend(got)
+        failed += bad
+    return out, failed
+
+
+def dedup_parcels(features: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    """조각 경계에 걸친 필지 — `pnu`(없으면 지물 id) 첫 것만."""
+    seen: set[str] = set()
+    out = []
+    for feature in features:
+        props = feature.get("properties") or {}
+        key = str(props.get("pnu") or feature.get("id") or json.dumps(feature.get("geometry")))
+        if key not in seen:
+            seen.add(key)
+            out.append(feature)
+    return out
+
+
+def _covers(have: Any, box: Box) -> bool:
+    try:
+        return have[0] <= box[0] and have[1] <= box[1] and have[2] >= box[2] and have[3] >= box[3]
+    except (TypeError, IndexError):
+        return False
+
+
+def ensure_cadastral(processed: Path, box: Box, epsg: int) -> dict[str, Any]:
+    """지적도 — 열쇠 상자가 덮고 실패 조각 없으면 그대로 · 아니면 상자 통째로 다시 받음."""
+    path, key_path = processed / CADASTRAL_FILE, processed / CADASTRAL_KEY
+    key = _read_json(key_path) or {}
+    if path.is_file() and not key.get("failed") and _covers(key.get("box"), box):
+        return {"path": path, "fetched": False, "count": key.get("count"), "failed": 0}
+    parts = tiles(box)
+    with ThreadPoolExecutor(max_workers=WFS_WORKERS) as pool:
+        results = list(pool.map(lambda part: fetch_tile(part, epsg), parts))
+    failed = sum(bad for _, bad in results)
+    if failed == len(parts):
+        raise RuntimeError(f"지적도를 받지 못했습니다 — 브이월드 WFS 조각 {failed}개 실패")
+    features = dedup_parcels([f for got, _ in results for f in got])
+    processed.mkdir(parents=True, exist_ok=True)
+    atomic_write_json(path, {"type": "FeatureCollection", "features": features})
+    atomic_write_json(
+        key_path,
+        {
+            "box": [round(v, 3) for v in box],
+            "epsg": int(epsg),
+            "count": len(features),
+            "failed": failed,
+        },
+    )
+    logger.info("D 지적도 받기: 조각 %d · 실패 %d · 필지 %d", len(parts), failed, len(features))
+    return {"path": path, "fetched": True, "count": len(features), "failed": failed}
+
+
+# ── 급경사 ──────────────────────────────────────────────
+
+
+def slope_bands_png(z: np.ndarray, valid: np.ndarray, cell_m: float) -> dict[str, Any]:
+    """격자(행 = 남 → 북) → 단계 PNG(위 = 북 · 15° 미만 · 빈 칸 투명) + 단계 칸 비율."""
+    from PIL import Image
+
+    from E07_StabArea.E07_StabArea_Engine import slope_rad
+
+    stride = max(1, math.ceil(max(z.shape) / MAX_SIDE_PX))
+    grid = np.where(valid, np.asarray(z, float), np.nan)[::stride, ::stride]
+    deg = np.degrees(slope_rad(grid, cell_m * stride))
+    known = np.isfinite(deg)
+    index = np.zeros(deg.shape, np.uint8)
+    for i, (low, high, _) in enumerate(SLOPE_BANDS, start=1):
+        index[known & (deg >= low) & (deg < high)] = i
+    total = max(1, int(known.sum()))
+    image = Image.fromarray(np.flipud(index), mode="P")
+    palette = [0, 0, 0] + [c for _, _, rgba in SLOPE_BANDS for c in rgba[:3]]
+    image.putpalette(palette + [0] * (768 - len(palette)))
+    alpha = bytes([0] + [rgba[3] for _, _, rgba in SLOPE_BANDS])
+    buffer = io.BytesIO()
+    image.save(buffer, format="PNG", optimize=True, transparency=alpha)
+    return {
+        "width": image.width,
+        "height": image.height,
+        "image": "data:image/png;base64," + base64.b64encode(buffer.getvalue()).decode("ascii"),
+        "bands": [
+            {
+                "min_deg": low,
+                "max_deg": high,
+                "color": "#{:02x}{:02x}{:02x}".format(*rgba[:3]),
+                "ratio": round(int((index == i).sum()) / total, 4),
+            }
+            for i, (low, high, rgba) in enumerate(SLOPE_BANDS, start=1)
+        ],
+    }
+
+
+def slope_layer(project_root: Path, models_dir: Path, epsg: int) -> dict[str, Any]:
+    """급경사 겹 — 지문(격자 파일 · 단계 · 판) 같으면 저장본 그대로."""
