Filter invalid NMC wind placeholders from map labels

frontend/hooks/useLeafletMap.ts

@@ -78,6 +78,11 @@ function createMarkerIcon(
 }
 
 function buildNearbyIconHtml(detail: CityDetail, station: NearbyStation) {
+  const sanitizeWindText = (value?: string | null) => {
+    const text = String(value || "").trim();
+    if (!text || text === "9999") return "";
+    return text;
+  };
   const symbol = detail.temp_symbol || "°C";
   const rawLabel =
     station.station_label ||
@@ -92,8 +97,8 @@ function buildNearbyIconHtml(detail: CityDetail, station: NearbyStation) {
       ? String(rawLabel).replace(/\s*\(NMC\)$/i, "区域实况 (NMC)")
       : rawLabel;
   let windHtml = "";
-  const windDirectionText = String(station.wind_direction_text || "").trim();
+  const windDirectionText = sanitizeWindText(station.wind_direction_text);
-  const windPowerText = String(station.wind_power_text || "").trim();
+  const windPowerText = sanitizeWindText(station.wind_power_text);
 
   if (station.wind_dir != null) {
     const rotation = (Number(station.wind_dir) + 180) % 360;

src/data_collection/nmc_sources.py

@@ -45,6 +45,13 @@ NMC_CITY_REFERENCES: Dict[str, Dict[str, Any]] = {
 
 
 class NmcSourceMixin:
+    @staticmethod
+    def _nmc_optional_text(value: Any) -> Optional[str]:
+        text = str(value or "").strip()
+        if text in ("", "9999"):
+            return None
+        return text
+
     @staticmethod
     def _nmc_optional_float(value: Any) -> Optional[float]:
         if value in (None, "", "9999", 9999, 9999.0):
@@ -138,8 +145,8 @@ class NmcSourceMixin:
                     "rain": self._nmc_optional_float(weather.get("rain")),
                     "airpressure": self._nmc_optional_float(weather.get("airpressure")),
                     "wx_desc": weather.get("info"),
-                    "wind_direction": (payload.get("wind") or {}).get("direct"),
+                    "wind_direction": self._nmc_optional_text((payload.get("wind") or {}).get("direct")),
-                    "wind_power": (payload.get("wind") or {}).get("power"),
+                    "wind_power": self._nmc_optional_text((payload.get("wind") or {}).get("power")),
                 },
             }
             with self._nmc_cache_lock: