fix(industrial): improve OSM review UX + public map visibility

Four UX issues surfaced when reviewing the new OSM-sync pipeline against
the actual 2,193 imports — fixed in this commit:

1. Admin queue surfaced noise first.
   `ListOsmPendingHandler` now sorts by `totalAreaHa DESC` (real KCN
   first, single-factory `landuse=industrial` polygons last) and accepts
   `minAreaHa` (default 50 ha) plus a `region` filter. The admin page
   exposes both as dropdowns — "Tất cả / ≥ 5 / ≥ 50 / ≥ 200 / ≥ 500 ha".
   Top-of-queue is now Bàu Bàng (2,597 ha) and Nhơn Trạch (2,535 ha).

2. Promote dialog said "KCN KCN Đại An" — duplicate prefix.
   Reworded to "Sắp promote: <name>" so the row name stands on its own.

3. Province was "Chưa xác định" on 2,107 of 2,193 OSM rows.
   The OSM tags lacked any addr:* hint, so the importer never had
   anything to write. Added `scripts/data/vn-province-centroids.ts` (63
   provinces with capital-city coords) and a `nearestProvince(lat, lng)`
   fallback in `parseFeature()`. Shipped a one-shot backfill script
   `scripts/backfill-osm-provinces.ts` and ran it — every existing OSM
   row now has a province (Hồ Chí Minh: 408, Lạng Sơn: 232,
   Quảng Ninh: 220, Hà Nội: 172, Hải Phòng: 105, …). Admin can correct
   on promote if the nearest-centroid heuristic picked the wrong
   neighbour for a long-thin province.

4. Public map looked empty — only 20 curated parks visible.
   Added an opt-in toggle "Hiển thị KCN OSM" with a small legend above
   the map. When on, the bbox endpoint returns OSM raw rows too; markers
   render in amber (vs. green for curated) at slightly smaller radius
   and lower opacity, so the visual hierarchy stays clear. Refetch is
   wired through a ref so the toggle takes effect without remounting
   the map.

Verified in browser preview: zoom-out shows clusters of 320 / 71 / etc.
across the country with the toggle on, and just three small clusters
(20 curated parks) when off.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/modules/industrial/application/queries/list-osm-pending/list-osm-pending.handler.ts

@@ -50,6 +50,10 @@ export class ListOsmPendingHandler implements IQueryHandler<ListOsmPendingQuery>
       conditions.push(`province = $${p++}`);
       values.push(q.province);
     }
+    if (q.region) {
+      conditions.push(`region::text = $${p++}`);
+      values.push(q.region);
+    }
     if (q.query) {
       conditions.push(
         `(name ILIKE $${p} OR "nameEn" ILIKE $${p} OR developer ILIKE $${p})`,
@@ -57,6 +61,13 @@ export class ListOsmPendingHandler implements IQueryHandler<ListOsmPendingQuery>
       values.push(`%${q.query}%`);
       p += 1;
     }
+    if (q.minAreaHa > 0) {
+      // Use COALESCE so rows whose area we couldn't compute (NODE-only
+      // imports) only show up when the admin explicitly drops the floor
+      // to 0.
+      conditions.push(`COALESCE("totalAreaHa", 0) >= $${p++}`);
+      values.push(q.minAreaHa);
+    }
     const where = conditions.join(' AND ');
 
     const [{ count }] = await this.prisma.$queryRawUnsafe<[{ count: bigint }]>(
@@ -95,7 +106,7 @@ export class ListOsmPendingHandler implements IQueryHandler<ListOsmPendingQuery>
         ST_Y(location::geometry) AS lat, ST_X(location::geometry) AS lng
        FROM "IndustrialPark"
        WHERE ${where}
-       ORDER BY "lastSyncedAt" DESC NULLS LAST, "totalAreaHa" DESC NULLS LAST
+       ORDER BY "totalAreaHa" DESC NULLS LAST, "lastSyncedAt" DESC NULLS LAST
        LIMIT $${p++} OFFSET $${p}`,
       ...values,
       limit,

apps/api/src/modules/industrial/application/queries/list-osm-pending/list-osm-pending.query.ts

