feat(계산묶음): 346-1 route · ground 단계 — 노선 초안 → 그린 노선(buildEditedPolyline 짝 그대로 · 길이 붙든 곡선 R 다시 잡음) · 측점 → 지반 채움 · 종단 지반선(계약 꼴) · 범위 밖 측점 · 종단 재사용(자리 · 축 · 지형 같을 때만) · 격자 없음 · 분석 지형 다름 = 주입 서버 길 · 시험(서버 generate_sections 와 같음 · 노선 1,078 m 1.4~6.9 ms)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Se7ytqbohmBQnfYpwYFnYf

B05_Profile/logic/B05_Profile_Pipeline_RouteGround.ts

@@ -0,0 +1,179 @@
+/* =============================================================================
+ * B05_Profile_Pipeline_RouteGround.ts
+ * 실시간 계산 묶음(PLAN 346-1)의 **route · ground 단계** — 계약 = `design_pipeline_types.ts`.
+ *
+ *   route  — 노선 초안(RouteDraft) → 그린 노선(원호 포함) · 누가거리. 선은 이미 있는 짝
+ *            `buildEditedPolyline`(↔ `common_util_route_polyline.py`) 그대로.
+ *   ground — 측점(지반 null) → 지반 채운 측점 · 종단 지반선(1 m). 표본 = 지형 격자 짝
+ *            (`common_util_surface_sampler.ts` · `B05_Profile_Sections_Ground.ts`) · 격자가 없거나
+ *            (아직 못 받음 · DTM 아님) 분석 지형 ≠ 설계 지형이면 주입받은 서버 표본(`remote`).
+ *            바뀐 범위 밖 측점 · 종단은 앞 출력 재사용(국부 연산) — 자리 · 축 · 지형이 같을 때만.
+ *
+ * 화면 · fetch · 세션 안 씀 — 격자 · 서버 길은 부르는 쪽이 넣음(`B05_Profile_Api_TerrainGrid.ts`).
+ * ========================================================================== */
+
+import type {
+  GroundOutput,
+  GroundSample,
+  PipelineStation,
+  RouteDraft,
+  RouteLine,
+  StageFn,
+  StationGround,
+  Vertex,
+} from "../../A00_Common/design/design_pipeline_types";
+import { type DtmGrid, heightAt } from "../../common_util/common_util_surface_sampler";
+import { buildEditedPolyline } from "../B05_Profile_UI_RouteEdit_Curve";
+import { applyArcLocks } from "../B05_Profile_UI_RouteEdit_Edits";
+import {
+  crossOffsets,
+  longitudinalPoints,
+  round6,
+  SECTION_CROSS_HALF_WIDTH_M,
+  SECTION_CROSS_SAMPLE_INTERVAL_M,
+} from "./B05_Profile_Sections_Ground";
+
+/* ── route ─────────────────────────────────────────────────────────────── */
+
+export interface RouteStageDeps {
+  /** 곡선 기본 반지름(m) — 편집기 `minRadiusM`(계획 기준 · 0 = 없음). */
+  minRadiusM(): number;
+  /** 초안이 없을 때(= 저장분 그대로) 그릴 노선 — 없으면 null. */
+  savedLine(): Vertex[] | null;
+}
+
+/** 정점마다 누가거리 — 첫 점 0. */
+export function routeLineOf(line: Vertex[]): RouteLine {
+  const chainage = [0];
+  for (let i = 1; i < line.length; i += 1) {
+    chainage.push(
+      chainage[i - 1] + Math.hypot(line[i][0] - line[i - 1][0], line[i][1] - line[i - 1][1]),
+    );
+  }
+  return { line, chainage, lengthM: chainage[chainage.length - 1] };
+}
+
+/** 초안 → 그린 노선. 길이를 붙든 곡선은 교각에 맞춰 R 을 다시 잡음(편집기 `markEdited` 와 같은 차례). */
+export function draftLine(draft: RouteDraft, minRadiusM: number): Vertex[] {
+  const nodes = draft.nodes.map((node): Vertex => [node[0], node[1]]);
+  const radius = [...draft.curveRadius];