+    from common_util.common_util_crs import tm_to_lonlat
+
+    npz = models_dir / f"dtm_sheet_{SHEET_SURFACE_DEFAULT_METHOD}.npz"
+    stamp = file_stamp(npz)
+    if stamp is None:
+        raise FileNotFoundError("사업 지형면이 없습니다 — 지형 받기 뒤 보입니다.")
+    key = derived_key(
+        SLOPE_KIND, SLOPE_VERSION, npz.name, stamp, int(epsg), SLOPE_BANDS, MAX_SIDE_PX
+    )
+    saved = read_derived(project_root, SLOPE_KIND, key)
+    if saved is not None:
+        return saved["value"]
+    with np.load(npz) as dem:
+        x, y = np.asarray(dem["x"], float), np.asarray(dem["y"], float)
+        cell = float(dem["resolution"][0]) if "resolution" in dem.files else float(x[1] - x[0])
+        value = slope_bands_png(dem["z"], np.asarray(dem["valid_mask"], bool), cell)
+    half = cell / 2
+    box = (x[0] - half, y[0] - half, x[-1] + half, y[-1] + half)
+    value["box_m"] = [float(v) for v in box]
+    value["box"] = [
+        list(tm_to_lonlat(px, py, epsg))
+        for px, py in ((box[0], box[1]), (box[2], box[1]), (box[2], box[3]), (box[0], box[3]))
+    ]
+    write_derived(project_root, SLOPE_KIND, key, value)
+    return value
diff --git a/D03_PlanAnalysis/D03_PlanAnalysis_Router.py b/D03_PlanAnalysis/D03_PlanAnalysis_Router.py
index c4a4be961..1de51d747 100644
--- a/D03_PlanAnalysis/D03_PlanAnalysis_Router.py
+++ b/D03_PlanAnalysis/D03_PlanAnalysis_Router.py
@@ -3,6 +3,7 @@
 - `GET /api/projects/{id}/plan/terrain/extent` — 받기 전 범위(상자 · 도엽 · 칸 수 · 받은 범위)
 - `POST …/plan/terrain` — 사업 전체 지형 한 벌 받기(뒤에서 · 누를 때만) · 끝나면 `surface_models` 행
 - `GET …/plan/progress` — 일의 진행률
+- `GET …/plan/layers/sheet?key=` · `…/cadastral` · `…/raster?kind=slope` — 지도 겹(PLAN 569-1)
 
 범위 = 전체 시점 · 종점(D02 정본 `load_base`) + 그은 점(`extra`) 상자 + 여유.
 노선 정본(손 그은 선)은
@@ -18,13 +19,15 @@ from pathlib import Path
 from typing import Any
 from uuid import UUID
 
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter, HTTPException, Request, Response
 from pydantic import BaseModel
 
 from B03_FileInput.B03_FileInput_Repository import get_project_storage_relative_path
+from common_util.common_util_http_cache import cached_file_response
 from common_util.common_util_storage import resolve_stored_project_path
 from config.config_db import get_db_pool
 from D02_PlanBase import D02_PlanBase_Router as base
+from D03_PlanAnalysis import D03_PlanAnalysis_Layers as layers
 from D03_PlanAnalysis import D03_PlanAnalysis_Terrain as terrain
 
 logger = logging.getLogger(__name__)
@@ -153,3 +156,53 @@ async def plan_progress(project_id: UUID) -> dict[str, Any]:
         "status": "success",
         **{kind: dict(_JOBS.get((str(project_id), kind)) or idle) for kind in KINDS},
     }
+
+
+async def _layer_root(project_id: UUID) -> tuple[Path, int, terrain.Box]:
+    """(실경로, 좌표계, 받은 범위) — 지형 받기 전이면 404."""