@@ -1,6 +1,11 @@
 /**
  * Admin OSM review queue — list raw OSM-imported parks that haven't yet
  * been promoted to the public catalogue.
+ *
+ * `minAreaHa` lets admins skip the long tail of `landuse=industrial`
+ * features OSM tags that turn out to be single factories or warehouses
+ * (typically < 5 ha). The default of 50 ha surfaces "real" KCN first; pass
+ * `0` to see everything.
  */
 export class ListOsmPendingQuery {
   constructor(
@@ -8,5 +13,7 @@ export class ListOsmPendingQuery {
     public readonly limit: number = 50,
     public readonly query?: string,
     public readonly province?: string,
+    public readonly minAreaHa: number = 50,
+    public readonly region?: string,
   ) {}
 }

apps/api/src/modules/industrial/presentation/controllers/industrial-parks.controller.ts

@@ -302,6 +302,8 @@ export class IndustrialParksController {
     @Query('limit') limit?: string,
     @Query('q') q?: string,
     @Query('province') province?: string,
+    @Query('minAreaHa') minAreaHa?: string,
+    @Query('region') region?: string,
   ) {
     return this.queryBus.execute(
       new ListOsmPendingQuery(
@@ -309,6 +311,8 @@ export class IndustrialParksController {
         limit ? parseInt(limit, 10) : 50,
         q,
         province,
+        minAreaHa !== undefined ? Number(minAreaHa) : 50,
+        region,
       ),
     );
   }

apps/web/app/[locale]/(admin)/admin/industrial/osm-review/page.tsx

@@ -35,8 +35,10 @@ import {
 import { Link } from '@/i18n/navigation';
 import {
   industrialApi,
+  REGION_LABELS,
   type OsmPendingItem,
   type OsmPendingResult,
+  type VietnamRegion,
 } from '@/lib/khu-cong-nghiep-api';
 
 /**
@@ -56,6 +58,17 @@ import {
 
 const PAGE_SIZE = 50;
 
+/** Buckets for the "Diện tích tối thiểu" filter. 50 ha is the default
+ *  because most "real" KCN start there — anything below tends to be a
+ *  single factory or warehouse mistagged as `landuse=industrial`. */
+const MIN_AREA_OPTIONS: { value: number; label: string }[] = [
+  { value: 0, label: 'Tất cả' },
+  { value: 5, label: '≥ 5 ha' },
+  { value: 50, label: '≥ 50 ha (KCN nhỏ)' },
+  { value: 200, label: '≥ 200 ha (KCN lớn)' },
+  { value: 500, label: '≥ 500 ha (KCN trọng điểm)' },
+];
+
 const QUICK_LOCK_FIELDS: { key: string; label: string }[] = [
   { key: 'name', label: 'Tên KCN' },
   { key: 'developer', label: 'Chủ đầu tư' },
@@ -91,6 +104,8 @@ export default function AdminOsmReviewPage() {
   const [searchInput, setSearchInput] = useState('');
   const [search, setSearch] = useState('');
   const [provinceFilter, setProvinceFilter] = useState('');
+  const [minAreaHa, setMinAreaHa] = useState<number>(50);
+  const [region, setRegion] = useState<VietnamRegion | ''>('');
 
   // Promote dialog state
   const [promoteTarget, setPromoteTarget] = useState<OsmPendingItem | null>(null);
@@ -107,6 +122,8 @@ export default function AdminOsmReviewPage() {
         limit: PAGE_SIZE,
         q: search || undefined,
         province: provinceFilter || undefined,
+        minAreaHa,
+        region: region || undefined,
       });
       setResult(data);
     } catch (e) {
@@ -114,7 +131,7 @@ export default function AdminOsmReviewPage() {
     } finally {
       setLoading(false);
     }
-  }, [page, search, provinceFilter]);
+  }, [page, search, provinceFilter, minAreaHa, region]);
 
