Overlay selected parcels on WMS preview

Components/Pages/Home.razor

@@ -18,7 +18,16 @@
                 <strong>LME Catasto</strong>
                 <span>@Status</span>
             </div>
-            <button class="toolbar-button" @onclick='() => SelectTab(ActiveTab == "search" ? "map" : "search")'>Cerca</button>
+            <div class="toolbar-actions">
+                <button class="toolbar-button layer-button @(LayerPanelOpen ? "is-active" : null)"
+                        title="Layer catastali"
+                        aria-expanded="@LayerPanelOpen"
+                        @onclick="ToggleLayerPanel">
+                    <span class="layer-symbol" aria-hidden="true"></span>
+                    <span>Layer</span>
+                </button>
+                <button class="toolbar-button" @onclick='() => SelectTab(ActiveTab == "search" ? "map" : "search")'>Cerca</button>
+            </div>
         </header>
 
         <div class="map-search @(ActiveTab == "search" ? "is-open" : null)">
@@ -26,6 +35,33 @@
             <button @onclick="SearchLocation">Vai</button>
         </div>
 
+        @if (LayerPanelOpen)
+        {
+            <section class="map-layer-panel" aria-label="Layer catastali">
+                <header>
+                    <strong>Layer catastali</strong>
+                    <button class="layer-panel-close" aria-label="Chiudi layer" @onclick="ToggleLayerPanel">×</button>
+                </header>
+                @foreach (var layer in CadastralLayers)
+                {
+                    <label class="map-layer-option">
+                        <input type="checkbox" checked="@layer.Enabled" @onchange="(args) => ToggleCadastreLayer(layer, args)" />
+                        <span>
+                            <strong>@layer.Name</strong>
+                            @if (!string.IsNullOrWhiteSpace(layer.Detail))
+                            {
+                                <small>@layer.Detail</small>
+                            }
+                        </span>
+                    </label>
+                }
+                <div class="layer-panel-actions">
+                    <button class="secondary-command" @onclick="ClearSelectedParcels">Rimuovi particelle selezionate</button>
+                    <button class="danger-command" @onclick="ClearMapElements">Pulisci elementi mappa</button>
+                </div>
+            </section>
+        }
+
         <div class="gps-overlay @(ActiveTab == "search" ? "search-open" : null)">
             <div class="gps-state">
                 <span id="gpsState">GPS non attivo</span>
@@ -178,16 +214,6 @@
                             Trasparenza catasto
                             <input type="range" min="0" max="1" step="0.05" value="0.75" @onchange="ChangeCadastreOpacity" />
                         </label>
-                        <div class="layer-toggles">
-                            @foreach (var layer in CadastralLayers)
-                            {
-                                <label>
-                                    <input type="checkbox" checked="@layer.Enabled" @onchange="(args) => ToggleCadastreLayer(layer.Key, args)" />
-                                    @layer.Name
-                                </label>
-                            }
-                        </div>
-
                         <h2>GPS e percorso</h2>
                         <label class="toggle-line">
                             <input type="checkbox" checked="@TrailEnabled" @onchange="ToggleTrail" />
@@ -202,7 +228,7 @@
                             <button class="secondary-command" @onclick="OpenOfficialReservedArea">Apri Area riservata per download</button>
                         </div>
 
-                        <button class="secondary-command" @onclick="ExportCadastralImage">Apri vista WMS corrente</button>
+                        <button class="secondary-command" @onclick="ExportCadastralImage">Mostra vista WMS corrente</button>
                         <footer>Dati catastali: Agenzia delle Entrate, licenza CC BY 4.0. App indipendente.</footer>
                     </section>
                 }
@@ -211,6 +237,25 @@
 
