show poi on less zoom

server/static/js/overlays/AbstractIconOverlay.js

@@ -47,10 +47,14 @@ var AbstractIconOverlay = L.LayerGroup.extend({
     return this.icon;
   },
 
+  getMaxDisplayedZoom: function(){
+    return 10;
+  },
+
   reDraw: function(full){
     var self = this;
 
-    if (this.map.getZoom() < 10) {
+    if (this.map.getZoom() < this.getMaxDisplayedZoom()) {
       this.clearLayers();
       this.currentObjects = {};
       return;

server/static/js/overlays/PoiOverlay.js

@@ -16,6 +16,10 @@ var PoiOverlay = AbstractIconOverlay.extend({
     AbstractIconOverlay.prototype.initialize.call(this, wsChannel, layerMgr, "poi", PoiIcon);
   },
 
+  getMaxDisplayedZoom: function(){
+    return 5;
+  },
+
   createPopup: function(poi){
     return "<h4>" + poi.attributes.name + "</h4><hr>" +
       "<b>Owner: </b> " + poi.attributes.owner + "<br>";