   useEffect(() => {
     fetchQueue();
@@ -218,6 +235,43 @@ export default function AdminOsmReviewPage() {
                 className="h-8 text-sm"
               />
             </div>
+            <div className="w-40">
+              <label className="mb-1 block text-xs text-foreground-dim">
+                Diện tích tối thiểu
+              </label>
+              <select
+                value={minAreaHa}
+                onChange={(e) => {
+                  setPage(1);
+                  setMinAreaHa(Number(e.target.value));
+                }}
+                className="h-8 w-full rounded-md border border-border bg-background px-2 text-sm"
+              >
+                {MIN_AREA_OPTIONS.map((o) => (
+                  <option key={o.value} value={o.value}>
+                    {o.label}
+                  </option>
+                ))}
+              </select>
+            </div>
+            <div className="w-32">
+              <label className="mb-1 block text-xs text-foreground-dim">Vùng miền</label>
+              <select
+                value={region}
+                onChange={(e) => {
+                  setPage(1);
+                  setRegion((e.target.value as VietnamRegion) || '');
+                }}
+                className="h-8 w-full rounded-md border border-border bg-background px-2 text-sm"
+              >
+                <option value="">Tất cả</option>
+                {(Object.keys(REGION_LABELS) as VietnamRegion[]).map((r) => (
+                  <option key={r} value={r}>
+                    {REGION_LABELS[r]}
+                  </option>
+                ))}
+              </select>
+            </div>
             <div className="w-40">
               <label className="mb-1 block text-xs text-foreground-dim">Tỉnh / TP</label>
               <Input
@@ -234,7 +288,7 @@ export default function AdminOsmReviewPage() {
               <Search className="mr-1.5 h-3.5 w-3.5" />
               Tìm
             </Button>
-            {(search || provinceFilter) && (
+            {(search || provinceFilter || region || minAreaHa !== 50) && (
               <Button
                 type="button"
                 size="sm"
@@ -243,11 +297,13 @@ export default function AdminOsmReviewPage() {
                   setSearchInput('');
                   setSearch('');
                   setProvinceFilter('');
+                  setRegion('');
+                  setMinAreaHa(50);
                   setPage(1);
                 }}
               >
                 <X className="mr-1 h-3 w-3" />
-                Xóa bộ lọc
+                Đặt lại
               </Button>
             )}
           </form>
@@ -444,8 +500,9 @@ export default function AdminOsmReviewPage() {
               <span className="flex items-start gap-2 text-sm">
                 <AlertTriangle className="mt-0.5 h-4 w-4 shrink-0" />
                 <span>
-                  KCN <strong>{promoteTarget?.name}</strong> sẽ được chuyển sang trạng thái public
-                  (OSM_PROMOTED). Chọn các trường muốn khóa để bảo vệ chúng khỏi OSM sync sau này.
+                  Sắp promote: <strong>{promoteTarget?.name}</strong>. KCN sẽ chuyển sang trạng thái
+                  public (OSM_PROMOTED). Chọn các trường muốn khóa để bảo vệ chúng khỏi OSM sync sau
+                  này.
                 </span>
               </span>
             </DialogDescription>

apps/web/app/[locale]/(public)/khu-cong-nghiep/page.tsx

@@ -2,6 +2,7 @@
 
 import { Factory, Map as MapIcon, List, Columns } from 'lucide-react';
 import * as React from 'react';
+import { OsmMapLegend } from '@/components/khu-cong-nghiep/osm-map-legend';
 import { OsmParkBboxMap } from '@/components/khu-cong-nghiep/osm-park-bbox-map';
 import { ParkCard } from '@/components/khu-cong-nghiep/park-card';
 import { ParkFilterBar } from '@/components/khu-cong-nghiep/park-filter-bar';
@@ -19,6 +20,10 @@ export default function KhuCongNghiepPage() {
     limit: PAGE_SIZE,
   });
   const [viewMode, setViewMode] = React.useState<ViewMode>('split');
+  // When true, the bbox map also shows raw OSM-imported parks (amber
+  // markers) on top of the curated catalog. Off by default — most users
+  // want only the verified set.
+  const [includeOsmRaw, setIncludeOsmRaw] = React.useState(false);
 
   const { data, isLoading, isError } = useIndustrialParksSearch(filters);
 