         <div id="mapInfo" class="map-info">Pronto</div>
 
+        <div id="wmsPreview" class="wms-preview" hidden>
+            <section class="wms-preview-dialog" role="dialog" aria-modal="true" aria-labelledby="wmsPreviewTitle">
+                <header>
+                    <div>
+                        <strong id="wmsPreviewTitle">Vista WMS catastale</strong>
+                        <small>Immagine ufficiale AdE con le particelle evidenziate dall'app</small>
+                    </div>
+                    <button id="closeWmsPreview" class="close-button" aria-label="Chiudi vista WMS">×</button>
+                </header>
+                <div class="wms-preview-body">
+                    <span id="wmsPreviewLoading">Caricamento...</span>
+                    <div id="wmsPreviewMap" class="wms-preview-map" hidden>
+                        <img id="wmsPreviewImage" alt="Vista WMS catastale dell'area corrente" />
+                        <svg id="wmsPreviewOverlay" aria-hidden="true" preserveAspectRatio="none"></svg>
+                    </div>
+                </div>
+            </section>
+        </div>
+
         <nav class="bottom-tabs" aria-label="Sezioni principali">
             <button class="@(ActiveTab == "map" || ActiveTab == "search" ? "active" : null)" @onclick='() => SelectTab("map")'>Mappa</button>
             <button class="@(ActiveTab == "cadastre" ? "active" : null)" @onclick='() => SelectTab("cadastre")'>Catasto</button>
@@ -238,6 +283,7 @@
     private bool GpsActive { get; set; }
     private bool DrawToolsVisible { get; set; }
     private bool TrailEnabled { get; set; }
+    private bool LayerPanelOpen { get; set; }
     private CancellationTokenSource? CatalogCancellation { get; set; }
     private CancellationTokenSource? GpsLookupCancellation { get; set; }
     private long LastGpsLookupAt;
@@ -272,11 +318,11 @@
 
     private readonly List<CadastralLayer> CadastralLayers =
     [
-        new("CP.CadastralParcel", "Particelle", true),
+        new("CP.CadastralParcel", "Confini particelle", true),
-        new("codice_plla", "Numeri particelle", true),
+        new("codice_plla", "Numeri particelle", true, "Visibili circa da zoom 17"),
-        new("CP.CadastralZoning", "Fogli", true),
+        new("CP.CadastralZoning", "Fogli catastali", true),
         new("fabbricati", "Fabbricati", true),
-        new("strade", "Strade", false),
+        new("strade", "Strade catastali", false),
         new("acque", "Acque", false)
     ];
 
@@ -321,6 +367,22 @@
     private async Task SelectTab(string tab)
     {
         ActiveTab = tab;
+        if (tab != "map")
+        {
+            LayerPanelOpen = false;
+        }
+        await Task.Delay(30);
+        await JS.InvokeVoidAsync("lmeMap.resize");
+    }
+
+    private async Task ToggleLayerPanel()
+    {
+        LayerPanelOpen = !LayerPanelOpen;
+        if (LayerPanelOpen)
+        {
+            ActiveTab = "map";
+        }
+
         await Task.Delay(30);
         await JS.InvokeVoidAsync("lmeMap.resize");
     }
@@ -711,8 +773,25 @@
         }
     }
     private Task ChangeCadastreOpacity(ChangeEventArgs args) => JS.InvokeVoidAsync("lmeMap.setCadastreOpacity", args.Value?.ToString()).AsTask();
-    private Task ToggleCadastreLayer(string layer, ChangeEventArgs args) => JS.InvokeVoidAsync("lmeMap.toggleCadastreLayer", layer, (bool?)args.Value == true).AsTask();
+
-    private Task ExportCadastralImage() => JS.InvokeVoidAsync("lmeMap.exportCadastreView").AsTask();
+    private async Task ToggleCadastreLayer(CadastralLayer layer, ChangeEventArgs args)
+    {
+        layer.Enabled = args.Value is true;
+        await JS.InvokeVoidAsync("lmeMap.toggleCadastreLayer", layer.Key, layer.Enabled);
+    }
+
+    private async Task ExportCadastralImage()
+    {
+        ActiveTab = "map";
+        LayerPanelOpen = false;
+        await Task.Delay(30);
+        await JS.InvokeVoidAsync("lmeMap.resize");
+        await JS.InvokeVoidAsync("lmeMap.exportCadastreView");
+    }
+
+    private Task ClearSelectedParcels() => JS.InvokeVoidAsync("lmeMap.clearSelectedParcels").AsTask();
+
+    private Task ClearMapElements() => JS.InvokeVoidAsync("lmeMap.clearMapElements").AsTask();
 
