Prevent unnecessary tile loading for default base layer

by only setting it if no layer activated by hash URL

js/control/Control.Layers.js

@@ -17,6 +17,18 @@ BR.ControlLayers = L.Control.Layers.extend({
         return result;
     },
 
+    getActiveBaseLayer: function () {
+        var activeLayers = this.getActiveLayers();
+        for (var i = 0; i < activeLayers.length; i++) {
+            var obj = activeLayers[i];
+            if (!obj.overlay) {
+                return obj;
+            }
+        }
+
+        return null;
+    },
+
     removeActiveLayers: function () {
         var removed = [];
 
@@ -42,6 +54,12 @@ BR.ControlLayers = L.Control.Layers.extend({
         return null;
     },
 
+    getBaseLayers: function () {
+        return this._layers.filter(function (obj) {
+            return !obj.overlay;
+        });
+    },
+
     activateLayer: function (layer) {
         this._map.addLayer(layer);
     },
@@ -54,6 +72,13 @@ BR.ControlLayers = L.Control.Layers.extend({
                 break;
             }
         }
+    },
+
+    activateBaseLayerIndex: function (index) {
+        var baseLayers = this.getBaseLayers();
+        var obj = baseLayers[index];
+
+        this.activateLayer(obj.layer);
     }
 
 });

js/control/LayersTab.js

@@ -315,6 +315,14 @@ BR.LayersTab = BR.ControlLayers.extend({
         return obj;
     },
 
+    activateDefaultBaseLayer: function () {
+        var index = BR.conf.defaultBaseLayerIndex || 0;
+        var activeBaseLayer = this.getActiveBaseLayer();
+        if (!activeBaseLayer) {
+            this.activateBaseLayerIndex(index);
+        }
+    },
+
     saveRemoveActiveLayers: function () {
 		this.saveLayers = this.removeActiveLayers();
     },