@@ -113,7 +118,16 @@ export default function KhuCongNghiepPage() {
 
             {/* Map-only view — bbox-driven, loads ALL parks in viewport */}
             {viewMode === 'map' && (
-              <OsmParkBboxMap className="h-[calc(100vh-260px)]" />
+              <>
+                <OsmMapLegend
+                  includeOsmRaw={includeOsmRaw}
+                  onToggleOsmRaw={setIncludeOsmRaw}
+                />
+                <OsmParkBboxMap
+                  className="h-[calc(100vh-300px)]"
+                  includeOsmRaw={includeOsmRaw}
+                />
+              </>
             )}
 
             {/* Split view: list left, sticky bbox map right (lg+ only) */}
@@ -126,8 +140,16 @@ export default function KhuCongNghiepPage() {
                     ))}
                   </div>
                 </div>
-                <div className="hidden lg:block">
-                  <OsmParkBboxMap className="sticky top-20 h-[calc(100vh-220px)]" />
+                <div className="hidden lg:flex lg:flex-col lg:gap-2">
+                  <OsmMapLegend
+                    includeOsmRaw={includeOsmRaw}
+                    onToggleOsmRaw={setIncludeOsmRaw}
+                    compact
+                  />
+                  <OsmParkBboxMap
+                    className="sticky top-20 h-[calc(100vh-260px)]"
+                    includeOsmRaw={includeOsmRaw}
+                  />
                 </div>
               </div>
             )}

apps/web/components/khu-cong-nghiep/osm-map-legend.tsx

@@ -0,0 +1,67 @@
+'use client';
+
+import { Info } from 'lucide-react';
+import * as React from 'react';
+
+interface OsmMapLegendProps {
+  includeOsmRaw: boolean;
+  onToggleOsmRaw: (value: boolean) => void;
+  /** Smaller variant for the split-view sidebar. */
+  compact?: boolean;
+}
+
+/**
+ * Legend + toggle that sits above the bbox map. Explains the two marker
+ * colors (curated vs raw OSM) and lets the user opt into showing the
+ * un-reviewed OpenStreetMap imports.
+ */
+export function OsmMapLegend({
+  includeOsmRaw,
+  onToggleOsmRaw,
+  compact = false,
+}: OsmMapLegendProps) {
+  return (
+    <div
+      className={`flex flex-wrap items-center gap-3 rounded-lg border bg-card ${
+        compact ? 'px-3 py-2 text-xs' : 'px-4 py-2.5 text-sm'
+      }`}
+      role="group"
+      aria-label="Chú giải bản đồ KCN"
+    >
+      <div className="flex items-center gap-1.5">
+        <span
+          className="inline-block h-3 w-3 rounded-full border-2 border-white shadow"
+          style={{ backgroundColor: '#22c55e' }}
+          aria-hidden="true"
+        />
+        <span className="text-foreground">KCN đã xác minh</span>
+      </div>
+      <div className="flex items-center gap-1.5">
+        <span
+          className="inline-block h-3 w-3 rounded-full border-2 border-white shadow opacity-70"
+          style={{ backgroundColor: '#f59e0b' }}
+          aria-hidden="true"
+        />
+        <span className="text-foreground">KCN từ OpenStreetMap (chưa duyệt)</span>
+      </div>
+
+      <label className="ml-auto flex cursor-pointer items-center gap-1.5 select-none">
+        <input
+          type="checkbox"
+          checked={includeOsmRaw}
+          onChange={(e) => onToggleOsmRaw(e.target.checked)}
+          className="rounded border-border"
+        />
+        <span>Hiển thị KCN OSM</span>
+      </label>
+
+      {includeOsmRaw && !compact && (
+        <p className="flex w-full items-center gap-1.5 border-t border-border pt-2 text-xs text-muted-foreground">
+          <Info className="h-3 w-3 shrink-0" />
+          KCN màu vàng là dữ liệu thô từ OpenStreetMap, chưa được kiểm duyệt — thông tin có thể chưa
+          chính xác hoặc thiếu.
+        </p>
+      )}
+    </div>
+  );
+}