+  applyArcLocks(nodes, [...draft.curveLock], [...draft.curveArc], radius);
+  return buildEditedPolyline(nodes, draft.curveOn, radius, minRadiusM).vertices;
+}
+
+export function createRouteStage(deps: RouteStageDeps): StageFn<"route"> {
+  return (ctx) => {
+    const draft = ctx.inputs.route;
+    const line = draft ? draftLine(draft, deps.minRadiusM()) : deps.savedLine();
+    if (!line || line.length < 2) throw new Error("그릴 노선이 없습니다.");
+    return routeLineOf(line);
+  };
+}
+
+/* ── ground ────────────────────────────────────────────────────────────── */
+
+export interface GroundStageDeps {
+  /** 지금 쓸 수 있는 설계 지형 격자 — 아직 못 받았거나 없으면 null(그동안은 서버 길). */
+  grid(): { grid: DtmGrid; design: "las" | "sheet" } | null;
+  /** 서버 표본(`/route/elevations`) — 점 차례 그대로 · 무효 null · `signal` 로 끊김. */
+  remote(
+    points: Vertex[],
+    terrain: string | null,
+    signal: AbortSignal,
+  ): Promise<Array<number | null>>;
+  /** 횡단 반폭(m) — 비면 서버 기본(20 m). */
+  crossHalfWidthM?(): number | null;
+}
+
+const samePlace = (a: PipelineStation, b: PipelineStation): boolean =>
+  a.x === b.x && a.y === b.y && a.left[0] === b.left[0] && a.left[1] === b.left[1];
+
+const outside = (chainageM: number, range: { fromM: number; toM: number } | null): boolean =>
+  range !== null && (chainageM < range.fromM || chainageM > range.toM);
+
+export function createGroundStage(deps: GroundStageDeps): StageFn<"ground"> {
+  /** 앞 출력이 쓴 지형 · 노선 · 반폭 — 다르면 재사용 안 함. */
+  let last: { terrain: string; line: Vertex[] | null; halfWidth: number } | null = null;
+
+  return async (ctx) => {
+    const stations = ctx.out.stations ?? [];
+    const line = ctx.out.route?.line ?? null;
+    const terrain = ctx.inputs.route?.terrain ?? null;
+    const halfWidth = deps.crossHalfWidthM?.() ?? SECTION_CROSS_HALF_WIDTH_M;
+    const offsets = crossOffsets(halfWidth, SECTION_CROSS_SAMPLE_INTERVAL_M);
+    const local = deps.grid();
+    const useGrid = local !== null && (terrain === null || terrain === local.design);
+
+    const tag = terrain ?? "design";
+    const reusable = ctx.prev !== null && last?.terrain === tag && last.halfWidth === halfWidth;
+    const range = ctx.range;
+    const prevByKey = new Map((reusable ? ctx.prev!.stations : []).map((s) => [s.key, s]));
+
+    // 다시 셀 측점 — 범위 안 · 앞 출력에 없음 · 자리나 축이 바뀜.
+    const kept = stations.map((station) => {
+      const before = prevByKey.get(station.key);
+      return before?.ground && outside(station.chainageM, range) && samePlace(before, station)
+        ? before.ground
+        : null;
+    });
+
+    const long = line ? longitudinalPoints(line) : { chainage: [], xy: [] as Vertex[], lengthM: 0 };
+    // 종단 — 노선이 그대로면 통째 · 범위 앞쪽은 같은 노선 위라 그대로.