     private Task OpenOfficialGeoportal() => Microsoft.Maui.ApplicationModel.Launcher.Default.OpenAsync(
         new Uri("https://geoportale.cartografia.agenziaentrate.gov.it/"));
@@ -720,7 +799,13 @@
     private Task OpenOfficialReservedArea() => Microsoft.Maui.ApplicationModel.Launcher.Default.OpenAsync(
         new Uri("https://www.agenziaentrate.gov.it/portale/area-riservata"));
 
-    private sealed record CadastralLayer(string Key, string Name, bool Enabled);
+    private sealed class CadastralLayer(string key, string name, bool enabled, string detail = "")
+    {
+        public string Key { get; } = key;
+        public string Name { get; } = name;
+        public bool Enabled { get; set; } = enabled;
+        public string Detail { get; } = detail;
+    }
 
     public ValueTask DisposeAsync()
     {

LMEMappeCatastaliApp.csproj

@@ -28,8 +28,8 @@
         <ApplicationId>com.companyname.lmemappecatastaliapp</ApplicationId>
 
         <!-- Versions -->
-        <ApplicationDisplayVersion>0.2.3</ApplicationDisplayVersion>
+        <ApplicationDisplayVersion>0.2.5</ApplicationDisplayVersion>
-        <ApplicationVersion>7</ApplicationVersion>
+        <ApplicationVersion>9</ApplicationVersion>
 
         <!-- To develop, package, and publish an app to the Microsoft Store, see: https://aka.ms/MauiTemplateUnpackaged -->
         <WindowsPackageType>None</WindowsPackageType>

README.md

@@ -24,6 +24,11 @@ App .NET MAUI Blazor Hybrid per Android, iOS, Mac Catalyst e Windows, pensata pe
 - Catalogo dei Comuni incluso nell'APK e cataloghi regionali OnData scaricati in cache solo quando servono.
 - Ricerca catastale eseguita dal codice .NET nativo, senza DuckDB WebAssembly nella WebView Android.
 - La registrazione della traccia GPS e' disattivata all'avvio; la toolbar di disegno puo' essere mostrata o nascosta dal tab Progetti.
+- Pannello `Layer` accessibile direttamente dalla mappa, con checkbox sincronizzati per confini, numeri particella, fogli, fabbricati, strade e acque.
+- Le particelle cercate possono essere aggiunte una dopo l'altra, mantenendo contemporaneamente sulla mappa tutti i confini selezionati.
+- Comandi separati per rimuovere le particelle selezionate o pulire importazioni, disegni, POI e traccia GPS.
+- Anteprima WMS ufficiale mostrata dentro l'app senza aprire una nuova finestra Android.
+- Confini delle particelle selezionate e della particella GPS sovrapposti anche all'anteprima WMS corrente.
 - Collegamenti separati al Geoportale pubblico e all'Area riservata AdE per CAPTCHA, SPID/CIE e download ufficiali.
 
 ## Limite ufficiale AdE da considerare

Services/AzureMapsService.cs

@@ -13,7 +13,7 @@ public sealed class AzureMapsService
 
     public AzureMapsService()
     {
-        _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("LMEMappeCatastali/0.2.3");
+        _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("LMEMappeCatastali/0.2.5");
         _httpClient.DefaultRequestHeaders.Accept.ParseAdd("application/json");
     }
 

wwwroot/css/app.css

@@ -124,6 +124,28 @@ input[type="checkbox"] {
     color: var(--ink);
 }
 
+.toolbar-actions,
+.layer-button {
+    display: flex;
+    align-items: center;
+    gap: 7px;
+}
+
+.toolbar-actions {
+    flex: 0 0 auto;
+}
+
+.layer-button.is-active {
+    background: #ccebe3;
+    color: var(--accent-strong);
+}
+
+.layer-symbol {
+    width: 20px;
+    height: 20px;
+    background: url("../lib/leaflet/images/layers.png") center / contain no-repeat;
+}
+
 .map-search {
     position: absolute;
     top: 72px;
@@ -150,6 +172,73 @@ input[type="checkbox"] {
     transform: translateY(0);
 }
 