apps/web/components/khu-cong-nghiep/osm-park-bbox-map.tsx

@@ -50,8 +50,12 @@ export function OsmParkBboxMap({
   // Capture the current includeOsmRaw value via a ref so the moveend
   // handler always sees the latest without re-binding the listener.
   const includeOsmRawRef = React.useRef(includeOsmRaw);
+  // Bumping this triggers a manual refetch when the toggle changes —
+  // the moveend handler alone doesn't fire on prop changes.
+  const refetchTokenRef = React.useRef<(() => void) | null>(null);
   React.useEffect(() => {
     includeOsmRawRef.current = includeOsmRaw;
+    refetchTokenRef.current?.();
   }, [includeOsmRaw]);
 
   React.useEffect(() => {
@@ -166,6 +170,8 @@ export function OsmParkBboxMap({
       });
 
       // Individual park markers (centroid Points) when not clustered.
+      // Color is data-driven: green = curated (MANUAL / OSM_PROMOTED),
+      // amber = raw OSM imports awaiting admin review.
       map.addLayer({
         id: POINT_LAYER_ID,
         type: 'circle',
@@ -176,10 +182,26 @@ export function OsmParkBboxMap({
           ['==', ['get', '_kind'], 'point'],
         ],
         paint: {
-          'circle-color': '#22c55e',
-          'circle-radius': 6,
+          'circle-color': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            '#f59e0b', // amber for raw OSM
+            '#22c55e', // green for curated
+          ],
+          'circle-radius': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            5,
+            6,
+          ],
           'circle-stroke-color': '#ffffff',
           'circle-stroke-width': 1.5,
+          'circle-opacity': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            0.7,
+            1,
+          ],
         },
       });
 
@@ -191,8 +213,18 @@ export function OsmParkBboxMap({
         source: SOURCE_ID,
         filter: ['==', ['get', '_kind'], 'polygon'],
         paint: {
-          'fill-color': '#22c55e',
-          'fill-opacity': 0.18,
+          'fill-color': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            '#f59e0b',
+            '#22c55e',
+          ],
+          'fill-opacity': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            0.1,
+            0.18,
+          ],
         },
       });
       map.addLayer({
@@ -201,9 +233,19 @@ export function OsmParkBboxMap({
         source: SOURCE_ID,
         filter: ['==', ['get', '_kind'], 'polygon'],
         paint: {
-          'line-color': '#22c55e',
+          'line-color': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            '#f59e0b',
+            '#22c55e',
+          ],
           'line-width': 2,
-          'line-opacity': 0.6,
+          'line-opacity': [
+            'case',
+            ['==', ['get', 'dataSource'], 'OSM'],
+            0.4,
+            0.6,
+          ],
         },
       });
 
@@ -250,6 +292,11 @@ export function OsmParkBboxMap({
 
       // Initial fetch + listen to viewport changes.
       void fetchParks();
+      // Wire up the prop-change refetch (used when `includeOsmRaw` flips
+      // — the moveend listener alone doesn't fire on parent re-renders).
+      refetchTokenRef.current = () => {
+        void fetchParks();
+      };
     });
 
     map.on('moveend', () => {

apps/web/lib/khu-cong-nghiep-api.ts

@@ -271,6 +271,9 @@ export interface ListOsmPendingParams {
   limit?: number;
   q?: string;
   province?: string;
+  /** Diện tích tối thiểu (ha). Default backend = 50 để lọc bớt nhà máy lẻ. */
+  minAreaHa?: number;
+  region?: VietnamRegion;
 }
 