+    const prevLong = reusable ? ctx.prev!.longitudinal : null;
+    const longKept: Array<number | null | undefined> = long.chainage.map((c, i) => {
+      if (!prevLong || prevLong.chainageM[i] !== round6(c)) return undefined;
+      if (last?.line === line || (range !== null && c < range.fromM)) return prevLong.z[i];
+      return undefined;
+    });
+
+    const points: Vertex[] = [];
+    stations.forEach((station, i) => {
+      if (kept[i]) return;
+      for (const offset of offsets) {
+        points.push([station.x + station.left[0] * offset, station.y + station.left[1] * offset]);
+      }
+    });
+    long.xy.forEach((xy, i) => {
+      if (longKept[i] === undefined) points.push(xy);
+    });
+
+    let heights: Array<number | null>;
+    if (useGrid) {
+      heights = points.map(([x, y]) => {
+        const z = heightAt(local!.grid, x, y);
+        return Number.isNaN(z) ? null : round6(z);
+      });
+    } else {
+      heights = points.length ? await deps.remote(points, terrain, ctx.signal) : [];
+    }
+
+    let cursor = 0;
+    const filled: PipelineStation[] = stations.map((station, i) => {
+      if (kept[i]) return { ...station, ground: kept[i] };
+      const zs = offsets.map(() => heights[cursor++] ?? null);
+      return { ...station, ground: stationGround(offsets, zs) };
+    });
+    const z = long.chainage.map((_, i) =>
+      longKept[i] === undefined ? (heights[cursor++] ?? null) : (longKept[i] as number | null),
+    );
+    last = { terrain: tag, line, halfWidth };
+    const output: GroundOutput = {
+      stations: filled,
+      longitudinal: { chainageM: long.chainage.map(round6), z },
+    };
+    return output;
+  };
+}
+
+/** offset 열 표고 → 계약 꼴(중심 · 좌 · 우 · 중심에서 바깥 차례 · offsetM 양수). */
+function stationGround(offsets: number[], zs: Array<number | null>): StationGround {
+  const left: GroundSample[] = [];
+  const right: GroundSample[] = [];
+  let centerZ: number | null = null;
+  offsets.forEach((offset, i) => {
+    if (Math.abs(offset) <= 1e-9) centerZ = zs[i];
+    else if (offset > 0) left.push({ offsetM: round6(offset), z: zs[i] });
+    else right.unshift({ offsetM: round6(-offset), z: zs[i] });
+  });
+  return { centerZ, left, right };
+}

B05_Profile/logic/B05_Profile_Sections_Ground.ts

@@ -70,7 +70,7 @@ export interface GroundOptions {
 }
 
 /** 파이썬 `round(x, 6)` 자리. */
-const round6 = (value: number): number => Math.round(value * 1e6) / 1e6;
+export const round6 = (value: number): number => Math.round(value * 1e6) / 1e6;
 const round9 = (value: number): number => Math.round(value * 1e9) / 1e9;
 
 function sample(grid: DtmGrid, x: number, y: number): GroundSample {
@@ -100,7 +100,7 @@ function cleanLine(line: ReadonlyArray<Vertex>): {
 }
 
 /** 횡단 offset 열 — `np.arange(-hw, hw + si/2, si)` · hw 넘는 것 버림 · 0 없으면 끼움. */
-function crossOffsets(halfWidth: number, interval: number): number[] {
+export function crossOffsets(halfWidth: number, interval: number): number[] {
   const count = Math.ceil((halfWidth + interval * 0.5 + halfWidth) / interval);
   const offsets: number[] = [];
   for (let i = 0; i < count; i += 1) {
@@ -114,6 +114,33 @@ function crossOffsets(halfWidth: number, interval: number): number[] {
   return offsets;
 }
 
+/** 종단 표본 자리 — 누가거리(간격 · 끝점 포함) · 자리 = `_interpolate_xy`(축마다 `np.interp`). */
+export function longitudinalPoints(
