WP1.9: Add public transport accessibility indicator (SDG 11.2.1)

.gitignore

@@ -25,3 +25,6 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+
+# Local PT accessibility merge input (generated locally, do not commit)
+preprocessing/public-transport-accessibility/cities_with_pt_access.csv

preprocess.ipynb

@@ -370,6 +370,8 @@
    "source": [
     "cities = pd.read_json('public/cities.json', orient='records')\n",
     "\n",
+    "\n",
+    "\n",
     "cities_europe_candidates = [Path('public/cities_europe.json'), Path('cities_europe.json')]\n",
     "cities_europe_path = next((path for path in cities_europe_candidates if path.exists()), None)\n",
     "if cities_europe_path is not None:\n",
@@ -458,6 +460,34 @@
     "            cities = pd.merge(cities, cities_europe[eu_merge_cols], on='id', how='left')\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "pt-access-merge",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "pt_access = pd.read_csv(\n",
+    "    Path('preprocessing/public-transport-accessibility/cities_with_pt_access.csv'),\n",
+    "    usecols=['id', 'SDG1121pct'],\n",
+    ")\n",
+    "pt_access = pt_access.rename(columns={'SDG1121pct': 'public_transport_accessibility'})\n",
+    "pt_access['id'] = pd.to_numeric(pt_access['id'], errors='coerce')\n",
+    "pt_access['public_transport_accessibility'] = pd.to_numeric(\n",
+    "    pt_access['public_transport_accessibility'], errors='coerce'\n",
+    ")\n",
+    "pt_access = pt_access.dropna(subset=['id'])\n",
+    "pt_access['id'] = pt_access['id'].astype(int)\n",
+    "pt_access = pt_access[['id', 'public_transport_accessibility']]\n",
+    "\n",
+    "cities['id'] = pd.to_numeric(cities['id'], errors='coerce')\n",
+    "cities = cities.dropna(subset=['id'])\n",
+    "cities['id'] = cities['id'].astype(int)\n",
+    "\n",
+    "cities = cities.drop(columns=['public_transport_accessibility'], errors='ignore')\n",
+    "cities = pd.merge(cities, pt_access, on='id', how='left')\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 44,
@@ -589,6 +619,7 @@
     "    'hdi',\n",
     "    'female_gender_index',\n",
     "    'emissions',\n",
+    "    'public_transport_accessibility',\n",
     "]\n",
     "\n",
     "for col in metric_cols:\n",
@@ -707,4 +738,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}

preprocessing/public-transport-accessibility/README.md

@@ -0,0 +1,16 @@
+# Public transport accessibility one-off preprocessing
+
+This folder archives the one-off preprocessing artifacts used to add SDG 11.2.1
+(urban access to public transport) into the explorer dataset.
+
+Included artifacts:
+- `city-mapping-SDG-PT-2026-05-19.ipynb`: matching workflow notebook.
+
+The matched CSV (`cities_with_pt_access.csv`) is intentionally **not** stored in
+the repository because its integrated values are already persisted in
+`public/cities.json`.
+
+Primary source citation:
+- Center For International Earth Science Information Network (CIESIN), Columbia University (2023).
+  *SDG Indicator 11.2.1: Urban Access to Public Transport, 2023 Release*.
+  https://doi.org/10.7927/1A5Z-3H71

src/components/InfoPanel.jsx

@@ -173,6 +173,9 @@ const InfoPanel = ({ selectedSample, samples, setSelectedSample, setSearchValue
           <p>
             Metrics are sourced from the <a href="https://human-settlement.emergency.copernicus.eu/ghs_ucdb_2024.php" target="_blank" rel="noopener noreferrer"> Global Human Settlement Layer (GHSL)</a> and related datasets.
           </p>
+          <p>
+            Public transport accessibility is based on SDG indicator 11.2.1 from <a href="https://doi.org/10.7927/1A5Z-3H71" target="_blank" rel="noopener noreferrer">CIESIN (2023)</a>.
+          </p>
           <p>
             Percentile ranks indicate the share of cities worldwide that have lower values, showing how each city compares to its global peers for each characteristic.
           </p>

src/utils/metrics.js

@@ -9,6 +9,7 @@ export const metricList = [
   { key: "hdd", label: "Heating Degree Days", unit: "°C", decimals: -1 },
   { key: "cdd", label: "Cooling Degree Days", unit: "°C", decimals: -1 },
   { key: "critical_infrastructure", label: "Critical infrastructure index", decimals: 2 },
+  { key: "public_transport_accessibility", label: "Public transport accessibility (SDG 11.2.1)", unit: "%", decimals: 1 },
   { key: "female_gender_index", label: "Female gender index", decimals: 2 },
   { key: "hdi", label: "Human development index", decimals: 2 },
   { key: "emissions", label: "GHG emissions", unit: "tCO₂e/cap", decimals: 2 },