+.map-layer-panel {
+    position: absolute;
+    top: 72px;
+    right: 12px;
+    z-index: 940;
+    display: grid;
+    width: min(320px, calc(100% - 24px));
+    max-height: calc(100% - 152px);
+    overflow-y: auto;
+    border: 1px solid var(--line);
+    border-radius: 8px;
+    padding: 9px;
+    background: rgba(255, 255, 255, 0.98);
+    box-shadow: 0 3px 14px rgba(0, 0, 0, 0.22);
+}
+
+.map-layer-panel > header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 10px;
+    padding: 0 0 7px 4px;
+    border-bottom: 1px solid var(--line);
+}
+
+.layer-panel-close {
+    width: 36px;
+    min-width: 36px;
+    min-height: 34px;
+    padding: 0;
+    background: #e9eef0;
+    color: var(--ink);
+    font-size: 23px;
+}
+
+.map-layer-option {
+    display: flex;
+    align-items: center;
+    gap: 9px;
+    min-height: 45px;
+    padding: 6px 4px;
+    border-bottom: 1px solid #e5eaed;
+}
+
+.map-layer-option input {
+    flex: 0 0 auto;
+    width: 19px;
+    height: 19px;
+}
+
+.map-layer-option span {
+    display: grid;
+    gap: 2px;
+}
+
+.map-layer-option small {
+    color: var(--muted);
+    font-size: 10px;
+    font-weight: 600;
+}
+
+.layer-panel-actions {
+    display: grid;
+    gap: 7px;
+    padding-top: 9px;
+}
+
 .gps-overlay {
     position: absolute;
     top: 72px;
@@ -384,6 +473,100 @@ label {
     pointer-events: none;
 }
 
+.wms-preview[hidden] {
+    display: none;
+}
+
+.wms-preview {
+    position: absolute;
+    inset: 0;
+    z-index: 1400;
+    display: grid;
+    place-items: center;
+    padding: 16px;
+    background: rgba(15, 22, 27, 0.72);
+}
+
+.wms-preview-dialog {
+    display: grid;
+    grid-template-rows: auto minmax(0, 1fr);
+    width: min(980px, 100%);
+    height: min(820px, 100%);
+    overflow: hidden;
+    border-radius: 8px;
+    background: #fff;
+    box-shadow: 0 10px 34px rgba(0, 0, 0, 0.34);
+}
+
+.wms-preview-dialog > header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+    padding: 11px 12px;
+    border-bottom: 1px solid var(--line);
+}
+
+.wms-preview-dialog > header div {
+    display: grid;
+    gap: 2px;
+}
+
+.wms-preview-dialog > header small {
+    color: var(--muted);
+    font-size: 10px;
+}
+
+.wms-preview-body {
+    display: grid;
+    min-height: 0;
+    place-items: center;
+    overflow: auto;
+    padding: 12px;
+    background: #eef2f3;
+    color: var(--muted);
+}
+
+.wms-preview-map {
+    position: relative;
+    flex: 0 0 auto;
+    overflow: hidden;
+    background: #fff;
+}
+
+.wms-preview-map[hidden] {
+    display: none;
+}
+
+.wms-preview-map img,
+.wms-preview-map svg {
+    display: block;
+    width: 100%;
+    height: 100%;
+}
+
+.wms-preview-map svg {
+    position: absolute;
+    inset: 0;
+    pointer-events: none;
+}
+
+.wms-preview-parcel {
+    fill: rgba(251, 191, 36, 0.28);
+    fill-rule: evenodd;
+    stroke: #ef4444;
+    stroke-width: 4px;
+    vector-effect: non-scaling-stroke;
+}
+
+.wms-preview-gps-parcel {
+    fill: rgba(56, 189, 248, 0.24);
+    fill-rule: evenodd;
+    stroke: #1d4ed8;
+    stroke-width: 4px;
+    vector-effect: non-scaling-stroke;
+}
+
 .bottom-tabs {
     position: absolute;
     right: 0;
@@ -462,6 +645,13 @@ footer {
         right: 8px;
     }
 