+  line: ReadonlyArray<Vertex>,
+  intervalM: number = SECTION_LONG_SAMPLE_INTERVAL_M,
+): { chainage: number[]; xy: Vertex[]; lengthM: number } {
+  const { xs, ys, chainage: along } = cleanLine(line);
+  const chainage = stationsAlong(line, intervalM, true);
+  const xy = chainage.map((c): Vertex => [npInterp(c, along, xs), npInterp(c, along, ys)]);
+  return { chainage, xy, lengthM: along[along.length - 1] ?? 0 };
+}
+
+/** 측점 자리 · 좌측 축 — 자리 = `_interpolate_xy` · 축 = 측점 틀 짝(`stationFrameAt`). 못 재면 뺌. */
+export function placeStations(
+  line: ReadonlyArray<Vertex>,
+  stationsM: ReadonlyArray<number>,
+  longIntervalM: number = SECTION_LONG_SAMPLE_INTERVAL_M,
+): Array<{ chainage: number; origin: Vertex; left: Vertex }> {
+  const { xs, ys, chainage: along } = cleanLine(line);
+  const probe = Math.max(longIntervalM, 0.5);
+  return stationsM.flatMap((chainage) => {
+    const frame = stationFrameAt(line, chainage, probe);
+    if (!frame) return [];
+    const origin: Vertex = [npInterp(chainage, along, xs), npInterp(chainage, along, ys)];
+    return [{ chainage, origin, left: frame.left }];
+  });
+}
+
 /** 노선 지반선 — 종단 표본 · 측점마다 중심 · 좌측 축 · 횡단 표본. `stationsM` = 측점 누가거리. */
 export function sectionsGround(
   line: ReadonlyArray<Vertex>,
@@ -124,15 +151,12 @@ export function sectionsGround(
   const halfWidth = options.crossHalfWidthM ?? SECTION_CROSS_HALF_WIDTH_M;
   const interval = options.crossSampleIntervalM ?? SECTION_CROSS_SAMPLE_INTERVAL_M;
   const longInterval = options.longSampleIntervalM ?? SECTION_LONG_SAMPLE_INTERVAL_M;
-  const probe = Math.max(longInterval, 0.5);
 
-  // 자리 = `_interpolate_xy`(축마다 `np.interp`) · 좌측 축만 측점 틀 짝(`stationFrameAt`).
-  const { xs, ys, chainage: along } = cleanLine(line);
-  const at = (c: number): Vertex => [npInterp(c, along, xs), npInterp(c, along, ys)];
-  const samples: LongGroundSample[] = stationsAlong(line, longInterval, true).map((chainage) => {
-    const [x, y] = at(chainage);
-    return { chainage_m: round6(chainage), ...sample(grid, x, y) };
-  });
+  const long = longitudinalPoints(line, longInterval);
+  const samples: LongGroundSample[] = long.chainage.map((chainage, i) => ({
+    chainage_m: round6(chainage),
+    ...sample(grid, long.xy[i][0], long.xy[i][1]),
+  }));
 
   const offsets = crossOffsets(halfWidth, interval);
   let center = 0;
@@ -141,11 +165,9 @@ export function sectionsGround(
   });
 
   const stations: StationGround[] = [];
-  for (const chainage of stationsM) {
-    const frame = stationFrameAt(line, chainage, probe);
-    if (!frame) continue;
-    const [ox, oy] = at(chainage);
-    const [lx, ly] = frame.left;
+  for (const { chainage, origin, left } of placeStations(line, stationsM, longInterval)) {
+    const [ox, oy] = origin;
+    const [lx, ly] = left;
     const cross: CrossGroundPoint[] = [];
     const raw: number[] = [];
     for (const offset of offsets) {
@@ -176,7 +198,7 @@ export function sectionsGround(
       samples: cross,
     });
   }
-  return { length_m: round6(along[along.length - 1] ?? 0), samples, stations };
+  return { length_m: round6(long.lengthM), samples, stations };
 }
 
 /** `np.interp(x, xp, fp)` — xp 오름차순 · 범위 밖은 끝값 · 식 차례도 numpy 와 같음. */

resources/tester/test_346_1_route_ground_stage.py

@@ -0,0 +1,290 @@
+"""PLAN 346-1 — 계산 묶음 route · ground 단계(`logic/B05_Profile_Pipeline_RouteGround.ts`).
