diff --git a/webgis/js/gis.js b/webgis/js/gis.js
index f599d24..ad6e034 100644
--- a/webgis/js/gis.js
+++ b/webgis/js/gis.js
@@ -25,6 +25,9 @@ const GIS = {};
 
 GIS.CENTER_COORDS = [40.5492, 14.2317];
 GIS.INIT_ZOOM = 14;
+GIS.MIN_ZOOM = 11;
+GIS.MAX_ZOOM = 24;
+
 const optionsVincoli = {
     color: '#222',
     opacity: 0.8,
@@ -119,7 +122,7 @@ GIS.initMap = async function (mapId, zoomLevel = this.INIT_ZOOM) {
     
     let map = L.map(mapId, {
         //attributionControl: false,
-        minZoom: 11,
+        minZoom: GIS.MIN_ZOOM,
     }).setView(this.CENTER_COORDS, zoomLevel);
 
     map.crs = L.CRS.EPSG4326;
@@ -368,16 +371,16 @@ GIS.initLayers = async function(map) {
     layerLopozzo.id = 'lopozzo';
 
     let osmap = new L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
-        maxNativeZoom : 22,
-        maxZoom: 22,
+        maxNativeZoom : GIS.MAX_ZOOM,
+        maxZoom: GIS.MAX_ZOOM,
         attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
     });
     let mapbox = new L.tileLayer(`https://api.mapbox.com/v4/{id}/{z}/{x}/{y}@2x.jpg90?access_token=${MAPBOX_TOKEN}`, {
         id : 'mapbox.satellite',
         tileSize : 512,
         zoomOffset : -1,
-        maxNativeZoom : 22,
-        maxZoom: 22,
+        maxNativeZoom : GIS.MAX_ZOOM,
+        maxZoom: GIS.MAX_ZOOM,
         attribution: '&copy; Mapbox'
     });
     let boundaries = await this.loadLayer('confini.geojson', {}, false);