+    .map-layer-panel {
+        top: 68px;
+        right: 8px;
+        width: min(320px, calc(100% - 16px));
+        max-height: calc(100% - 144px);
+    }
+
     .tool-sheet {
         top: 10%;
         bottom: var(--nav-height);
@@ -504,6 +694,10 @@ footer {
     .bottom-tabs button {
         font-size: 11px;
     }
+
+    .wms-preview {
+        padding: 8px;
+    }
 }
 
 @media (max-width: 380px) {

wwwroot/js/lme-map.js

@@ -13,7 +13,8 @@ const lmeState = {
     gpsMarker: null,
     gpsAccuracy: null,
     gpsTrail: null,
-    currentParcelLayer: null,
+    selectedParcelsLayer: null,
+    gpsParcelLayer: null,
     gpsTrailEnabled: false,
     gpsTrailPoints: [],
     gpsWatchId: null,
@@ -30,6 +31,9 @@ window.lmeMap = {
     showSearchResult,
     displayOfficialParcel,
     exportCadastreView,
+    closeCadastrePreview,
+    clearSelectedParcels,
+    clearMapElements,
     fitImported,
     clearImported,
     addProjectMarker,
@@ -104,7 +108,8 @@ function init() {
     lmeState.currentBase = lmeState.baseLayers.satellite.addTo(lmeState.map);
     lmeState.imported = L.featureGroup().addTo(lmeState.map);
     lmeState.drawings = L.featureGroup().addTo(lmeState.map);
-    lmeState.currentParcelLayer = L.featureGroup().addTo(lmeState.map);
+    lmeState.selectedParcelsLayer = L.featureGroup().addTo(lmeState.map);
+    lmeState.gpsParcelLayer = L.featureGroup().addTo(lmeState.map);
     lmeState.gpsTrail = L.polyline([], { color: "#f97316", weight: 4, opacity: 0.85 }).addTo(lmeState.map);
 
     refreshCadastreLayer();
@@ -124,6 +129,18 @@ function init() {
     });
     lmeState.map.on("moveend", () => void updateAzureAttribution());
 
+    document.getElementById("closeWmsPreview")?.addEventListener("click", closeCadastrePreview);
+    document.getElementById("wmsPreview")?.addEventListener("click", event => {
+        if (event.target?.id === "wmsPreview") {
+            closeCadastrePreview();
+        }
+    });
+    document.addEventListener("keydown", event => {
+        if (event.key === "Escape") {
+            closeCadastrePreview();
+        }
+    });
+
     setInfo("Mappa pronta: satellite + catasto AdE");
 }
 
@@ -169,18 +186,39 @@ function displayOfficialParcel(xmlText, latitude, longitude, parcel, label, shou
             return;
         }
 
-        lmeState.currentParcelLayer.clearLayers();
+        const ref = feature.properties?.NATIONALCADASTRALREFERENCE || feature.properties?.INSPIREID_LOCALID || label;
+        const targetGroup = normalizedParcel ? lmeState.selectedParcelsLayer : lmeState.gpsParcelLayer;
+        if (!normalizedParcel) {
+            targetGroup.clearLayers();
+        }
+
+        const existingLayer = normalizedParcel
+            ? targetGroup.getLayers().find(item => item.lmeParcelReference === ref)
+            : null;
+        if (existingLayer) {
+            if (shouldFit) {
+                fitLayer(existingLayer);
+            }
+            setText("parcelState", `Particella selezionata: ${ref}`);
+            setInfo(`La particella ${ref} e' gia evidenziata sulla mappa.`);
+            return;
+        }
+
         const layer = L.geoJSON(feature, {
-            style: { color: "#ef4444", weight: 4, opacity: 1, fillColor: "#fbbf24", fillOpacity: 0.26 }
+            style: normalizedParcel
-        }).addTo(lmeState.currentParcelLayer);
+                ? { color: "#ef4444", weight: 4, opacity: 1, fillColor: "#fbbf24", fillOpacity: 0.26 }
+                : { color: "#1d4ed8", weight: 4, opacity: 1, fillColor: "#38bdf8", fillOpacity: 0.2 }
+        }).addTo(targetGroup);
+        layer.lmeParcelReference = ref;
+        layer.bindPopup(`<strong>${escapeHtml(ref)}</strong>`);
         if (shouldFit) {
             fitLayer(layer);
         }
 