 // ─── Labels ─────────────────────────────────────────────

scripts/backfill-osm-provinces.ts

@@ -0,0 +1,94 @@
+/**
+ * One-shot backfill for OSM-imported `IndustrialPark` rows whose
+ * `province` is "Chưa xác định" (the placeholder we wrote when the OSM
+ * tags lacked any addr:* hints).
+ *
+ *   Usage:
+ *     NODE_OPTIONS="-r dotenv/config" DOTENV_CONFIG_PATH=.env \
+ *       pnpm tsx scripts/backfill-osm-provinces.ts [--dry-run]
+ *
+ *   What it does:
+ *     1. Selects every row where dataSource = 'OSM' AND province =
+ *        'Chưa xác định'.
+ *     2. Reads the centroid via ST_X / ST_Y from the `location` Point.
+ *     3. Looks up the nearest province from VN_PROVINCE_CENTROIDS.
+ *     4. Updates the row in batches.
+ *
+ *   Safe to re-run: skips rows where province is already filled in.
+ */
+import 'dotenv/config';
+import { PrismaPg } from '@prisma/adapter-pg';
+import { PrismaClient } from '@prisma/client';
+import pg from 'pg';
+import { nearestProvince } from './data/vn-province-centroids';
+
+const pool = new pg.Pool({ connectionString: process.env['DATABASE_URL'] });
+const adapter = new PrismaPg(pool);
+const prisma = new PrismaClient({ adapter });
+
+const dryRun = process.argv.includes('--dry-run');
+
+interface Row {
+  id: string;
+  lat: number;
+  lng: number;
+}
+
+async function main(): Promise<void> {
+  console.log('🔍 Finding OSM rows with province="Chưa xác định"…');
+
+  const rows = await prisma.$queryRawUnsafe<Row[]>(
+    `SELECT id, ST_Y(location::geometry) AS lat, ST_X(location::geometry) AS lng
+     FROM "IndustrialPark"
+     WHERE "dataSource"::text = 'OSM' AND province = 'Chưa xác định'`,
+  );
+  console.log(`  → ${rows.length} rows need a province.`);
+
+  if (!rows.length) {
+    console.log('✓ Nothing to do.');
+    return;
+  }
+
+  const updates = new Map<string, string[]>();
+  for (const row of rows) {
+    const province = nearestProvince(row.lat, row.lng);
+    if (!updates.has(province)) updates.set(province, []);
+    updates.get(province)!.push(row.id);
+  }
+
+  // Sort by impact for the dry-run preview.
+  const summary = Array.from(updates.entries()).sort((a, b) => b[1].length - a[1].length);
+  console.log('  → Distribution by inferred province:');
+  for (const [province, ids] of summary) {
+    console.log(`     ${province.padEnd(24)} ${ids.length}`);
+  }
+
+  if (dryRun) {
+    console.log('💡 --dry-run: no writes performed.');
+    return;
+  }
+
+  let totalUpdated = 0;
+  for (const [province, ids] of updates) {
+    // UPDATE in batches of 500 ids to avoid huge IN-lists.
+    for (let i = 0; i < ids.length; i += 500) {
+      const batch = ids.slice(i, i + 500);
+      const result = await prisma.industrialPark.updateMany({
+        where: { id: { in: batch } },
+        data: { province },
+      });
+      totalUpdated += result.count;
+    }
+  }
+  console.log(`✓ Updated ${totalUpdated} rows.`);
+}
+
+main()
+  .catch((err) => {
+    console.error(err);
+    process.exitCode = 1;
+  })
+  .finally(async () => {
+    await prisma.$disconnect();
+    await pool.end();
+  });