+    root, epsg, _ = await _plan_ends(project_id)
+    box = terrain.received_box(root)
+    if box is None:
+        raise HTTPException(status_code=404, detail="지형 받기 뒤 보입니다.")
+    return root, epsg, box
+
+
+@router.get("/{project_id}/plan/layers/sheet", response_model=None)
+async def plan_layer_sheet(project_id: UUID, key: str, request: Request) -> Response:
+    """도엽 겹 GeoJSON(하천중심선 · 도로중심선 …) — 없으면 지난 병합 도엽에서 풀어 냄."""
+    from B04_PreProcess.B04_PreProcess_Router_GIS import _display_copy
+
+    root, _, _ = await _layer_root(project_id)
+    try:
+        path = await asyncio.to_thread(layers.ensure_sheet_layer, root, key)
+    except KeyError as error:
+        raise HTTPException(status_code=400, detail=f"없는 도엽 겹: {key}") from error
+    except FileNotFoundError as error:
+        raise HTTPException(status_code=404, detail=str(error)) from error
+    display = await asyncio.to_thread(_display_copy, path)
+    return cached_file_response(request, display, "application/geo+json")
+
+
+@router.get("/{project_id}/plan/layers/cadastral", response_model=None)
+async def plan_layer_cadastral(project_id: UUID, request: Request) -> Response:
+    """지적도 GeoJSON(브이월드 LX맵 · 참고용) — 받은 범위를 덮지 않으면 지금 받음."""
+    root, epsg, box = await _layer_root(project_id)
+    processed = root / terrain.STAGE / "processed"
+    try:
+        got = await asyncio.to_thread(layers.ensure_cadastral, processed, box, epsg)
+    except RuntimeError as error:
+        raise HTTPException(status_code=502, detail=str(error)) from error
+    return cached_file_response(request, got["path"], "application/geo+json")
+
+
+@router.get("/{project_id}/plan/layers/raster", response_model=None)
+async def plan_layer_raster(project_id: UUID, kind: str = "slope") -> dict[str, Any]:
+    """급경사 단계 그림(15° · 35° · 40°) — 격자 지문 같으면 저장본."""
+    if kind != "slope":
+        raise HTTPException(status_code=400, detail=f"없는 그림 겹: {kind}")
+    root, epsg, _ = await _layer_root(project_id)
+    try:
+        value = await asyncio.to_thread(layers.slope_layer, root, terrain.models_dir_of(root), epsg)
+    except FileNotFoundError as error:
+        raise HTTPException(status_code=404, detail=str(error)) from error
+    return {"status": "success", "kind": kind, **value}
diff --git a/D03_PlanAnalysis/D03_PlanAnalysis_Terrain.py b/D03_PlanAnalysis/D03_PlanAnalysis_Terrain.py
index 9e909f37b..d59576bf3 100644
--- a/D03_PlanAnalysis/D03_PlanAnalysis_Terrain.py
+++ b/D03_PlanAnalysis/D03_PlanAnalysis_Terrain.py
@@ -6,6 +6,7 @@
 - 도엽 = 범위 상자에 닿는 도엽 모두 → `ensure_sheets`(없는 것만 · prune 없음)
 - 병합 = 지난번 병합 도엽 ∪ 이번 도엽(옛 도엽 유지 · 열쇠 같으면 건너뜀)
 - 위성 = 범위 도엽 도곽 ∪ 옛 위성 범위(덮으면 건너뜀)
+- 지적도 = 범위 상자 · 브이월드 WFS 1 km 조각(`D03_PlanAnalysis_Layers` · 실패해도 계속)
 - DEM = 한 벌 `models_plan/`(연도는 D03 나눔 뒤에 정해짐) · 받은 범위 = `plan_terrain.json`
 - 작업 좌표계 = 지점 epsg · `B03_FileInput/input/prj/plan.prj` 한 장(B04 · B05 좌표계 창구가 읽음)
 - 받기 전 범위 보기 = `plan_extent`(내려받기 없음) · 받기는 사용자가 누를 때만
@@ -42,6 +43,7 @@ from config.config_system_terrain import (
     SHEET_SURFACE_DEFAULT_METHOD,
     SHEET_SURFACE_MARGIN_M,
 )
+from D03_PlanAnalysis import D03_PlanAnalysis_Layers as layers
 
 logger = logging.getLogger(__name__)
 
@@ -254,6 +256,12 @@ def ensure_plan_terrain(
     merged = _merge_sheets(processed, store, list(got["available"]))
     report(60, "위성 지도 받는 중")
     satellite = _satellite(processed, prj, [(p[1], p[0]) for p in box_ring(box, epsg)], epsg)
+    report(62, "지적도 받는 중")
+    try:
+        cadastral = layers.ensure_cadastral(processed, box, epsg)["count"]