+
+route = 노선 초안 → 그린 노선(서버 `build_planned_polyline` 편집 갈래와 같은 선).
+ground = 측점 → 지반 채움 · 종단 지반선(서버 `generate_sections` 와 같은 표본).
+격자 없음 · 분석 지형 다름 = 서버 길 · 바뀐 범위 밖 재사용 · 노선 1,078 m 한 번 시간.
+"""
+
+from __future__ import annotations
+
+import csv
+import json
+import re
+import subprocess
+import sys
+from pathlib import Path
+
+import numpy as np
+import pytest
+
+ROOT = Path(__file__).resolve().parents[2]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+from B05_Profile import B05_Profile_Engine_Sections_Core as core  # noqa: E402
+from common_util.common_util_route_polyline import build_planned_polyline  # noqa: E402
+from common_util.common_util_surface_sampler import DtmGridSampler, dtm_grid_bytes  # noqa: E402
+
+TS_FILE = ROOT / "B05_Profile" / "logic" / "B05_Profile_Pipeline_RouteGround.ts"
+TSC = ROOT / "config" / "node_modules" / "typescript" / "bin" / "tsc"
+PROJECT = ROOT / "storage/1/3/1bb0f876-983f-4ca5-9cc7-f59ee1f77e0a"
+REAL_GRID = PROJECT / "B04_PreProcess/models/dtm_classification_smooth.npz"
+REAL_ROUTE = PROJECT / "B05_Profile/route/planned_route_initial.csv"
+REAL_NODES = PROJECT / "B05_Profile/route/planned_route_initial_nodes.csv"
+_TOL = 1.5e-6
+MIN_RADIUS_M = 12.0
+
+_RUNNER = """
+import { readFileSync, writeFileSync } from "node:fs";
+import { parseDtmGrid, heightAt } from "./common_util/common_util_surface_sampler.js";
+import { placeStations } from "./B05_Profile/logic/B05_Profile_Sections_Ground.js";
+import {
+  createRouteStage, createGroundStage,
+} from "./B05_Profile/logic/B05_Profile_Pipeline_RouteGround.js";
+const bytes = readFileSync(process.argv[2]);
+const grid = parseDtmGrid(bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.length));
+const job = JSON.parse(readFileSync(process.argv[3], "utf8"));
+const n = job.nodes.length;
+const draft = {
+  rev: 1, nodes: job.nodes, curveOn: Array(n).fill(true), curveRadius: Array(n).fill(null),
+  curveLock: Array(n).fill(null), curveArc: Array(n).fill(null), stationSnap: false, terrain: null,
+};
+const routeStage = createRouteStage({ minRadiusM: () => job.minRadius, savedLine: () => job.line });
+const ctxOf = (extra) => ({
+  generation: 1, range: null, signal: new AbortController().signal,
+  inputs: { route: null, alignment: null, cross: null, pipes: null, structures: null },
+  out: {}, before: {}, prev: null, ...extra,
+});
+const route = routeStage(ctxOf({ inputs: { route: draft } }));
+const saved = routeStage(ctxOf({}));
+let noRoute = null;
+try { createRouteStage({ minRadiusM: () => 12, savedLine: () => null })(ctxOf({})); }
+catch (error) { noRoute = String(error.message); }
+
+const line = job.line;
+const stations = placeStations(line, job.stations).map((s, i) => ({
+  key: `k${i}`, chainageM: s.chainage, x: s.origin[0], y: s.origin[1], azimuthDeg: 0,
+  left: s.left, kind: "grid", id: null, ground: null,
+  planRadiusM: null, curveOuterSide: null, curveWideningM: null,
+}));
+const lineOut = { line, chainage: [], lengthM: 0 };
+let remoteCalls = [];
+const remote = async (points, terrain) => {
+  remoteCalls.push({ count: points.length, terrain });
+  return points.map(([x, y]) => {
+    const z = heightAt(grid, x, y);
+    return Number.isNaN(z) ? null : Math.round(z * 1000) / 1000;
+  });
+};
+let ready = null;