scripts/data/vn-province-centroids.ts

@@ -0,0 +1,107 @@
+/**
+ * Approximate centroids for Vietnam's 63 provinces / centrally-administered
+ * cities, used as a fallback when OSM `addr:state` / `addr:province` tags
+ * are missing (which is the common case for industrial-park polygons in VN).
+ *
+ * The coords are public-domain capital-city centroids (good enough for a
+ * "which province does this point land in?" nearest-neighbour lookup at
+ * the +/- few-km level — the long shape of some provinces means the
+ * nearest centroid will occasionally pick the wrong neighbour, but admin
+ * can correct on promote.
+ *
+ * Province name canonical form = display name in Vietnamese (no diacritics
+ * stripped) so it matches what the seed data + UI already uses.
+ */
+
+export interface ProvinceCentroid {
+  name: string;
+  lat: number;
+  lng: number;
+}
+
+export const VN_PROVINCE_CENTROIDS: ProvinceCentroid[] = [
+  { name: 'Hà Nội', lat: 21.028511, lng: 105.804817 },
+  { name: 'Hồ Chí Minh', lat: 10.762622, lng: 106.660172 },
+  { name: 'Hải Phòng', lat: 20.844912, lng: 106.688084 },
+  { name: 'Đà Nẵng', lat: 16.054407, lng: 108.202167 },
+  { name: 'Cần Thơ', lat: 10.045162, lng: 105.746857 },
+  { name: 'An Giang', lat: 10.521583, lng: 105.125896 },
+  { name: 'Bà Rịa - Vũng Tàu', lat: 10.541136, lng: 107.242851 },
+  { name: 'Bạc Liêu', lat: 9.294085, lng: 105.721787 },
+  { name: 'Bắc Giang', lat: 21.281932, lng: 106.197658 },
+  { name: 'Bắc Kạn', lat: 22.147291, lng: 105.834160 },
+  { name: 'Bắc Ninh', lat: 21.186080, lng: 106.076371 },
+  { name: 'Bến Tre', lat: 10.243519, lng: 106.375140 },
+  { name: 'Bình Dương', lat: 11.325237, lng: 106.477017 },
+  { name: 'Bình Định', lat: 13.782250, lng: 109.219574 },
+  { name: 'Bình Phước', lat: 11.751888, lng: 106.723917 },
+  { name: 'Bình Thuận', lat: 11.090668, lng: 108.072094 },
+  { name: 'Cà Mau', lat: 9.176790, lng: 105.150253 },
+  { name: 'Cao Bằng', lat: 22.665684, lng: 106.257549 },
+  { name: 'Đắk Lắk', lat: 12.710017, lng: 108.237633 },
+  { name: 'Đắk Nông', lat: 12.264144, lng: 107.609794 },
+  { name: 'Điện Biên', lat: 21.386073, lng: 103.016510 },
+  { name: 'Đồng Nai', lat: 11.066000, lng: 107.166700 },
+  { name: 'Đồng Tháp', lat: 10.493333, lng: 105.688200 },
+  { name: 'Gia Lai', lat: 13.808078, lng: 108.109375 },
+  { name: 'Hà Giang', lat: 22.823453, lng: 104.978573 },
+  { name: 'Hà Nam', lat: 20.541127, lng: 105.913303 },
+  { name: 'Hà Tĩnh', lat: 18.342745, lng: 105.905499 },
+  { name: 'Hải Dương', lat: 20.940981, lng: 106.330156 },
+  { name: 'Hậu Giang', lat: 9.757897, lng: 105.641110 },
+  { name: 'Hòa Bình', lat: 20.817192, lng: 105.337720 },
+  { name: 'Hưng Yên', lat: 20.852241, lng: 106.015511 },
+  { name: 'Khánh Hòa', lat: 12.258515, lng: 109.052528 },
+  { name: 'Kiên Giang', lat: 10.012103, lng: 105.080921 },
+  { name: 'Kon Tum', lat: 14.349953, lng: 108.000534 },
+  { name: 'Lai Châu', lat: 22.396519, lng: 103.471370 },
+  { name: 'Lâm Đồng', lat: 11.940419, lng: 108.458313 },
+  { name: 'Lạng Sơn', lat: 21.853708, lng: 106.761525 },
+  { name: 'Lào Cai', lat: 22.485198, lng: 103.974845 },
+  { name: 'Long An', lat: 10.535359, lng: 106.405460 },
+  { name: 'Nam Định', lat: 20.438822, lng: 106.162106 },
+  { name: 'Nghệ An', lat: 18.679585, lng: 105.681753 },
+  { name: 'Ninh Bình', lat: 20.250716, lng: 105.974623 },
+  { name: 'Ninh Thuận', lat: 11.673911, lng: 108.864225 },
+  { name: 'Phú Thọ', lat: 21.398716, lng: 105.151787 },
+  { name: 'Phú Yên', lat: 13.088067, lng: 109.092876 },
+  { name: 'Quảng Bình', lat: 17.478366, lng: 106.621288 },
+  { name: 'Quảng Nam', lat: 15.539353, lng: 108.019047 },
+  { name: 'Quảng Ngãi', lat: 15.120137, lng: 108.804340 },
+  { name: 'Quảng Ninh', lat: 21.006382, lng: 107.292514 },
+  { name: 'Quảng Trị', lat: 16.745360, lng: 107.187462 },
+  { name: 'Sóc Trăng', lat: 9.602522, lng: 105.973797 },
+  { name: 'Sơn La', lat: 21.328228, lng: 103.914400 },
+  { name: 'Tây Ninh', lat: 11.310300, lng: 106.098046 },
+  { name: 'Thái Bình', lat: 20.446016, lng: 106.336445 },
+  { name: 'Thái Nguyên', lat: 21.594280, lng: 105.844866 },
+  { name: 'Thanh Hóa', lat: 19.806692, lng: 105.785182 },
+  { name: 'Thừa Thiên Huế', lat: 16.467397, lng: 107.590533 },
+  { name: 'Tiền Giang', lat: 10.449334, lng: 106.342120 },
+  { name: 'Trà Vinh', lat: 9.812741, lng: 106.299250 },
+  { name: 'Tuyên Quang', lat: 21.778812, lng: 105.218015 },
+  { name: 'Vĩnh Long', lat: 10.253938, lng: 105.972456 },
+  { name: 'Vĩnh Phúc', lat: 21.308690, lng: 105.604813 },
+  { name: 'Yên Bái', lat: 21.722733, lng: 104.911289 },
+];
+
+/**
+ * Find the nearest province centroid for a given lat/lng. Uses naive squared
+ * distance — fine for VN's ~1500-km north-south extent. Always returns a
+ * province (the dataset covers the country); callers can fall back to
+ * "Chưa xác định" if they need to.
+ */
+export function nearestProvince(lat: number, lng: number): string {
+  let best = VN_PROVINCE_CENTROIDS[0];
+  let bestD = Infinity;
+  for (const p of VN_PROVINCE_CENTROIDS) {
+    const dLat = lat - p.lat;
+    const dLng = lng - p.lng;
+    const d = dLat * dLat + dLng * dLng;
+    if (d < bestD) {
+      bestD = d;
+      best = p;
+    }
+  }
+  return best.name;
+}