+    except Exception as exc:  # noqa: BLE001 — 지적도는 겹 · 지형 받기를 막지 않음(켤 때 다시)
+        logger.warning("D 지적도 받기 실패: %s", exc)
+        cadastral = None
 
     report(65, "사업 지형면 만드는 중")
     models_dir = models_dir_of(project_root)
@@ -287,6 +295,7 @@ def ensure_plan_terrain(
             "merged": merged,
         },
         "satellite": satellite,
+        "cadastral": cadastral,
         "box_m": list(box),
         "models": models,
     }
diff --git a/resources/tester/test_530_1_plan_terrain.py b/resources/tester/test_530_1_plan_terrain.py
index a019f61ec..082c77c00 100644
--- a/resources/tester/test_530_1_plan_terrain.py
+++ b/resources/tester/test_530_1_plan_terrain.py
@@ -54,6 +54,7 @@ def fake(tmp_path, monkeypatch):
     monkeypatch.setattr(terrain, "parse_and_merge_sheets", merge)
     monkeypatch.setattr(terrain, "download_vworld_satellite_map", satellite)
     monkeypatch.setattr(terrain, "build_sheet_surface_model", dem)
+    monkeypatch.setattr(terrain.layers, "ensure_cadastral", lambda *a: {"count": 0})  # 569-1
     return tmp_path, seen
 
 
diff --git a/resources/tester/test_569_1_plan_layers.py b/resources/tester/test_569_1_plan_layers.py
new file mode 100644
index 000000000..d6a057a32
--- /dev/null
+++ b/resources/tester/test_569_1_plan_layers.py
@@ -0,0 +1,181 @@
+"""D 노선분석 지도 겹(PLAN 569-1) — 도엽 겹 풀어 냄 · 지적도 1 km 조각 · 1,000 꽉 차면 넷 ·
+겹친 필지 거름 · 급경사 15° · 35° · 40° 단계 · 격자 지문 같으면 다시 안 셈.
+
+./venv/Scripts/python.exe -m pytest resources/tester/test_569_1_plan_layers.py -q
+"""
+
+import base64
+import io
+import itertools
+import json
+import os
+from pathlib import Path
+
+import numpy as np
+import pytest
+from PIL import Image
+
+from B04_PreProcess.B04_PreProcess_Engine_SheetParser import SHEET_LAYERS
+from D03_PlanAnalysis import D03_PlanAnalysis_Layers as layers
+
+EPSG = 5186
+BOX = (230000.0, 450000.0, 234700.0, 452500.0)  # 4.7 × 2.5 km
+
+
+# ── 도엽 겹 ──
+
+
+def test_road_layer_listed() -> None:
+    assert SHEET_LAYERS["도로중심선"] == ("N3L", "A0020000")
+    assert SHEET_LAYERS["하천중심선"] == ("N3L", "E0020000")
+
+
+def test_sheet_layer_unpacks_once(tmp_path, monkeypatch) -> None:
+    processed = tmp_path / "B04_PreProcess" / "processed"
+    processed.mkdir(parents=True)
+    calls = []
+
+    def merge(store, sheets, out, keys):
+        calls.append((list(sheets), keys))  # 지물 0 건 = 파일 안 씀
+
+    monkeypatch.setattr(layers, "parse_and_merge_sheets", merge)
+    with pytest.raises(FileNotFoundError):
+        layers.ensure_sheet_layer(tmp_path, "도로중심선")
+    with pytest.raises(KeyError):
+        layers.ensure_sheet_layer(tmp_path, "없는겹")
+    (processed / "sheet_merge.key.json").write_text(
+        json.dumps({"sheets": ["36712088", "36712089"], "parser": 2}), "utf-8"
+    )
+    path = layers.ensure_sheet_layer(tmp_path, "도로중심선")
+    assert calls == [(["36712088", "36712089"], ["도로중심선"])]
+    assert json.loads(path.read_text("utf-8"))["features"] == []
+    layers.ensure_sheet_layer(tmp_path, "도로중심선")
+    assert len(calls) == 1  # 있으면 그대로
+
+
+# ── 지적도 ──
+
+
+def test_tiles_cover_box() -> None:
+    parts = layers.tiles(BOX)
+    assert len(parts) == 15
+    assert sum((b[2] - b[0]) * (b[3] - b[1]) for b in parts) == pytest.approx(4700 * 2500)
+    assert max(b[2] for b in parts) == BOX[2] and max(b[3] for b in parts) == BOX[3]
+    assert len(layers.quarter(parts[0])) == 4
+
+
+class FakeWfs:
+    """조각 너비가 `full_deg` 보다 넓으면 1,000 필지(꽉 참) · 아니면 셋(하나는 이웃과 같은 pnu) ·
+    처음 `fail` 번은 실패(B04 꼴 — 파일 없음)."""