-        const ref = feature.properties?.NATIONALCADASTRALREFERENCE || feature.properties?.INSPIREID_LOCALID || label;
         if (normalizedParcel) {
             setText("parcelState", `Particella selezionata: ${ref}`);
-            setInfo(`Trovata ${ref}. Ora puoi attivare il GPS e camminare dentro il confine evidenziato.`);
+            const count = lmeState.selectedParcelsLayer.getLayers().length;
+            setInfo(`Aggiunta ${ref}. Particelle evidenziate: ${count}.`);
         } else {
             setText("parcelState", `Dentro particella AdE: ${ref}`);
         }
@@ -201,12 +239,140 @@ function resize() {
 }
 
 function exportCadastreView() {
-    const center = lmeState.map.getCenter();
+    const layers = activeCadastreLayers();
-    const zoom = lmeState.map.getZoom();
+    if (!layers.length) {
-    const layers = lmeState.cadastreLayers.join(",");
+        setInfo("Attiva almeno un layer catastale prima di aprire la vista WMS.");
-    const url = `${cadastreUrl()}service=WMS&version=1.3.0&request=GetMap&layers=${encodeURIComponent(layers)}&styles=&format=image/png&transparent=true&width=1200&height=1200&crs=EPSG:4258&bbox=${center.lat - 0.01},${center.lng - 0.01},${center.lat + 0.01},${center.lng + 0.01}`;
+        return;
-    window.open(url, "_blank");
+    }
-    setInfo(`Vista catastale aperta per download. Zoom corrente: ${zoom}.`);
+
+    const bounds = lmeState.map.getBounds();
+    const size = lmeState.map.getSize();
+    const scale = Math.min(1, 1200 / size.x, 1200 / size.y);
+    const width = Math.max(256, Math.round(size.x * scale));
+    const height = Math.max(256, Math.round(size.y * scale));
+    const bbox = [bounds.getSouth(), bounds.getWest(), bounds.getNorth(), bounds.getEast()].join(",");
+    const params = new URLSearchParams({
+        service: "WMS",
+        version: "1.3.0",
+        request: "GetMap",
+        layers: layers.join(","),
+        styles: "",
+        format: "image/png",
+        transparent: "true",
+        width: String(width),
+        height: String(height),
+        crs: "EPSG:4258",
+        bbox
+    });
+    const preview = document.getElementById("wmsPreview");
+    const previewBody = preview?.querySelector(".wms-preview-body");
+    const previewMap = document.getElementById("wmsPreviewMap");
+    const image = document.getElementById("wmsPreviewImage");
+    const overlay = document.getElementById("wmsPreviewOverlay");
+    const loading = document.getElementById("wmsPreviewLoading");
+    if (!preview || !previewBody || !previewMap || !image || !overlay || !loading) {
+        setInfo("Vista WMS interna non disponibile.");
+        return;
+    }
+
+    preview.hidden = false;
+    const availableWidth = Math.max(1, previewBody.clientWidth - 24);
+    const availableHeight = Math.max(1, previewBody.clientHeight - 24);
+    const displayScale = Math.min(1, availableWidth / width, availableHeight / height);
+    previewMap.style.width = `${Math.max(1, Math.round(width * displayScale))}px`;
+    previewMap.style.height = `${Math.max(1, Math.round(height * displayScale))}px`;
+    previewMap.hidden = true;
+    renderPreviewParcelOverlay(overlay, bounds, width, height);
+
+    loading.textContent = "Caricamento...";
+    loading.hidden = false;
+    image.onload = () => {
+        loading.hidden = true;
+        previewMap.hidden = false;
+        const highlightedCount = lmeState.selectedParcelsLayer.getLayers().length
+            + lmeState.gpsParcelLayer.getLayers().length;
+        setInfo(`Vista WMS caricata con ${layers.length} layer e ${highlightedCount} particelle evidenziate.`);
+    };
+    image.onerror = () => {
+        previewMap.hidden = true;
+        loading.textContent = "Il servizio WMS non ha restituito l'immagine. Riprova tra poco.";