scripts/sync-osm-industrial-parks.ts

@@ -25,13 +25,14 @@
  */
 import 'dotenv/config';
 import { createId } from '@paralleldrive/cuid2';
-import area from '@turf/area';
-import centroid from '@turf/centroid';
 import { PrismaPg } from '@prisma/adapter-pg';
 import { type Prisma, PrismaClient } from '@prisma/client';
+import area from '@turf/area';
+import centroid from '@turf/centroid';
 import type { Feature, MultiPolygon, Polygon, Point } from 'geojson';
 import osmtogeojson from 'osmtogeojson';
 import pg from 'pg';
+import { nearestProvince } from './data/vn-province-centroids';
 
 const generateCuid = (): Promise<string> => Promise.resolve(createId());
 
@@ -200,10 +201,14 @@ function parseFeature(
     totalAreaHa = Math.round((area(feat as Feature) / 10000) * 100) / 100;
   }
 
+  // Province resolution: prefer explicit OSM tags, then fall back to a
+  // nearest-centroid lookup against our 63-province table. The fallback
+  // catches the (very common) case where Vietnamese landuse polygons have
+  // no addr:* tags at all.
   const province =
     VN_PROVINCE_HINTS.map((k) => tags[k]).find(Boolean) ??
     tags['addr:city'] ??
-    'Chưa xác định';
+    nearestProvince(cLat, cLng);
   const district = tags['addr:district'] ?? tags['addr:suburb'] ?? '';
   const address =
     tags['addr:full'] ??