+const ground = createGroundStage({ grid: () => ready, remote });
+const run = (extra) => ground(ctxOf({ out: { route: lineOut, stations }, ...extra }));
+
+const out = { route, saved, noRoute };
+out.serverPath = await run({});           // 격자 받기 전 = 서버 길
+out.serverCalls = remoteCalls; remoteCalls = [];
+ready = { grid, design: "las" };
+out.gridPath = await run({});             // 받은 뒤 = 브라우저 길
+out.gridCalls = remoteCalls.length;
+out.sheetPath = await run({ inputs: { route: { ...draft, terrain: "sheet" } } });
+out.sheetCalls = remoteCalls; remoteCalls = [];
+
+// 범위 밖 재사용 — 서버 길로 앞 출력을 받고 범위 [fromM, ∞) 만 다시
+ready = null;
+const reuseStage = createGroundStage({ grid: () => ready, remote });
+const first = await reuseStage(ctxOf({ out: { route: lineOut, stations } }));
+remoteCalls = [];
+const moved = stations.map((s, i) => (i === 1 ? { ...s, x: s.x + 0.5 } : s));
+const second = await reuseStage(ctxOf({
+  out: { route: lineOut, stations: moved }, prev: first,
+  range: { sources: ["grade"], fromM: job.fromM, toM: Infinity, keys: [] },
+}));
+out.reuseCalls = remoteCalls;
+out.reuse = second;
+ready = { grid, design: "las" };
+out.movedFull = await createGroundStage({ grid: () => ready, remote })(
+  ctxOf({ out: { route: lineOut, stations: moved } }));
+
+const timing = createGroundStage({ grid: () => ready, remote });
+for (let i = 0; i < 5; i += 1) await timing(ctxOf({ out: { route: lineOut, stations } }));
+const t0 = performance.now();
+for (let i = 0; i < 20; i += 1) await timing(ctxOf({ out: { route: lineOut, stations } }));
+out.ms = (performance.now() - t0) / 20;
+writeFileSync(process.argv[4], JSON.stringify(out));
+"""
+
+
+def _run_ts(tmp_path: Path, npz: Path, job: dict) -> dict:
+    out = tmp_path / "js"
+    subprocess.run(  # noqa: S603 — 고정 실행 파일
+        [
+            "node",
+            str(TSC),
+            str(TS_FILE),
+            "--outDir",
+            str(out),
+            "--rootDir",
+            str(ROOT),
+            "--module",
+            "esnext",
+            "--target",
+            "es2022",
+            "--moduleResolution",
+            "bundler",
+            "--ignoreConfig",
+        ],
+        cwd=str(ROOT),
+        check=True,
+        capture_output=True,
+    )
+    for emitted in out.rglob("*.js"):
+        emitted.write_text(
+            re.sub(r'(from\s+"\.\.?/[^"]+)"', r'\1.js"', emitted.read_text(encoding="utf-8")),
+            encoding="utf-8",
+        )
+    (out / "runner.mjs").write_text(_RUNNER, encoding="utf-8")
+    grid = tmp_path / "grid.bin"
+    grid.write_bytes(dtm_grid_bytes(npz))
+    payload = tmp_path / "job.json"
+    result = tmp_path / "out.json"
+    payload.write_text(json.dumps(job), encoding="utf-8")
+    subprocess.run(  # noqa: S603
+        ["node", str(out / "runner.mjs"), str(grid), str(payload), str(result)],
+        cwd=str(ROOT),
+        check=True,
+        capture_output=True,
+    )
+    return json.loads(result.read_text(encoding="utf-8"))
+
+
+def _read_xy(path: Path) -> list[list[float]]:
+    with path.open(encoding="utf-8") as handle:
+        return [[float(row["x"]), float(row["y"])] for row in csv.DictReader(handle)]
+
+
+def _contract_rows(station: dict) -> list[tuple[float, float | None]]:
+    """계약 꼴(중심 · 좌 · 우) → 서버 꼴 (offset, z) 오름차순."""