+        setInfo("Vista WMS non disponibile.");
+    };
+    image.src = `${cadastreUrl()}${params}`;
+}
+
+function closeCadastrePreview() {
+    const preview = document.getElementById("wmsPreview");
+    const previewMap = document.getElementById("wmsPreviewMap");
+    const image = document.getElementById("wmsPreviewImage");
+    const overlay = document.getElementById("wmsPreviewOverlay");
+    if (preview) {
+        preview.hidden = true;
+    }
+    if (previewMap) {
+        previewMap.hidden = true;
+    }
+    if (image) {
+        image.onload = null;
+        image.onerror = null;
+        image.removeAttribute("src");
+    }
+    overlay?.replaceChildren();
+}
+
+function renderPreviewParcelOverlay(svg, bounds, width, height) {
+    svg.replaceChildren();
+    svg.setAttribute("viewBox", `0 0 ${width} ${height}`);
+    appendPreviewGeometry(svg, lmeState.selectedParcelsLayer.toGeoJSON(), "wms-preview-parcel", bounds, width, height);
+    appendPreviewGeometry(svg, lmeState.gpsParcelLayer.toGeoJSON(), "wms-preview-gps-parcel", bounds, width, height);
+}
+
+function appendPreviewGeometry(svg, featureCollection, className, bounds, width, height) {
+    const namespace = "http://www.w3.org/2000/svg";
+    for (const feature of featureCollection?.features || []) {
+        for (const polygon of geometryPolygons(feature.geometry)) {
+            const pathData = polygon
+                .map(ring => ring
+                    .map((coordinate, index) => {
+                        const point = previewPixel(coordinate, bounds, width, height);
+                        return `${index ? "L" : "M"}${point.x.toFixed(2)} ${point.y.toFixed(2)}`;
+                    })
+                    .join(" ") + " Z")
+                .join(" ");
+            if (!pathData.trim()) {
+                continue;
+            }
+            const path = document.createElementNS(namespace, "path");
+            path.setAttribute("d", pathData);
+            path.setAttribute("class", className);
+            svg.appendChild(path);
+        }
+    }
+}
+
+function geometryPolygons(geometry) {
+    if (!geometry) {
+        return [];
+    }
+    if (geometry.type === "Polygon") {
+        return [geometry.coordinates || []];
+    }
+    if (geometry.type === "MultiPolygon") {
+        return geometry.coordinates || [];
+    }
+    if (geometry.type === "GeometryCollection") {
+        return (geometry.geometries || []).flatMap(geometryPolygons);
+    }
+    return [];
+}
+
+function previewPixel(coordinate, bounds, width, height) {
+    const longitude = Number(coordinate?.[0]);
+    const latitude = Number(coordinate?.[1]);
+    return {
+        x: ((longitude - bounds.getWest()) / (bounds.getEast() - bounds.getWest())) * width,
+        y: ((bounds.getNorth() - latitude) / (bounds.getNorth() - bounds.getSouth())) * height
+    };
 }
 
 function bindFileImport() {
@@ -590,6 +756,19 @@ function toggleCadastreLayer(layer, enabled) {
         lmeState.cadastreLayers = lmeState.cadastreLayers.filter(item => item !== layer);
     }
     refreshCadastreLayer();
+    const layerNames = {
+        "CP.CadastralParcel": "Confini particelle",
+        codice_plla: "Numeri particelle",
+        "CP.CadastralZoning": "Fogli catastali",
+        fabbricati: "Fabbricati",
+        strade: "Strade catastali",
+        acque: "Acque"
+    };
+    if (enabled && layer === "codice_plla" && lmeState.map.getZoom() < 17) {
+        setInfo("Numeri particelle attivati. Ingrandisci la mappa almeno fino a zoom 17 per renderli visibili.");
+        return;
+    }
+    setInfo(`${layerNames[layer] || layer}: ${enabled ? "attivo" : "nascosto"}.`);
 }
 
 function refreshCadastreLayer() {
@@ -597,12 +776,14 @@ function refreshCadastreLayer() {
         lmeState.map.removeLayer(lmeState.cadastre);
     }
 