+
+    def __init__(self, full_deg: float = 1.0, fail: int = 0) -> None:
+        self.full_deg, self.fail, self._count = full_deg, fail, itertools.count(1)
+        self.calls = 0
+
+    def __call__(self, typename, filename, bounds, output_dir) -> None:
+        assert typename == "lt_c_landinfobasemap"
+        self.calls = next(self._count)  # 조각을 여러 줄기로 받음 — count 는 한 번에 하나
+        if self.calls <= self.fail:
+            return
+        width = bounds["max_lon"] - bounds["min_lon"]
+        tag = f"{bounds['min_lon']:.5f},{bounds['min_lat']:.5f}"
+        n = 1000 if width > self.full_deg else 3
+        feats = [{"id": f"{tag}/{i}", "properties": {"pnu": f"{tag}/{i}"}} for i in range(n)]
+        feats[-1]["properties"]["pnu"] = "SHARED"
+        body = {"type": "FeatureCollection", "features": feats}
+        (Path(output_dir) / filename).write_text(json.dumps(body), "utf-8")
+
+
+def test_full_tile_splits_into_four(monkeypatch) -> None:
+    fake = FakeWfs(full_deg=0.008)  # 1 km 칸 ≈ 0.011° 꽉 참 · 500 m 칸 = 셋
+    monkeypatch.setattr(layers, "request_vworld_wfs", fake)
+    got, failed = layers.fetch_tile((230000.0, 450000.0, 231000.0, 451000.0), EPSG)
+    assert fake.calls == 5 and failed == 0 and len(got) == 12
+
+
+def test_dedup_by_pnu() -> None:
+    feats = [{"properties": {"pnu": "1"}}, {"properties": {"pnu": "1"}}, {"id": "x"}]
+    assert len(layers.dedup_parcels(feats)) == 2
+
+
+def test_cadastral_fetch_once_then_grow(tmp_path, monkeypatch) -> None:
+    fake = FakeWfs()
+    monkeypatch.setattr(layers, "request_vworld_wfs", fake)
+    got = layers.ensure_cadastral(tmp_path, BOX, EPSG)
+    assert got["fetched"] and fake.calls == 15 and got["failed"] == 0
+    assert got["count"] == 15 * 2 + 1  # 조각마다 둘 + 같은 pnu 하나
+    saved = json.loads((tmp_path / layers.CADASTRAL_FILE).read_text("utf-8"))
+    assert len(saved["features"]) == got["count"]
+    again = layers.ensure_cadastral(tmp_path, (231000.0, 450500.0, 233000.0, 452000.0), EPSG)
+    assert not again["fetched"] and fake.calls == 15  # 덮으면 다시 안 받음
+    layers.ensure_cadastral(tmp_path, (*BOX[:2], BOX[2] + 500, BOX[3]), EPSG)
+    assert fake.calls == 15 + 18  # 넓어지면 상자 통째로 다시(5.2 km = 6 × 3 조각)
+
+
+def test_cadastral_failures(tmp_path, monkeypatch) -> None:
+    monkeypatch.setattr(layers, "request_vworld_wfs", FakeWfs(fail=99))
+    with pytest.raises(RuntimeError):
+        layers.ensure_cadastral(tmp_path, BOX, EPSG)
+    assert not (tmp_path / layers.CADASTRAL_FILE).exists()
+    monkeypatch.setattr(layers, "request_vworld_wfs", FakeWfs(fail=1))
+    first = layers.ensure_cadastral(tmp_path, BOX, EPSG)
+    assert first["failed"] == 1 and (tmp_path / layers.CADASTRAL_FILE).exists()
+    again = FakeWfs()
+    monkeypatch.setattr(layers, "request_vworld_wfs", again)
+    assert layers.ensure_cadastral(tmp_path, BOX, EPSG)["fetched"] and again.calls == 15
+
+
+# ── 급경사 ──
+
+
+def _plane(deg_south: float, deg_north: float, n: int = 40, cell: float = 2.0) -> np.ndarray:
+    """남쪽 반 = deg_south · 북쪽 반 = deg_north 경사(동쪽으로 오름)."""