+    ground = station["ground"]
+    rows = [(-s["offsetM"], s["z"]) for s in ground["right"]]
+    rows += [(0.0, ground["centerZ"])] + [(s["offsetM"], s["z"]) for s in ground["left"]]
+    return sorted(rows)
+
+
+def _close(a, b, tol: float) -> bool:
+    return (a is None and b is None) or (
+        a is not None and b is not None and abs(float(a) - float(b)) <= tol
+    )
+
+
+def _fake_case(tmp_path: Path) -> tuple[Path, list, list, float]:
+    """가짜 격자 — 칸 폭 고르지 않음 · 빈칸 띠 · 노선이 빈칸 · 격자 끝을 지나감."""
+    rng = np.random.default_rng(3461)
+    x = (np.cumsum(rng.uniform(0.95, 1.1, 260)) + 1000.0).astype(np.float32)
+    y = (np.cumsum(rng.uniform(0.95, 1.1, 140)) + 2000.0).astype(np.float32)
+    xx, yy = np.meshgrid(x.astype(np.float64), y.astype(np.float64))
+    z = 500 + 0.08 * (xx - 1000) + 0.3 * (yy - 2000) + rng.normal(0, 0.2, xx.shape)
+    mask = np.ones(z.shape, dtype=bool)
+    mask[60:70, 100:115] = False
+    npz = tmp_path / "dtm_fake.npz"
+    np.savez(npz, x=x, y=y, z=z.astype(np.float32), valid_mask=mask)
+    nodes = [[1010.0, 2020.0], [1090.0, 2040.0], [1150.0, 2110.0], [1250.0, 2135.0]]
+    built = build_planned_polyline(
+        [tuple(n) for n in nodes],
+        min_radius_m=MIN_RADIUS_M,
+        simplify=False,
+        curve_flags=[True] * 4,
+        radii=[None] * 4,
+    )
+    return npz, [list(v) for v in built.vertices], nodes, 120.0
+
+
+def _real_case(_tmp_path: Path) -> tuple[Path, list, list, float]:
+    if not (REAL_GRID.is_file() and REAL_ROUTE.is_file() and REAL_NODES.is_file()):
+        pytest.skip("검증_sub8 없음")
+    return REAL_GRID, _read_xy(REAL_ROUTE), _read_xy(REAL_NODES), 600.0
+
+
+@pytest.mark.skipif(not TSC.is_file(), reason="프론트엔드 의존성 미설치")
+@pytest.mark.parametrize("case", [_fake_case, _real_case], ids=["가짜", "검증_sub8"])
+def test_route_ground_단계가_서버와_같고_범위_밖을_재사용한다(tmp_path: Path, case) -> None:
+    npz, line, nodes, from_m = case(tmp_path)
+    expected = core.generate_sections(
+        np.asarray(line, dtype=np.float64), DtmGridSampler.from_npz(npz)
+    )
+    stations = [s["chainage_m"] for s in expected["longitudinal"]["stations"]]
+    job = {
+        "line": line,
+        "nodes": nodes,
+        "minRadius": MIN_RADIUS_M,
+        "stations": stations,
+        "fromM": from_m,
+    }
+    out = _run_ts(tmp_path, npz, job)
+
+    # route — 서버 편집 갈래와 같은 선 · 누가거리 · 저장분 대체 · 노선 없음
+    built = build_planned_polyline(
+        [tuple(node) for node in nodes],
+        min_radius_m=MIN_RADIUS_M,
+        simplify=False,
+        curve_flags=[True] * len(nodes),
+        radii=[None] * len(nodes),
+    )
+    route = out["route"]
+    assert len(route["line"]) == len(built.vertices)
+    assert (
+        max(
+            abs(a - b)
+            for p, q in zip(route["line"], built.vertices, strict=True)
+            for a, b in zip(p, q)