-    if (!lmeState.cadastreLayers.length) {
+    const layers = activeCadastreLayers();
+    lmeState.cadastre = null;
+    if (!layers.length) {
         return;
     }
 
     lmeState.cadastre = L.tileLayer.wms(cadastreUrl(), {
-        layers: lmeState.cadastreLayers.join(","),
+        layers: layers.join(","),
         format: "image/png",
         transparent: true,
         version: "1.3.0",
@@ -613,6 +794,49 @@ function refreshCadastreLayer() {
     }).addTo(lmeState.map);
 }
 
+function activeCadastreLayers() {
+    const drawOrder = [
+        "CP.CadastralZoning",
+        "strade",
+        "acque",
+        "fabbricati",
+        "CP.CadastralParcel",
+        "codice_plla"
+    ];
+    return drawOrder.filter(layer => lmeState.cadastreLayers.includes(layer));
+}
+
+function clearSelectedParcels() {
+    const count = lmeState.selectedParcelsLayer.getLayers().length;
+    lmeState.selectedParcelsLayer.clearLayers();
+    updateGpsInsideState();
+    setInfo(count ? `${count} particelle selezionate rimosse.` : "Non ci sono particelle selezionate da rimuovere.");
+}
+
+function clearMapElements() {
+    const count = lmeState.selectedParcelsLayer.getLayers().length
+        + lmeState.gpsParcelLayer.getLayers().length
+        + lmeState.imported.getLayers().length
+        + lmeState.drawings.getLayers().length
+        + lmeState.gpsTrailPoints.length;
+    if (!count) {
+        setInfo("La mappa non contiene elementi da pulire.");
+        return;
+    }
+    if (!window.confirm("Rimuovere particelle evidenziate, file importati, disegni, POI e traccia GPS dalla mappa?")) {
+        return;
+    }
+
+    lmeState.selectedParcelsLayer.clearLayers();
+    lmeState.gpsParcelLayer.clearLayers();
+    lmeState.imported.clearLayers();
+    lmeState.drawings.clearLayers();
+    lmeState.gpsTrailPoints = [];
+    lmeState.gpsTrail.setLatLngs([]);
+    updateGpsInsideState();
+    setInfo("Elementi della mappa rimossi. Sfondo e layer catastali restano attivi.");
+}
+
 function startGps() {
     if (!navigator.geolocation) {
         setInfo("Geolocalizzazione non disponibile sul dispositivo.");
@@ -711,7 +935,8 @@ function updateGpsInsideState() {
     }
 
     const point = [lmeState.lastPosition[1], lmeState.lastPosition[0]];
-    const officialMatch = findContainingPolygon(point, lmeState.currentParcelLayer.toGeoJSON());
+    const officialMatch = findContainingPolygon(point, lmeState.selectedParcelsLayer.toGeoJSON())
+        || findContainingPolygon(point, lmeState.gpsParcelLayer.toGeoJSON());
     if (officialMatch) {
         const reference = officialMatch.properties?.NATIONALCADASTRALREFERENCE
             || officialMatch.properties?.INSPIREID_LOCALID
@@ -731,7 +956,7 @@ function updateGpsInsideState() {
 
     setText(
         "parcelState",
-        lmeState.currentParcelLayer.getLayers().length
+        lmeState.selectedParcelsLayer.getLayers().length || lmeState.gpsParcelLayer.getLayers().length
             ? "Fuori dalla particella catastale evidenziata"
             : "Fuori dai poligoni caricati");
 }