Fix Agency cadastral WMS coordinate system

wwwroot/js/lme-map.js

@@ -26,6 +26,10 @@ const lmeState = {
     azureAttribution: null
 };
 
+// AdE publishes the cadastral WMS in ETRS89. WMS 1.1.1 keeps the longitude,
+// latitude BBOX order expected by Leaflet while sending the required CRS code.
+const cadastreCrs = L.extend({}, L.CRS.EPSG4326, { code: "EPSG:4258" });
+
 window.lmeMap = {
     init,
     showSearchResult,
@@ -291,7 +295,10 @@ function exportCadastreView() {
         previewMap.hidden = false;
         const highlightedCount = lmeState.selectedParcelsLayer.getLayers().length
             + lmeState.gpsParcelLayer.getLayers().length;
-        setInfo(`Vista WMS caricata con ${layers.length} layer e ${highlightedCount} particelle evidenziate.`);
+        const zoomHint = layers.includes("codice_plla") && lmeState.map.getZoom() < 17
+            ? " Ingrandisci almeno fino a zoom 17 per leggere i numeri delle particelle."
+            : "";
+        setInfo(`Vista WMS caricata con ${layers.length} layer e ${highlightedCount} particelle evidenziate.${zoomHint}`);
     };
     image.onerror = () => {
         previewMap.hidden = true;
@@ -782,16 +789,31 @@ function refreshCadastreLayer() {
         return;
     }
 
-    lmeState.cadastre = L.tileLayer.wms(cadastreUrl(), {
+    const cadastreLayer = L.tileLayer.wms(cadastreUrl(), {
         layers: layers.join(","),
         format: "image/png",
         transparent: true,
-        version: "1.3.0",
-        crs: L.CRS.EPSG4326,
+        version: "1.1.1",
+        crs: cadastreCrs,
         maxZoom: 22,
         opacity: lmeState.cadastreOpacity,
         attribution: "Agenzia delle Entrate - CC BY 4.0"
-    }).addTo(lmeState.map);
+    });
+
+    let errorShown = false;
+    cadastreLayer.on("tileerror", () => {
+        if (errorShown) {
+            return;
+        }
+
+        errorShown = true;
+        setInfo("Layer catastali non caricati dal servizio AdE. Controlla la connessione e riprova.");
+    });
+    cadastreLayer.on("load", () => {
+        errorShown = false;
+    });
+
+    lmeState.cadastre = cadastreLayer.addTo(lmeState.map);
 }
 
 function activeCadastreLayers() {