+        )
+        < 1e-9
+    )
+    steps = np.hypot(*np.diff(np.asarray(built.vertices), axis=0).T)
+    assert abs(route["lengthM"] - float(steps.sum())) < 1e-6
+    assert route["chainage"][0] == 0 and len(route["chainage"]) == len(route["line"])
+    assert out["saved"]["line"] == line
+    assert out["noRoute"]
+
+    # ground 브라우저 길 = 서버 generate_sections(측점 · 횡단 · 종단)
+    grid_path = out["gridPath"]
+    assert out["gridCalls"] == 0
+    assert len(grid_path["stations"]) == len(expected["cross_sections"])
+    problems: list[str] = []
+    for ts, py in zip(grid_path["stations"], expected["cross_sections"], strict=True):
+        rows = _contract_rows(ts)
+        assert len(rows) == len(py["samples"])
+        for (offset, z), sample in zip(rows, py["samples"], strict=True):
+            if not (
+                _close(offset, sample["offset_m"], _TOL)
+                and _close(z, sample["z"] if sample["valid"] else None, _TOL)
+            ):
+                problems.append(f"측점 {py['chainage_m']} offset {sample['offset_m']}: {z}")
+        if not _close(ts["ground"]["centerZ"], py["center_z"], _TOL):
+            problems.append(f"측점 {py['chainage_m']} 중심 {ts['ground']['centerZ']}")
+    long_py = expected["longitudinal"]["samples"]
+    long_ts = grid_path["longitudinal"]
+    assert len(long_ts["z"]) == len(long_py)
+    for c, z, sample in zip(long_ts["chainageM"], long_ts["z"], long_py, strict=True):
+        if not (_close(c, sample["chainage_m"], _TOL) and _close(z, sample["z"], _TOL)):
+            problems.append(f"종단 {sample['chainage_m']}: {z}")
+    assert not problems, "\n".join(problems[:30])
+
+    # 서버 길 — 격자 받기 전 · 분석 지형 다름 · 값은 mm 자리로 같음
+    count = len(stations) * 81 + len(long_py)
+    assert out["serverCalls"] == [{"count": count, "terrain": None}]
+    assert out["sheetCalls"] == [{"count": count, "terrain": "sheet"}]
+    for ts, gs in zip(out["serverPath"]["stations"], grid_path["stations"], strict=True):
+        for (_o1, a), (_o2, b) in zip(_contract_rows(ts), _contract_rows(gs), strict=True):
+            assert _close(a, b, 5e-4)
+
+    # 범위 밖 재사용 — 다시 묻는 것 = 범위 안 측점 + 범위 밖이어도 자리가 바뀐 측점 하나
+    again = sum(1 for c in stations if c >= from_m) + 1
+    assert out["reuseCalls"] == [{"count": again * 81, "terrain": None}]
+    for ts, full in zip(out["reuse"]["stations"], out["movedFull"]["stations"], strict=True):
+        for (_o1, a), (_o2, b) in zip(_contract_rows(ts), _contract_rows(full), strict=True):
+            assert _close(a, b, 5e-4), f"재사용 값 다름 {ts['chainageM']}"
+    assert out["reuse"]["longitudinal"]["z"] == out["serverPath"]["longitudinal"]["z"]
+
+    # 한 번 전체 ground(검증_sub8 = 노선 1,078 m · 측점 55) — 0.3 s 예산 안 넉넉히
+    assert out["ms"] < 50, f"ground 단계 {out['ms']:.1f} ms"
+    print(f"ground 단계 {out['ms']:.2f} ms · 측점 {len(stations)} · 종단 {len(long_py)}")