+    x = np.arange(n) * cell
+    z = np.empty((n, n))
+    z[: n // 2] = x * np.tan(np.radians(deg_south))
+    z[n // 2 :] = x * np.tan(np.radians(deg_north))
+    return z
+
+
+def _indices(value) -> np.ndarray:
+    raw = base64.b64decode(value["image"].split(",", 1)[1])
+    return np.asarray(Image.open(io.BytesIO(raw)))
+
+
+def test_slope_bands_and_north_up() -> None:
+    z = _plane(10.0, 37.0)
+    value = layers.slope_bands_png(z, np.ones(z.shape, bool), 2.0)
+    ratios = [b["ratio"] for b in value["bands"]]
+    assert [b["min_deg"] for b in value["bands"]] == [15.0, 35.0, 40.0]
+    assert ratios[0] < 0.1 and 0.4 < ratios[1] < 0.6 and ratios[2] < 0.1  # 경계 줄만
+    index = _indices(value)
+    assert value["width"] == value["height"] == 40
+    assert (index[5, 5:35] == 2).all() and (index[-5, 5:35] == 0).all()  # 위 = 북 = 37°
+    steep = layers.slope_bands_png(_plane(45.0, 20.0), np.ones((40, 40), bool), 2.0)
+    assert steep["bands"][2]["ratio"] > 0.4 and steep["bands"][0]["ratio"] > 0.4
+    hole = np.ones(z.shape, bool)
+    hole[25:30, 10:20] = False
+    assert (_indices(layers.slope_bands_png(z, hole, 2.0))[-29:-24, 10:20] == 0).all()
+
+
+def test_slope_layer_fingerprint(tmp_path, monkeypatch) -> None:
+    models = tmp_path / "B04_PreProcess" / "models_plan"
+    models.mkdir(parents=True)
+    npz = models / "dtm_sheet_laplace.npz"
+    z = _plane(37.0, 37.0)
+    x = 200000.0 + np.arange(40) * 2.0
+    y = 450000.0 + np.arange(40) * 2.0
+    np.savez(npz, x=x, y=y, z=z, valid_mask=np.ones(z.shape, bool), resolution=[2.0])
+    counted = []
+    real = layers.slope_bands_png
+    monkeypatch.setattr(layers, "slope_bands_png", lambda *a: counted.append(1) or real(*a))
+    first = layers.slope_layer(tmp_path, models, EPSG)
+    assert first["box_m"] == [199999.0, 449999.0, 200079.0, 450079.0] and len(first["box"]) == 4
+    assert layers.slope_layer(tmp_path, models, EPSG) == first and len(counted) == 1
+    np.savez(npz, x=x, y=y, z=z * 0.5, valid_mask=np.ones(z.shape, bool), resolution=[2.0])
+    os.utime(npz, ns=(1, 1))
+    layers.slope_layer(tmp_path, models, EPSG)
+    assert len(counted) == 2  # 격자가 바뀌면 다시 셈
+    (npz).unlink()
+    with pytest.raises(FileNotFoundError):
+        layers.slope_layer(tmp_path, models, EPSG)