Update base map

Author: Nabeel Shahzad

lib/js/base_map.js

@@ -15,11 +15,10 @@ const createMap = (opts) => {
 
     let feature_groups = [];
     const opencyclemap_phys_osm = new L.TileLayer(
-        'http://{s}.tile.thunderforest.com/landscape/{z}/{x}/{y}.png?apikey=f09a38fa87514de4890fc96e7fe8ecb1', {
-            maxZoom: 14,
-            minZoom: 4,
-            format: 'image/png',
-            transparent: true
+        'https://a.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
+            maxZoom: 15,
+            noWrap: true,
+            attribution: 'Map tiles by Carto, under CC BY 3.0. Data by OpenStreetMap, under ODbL.'
         });
 
     feature_groups.push(opencyclemap_phys_osm);
@@ -32,13 +31,5 @@ const createMap = (opts) => {
         scrollWheelZoom: false,
     });
 
-    const attrib = L.control.attribution({ position: 'bottomleft' });
-    attrib.addAttribution('<a href="https://www.thunderforest.com" target="_blank" style="">Thunderforest</a>');
-    attrib.addAttribution('<a href="https://www.openaip.net" target="_blank" style="">openAIP</a>');
-    attrib.addAttribution('<a href="https://www.openstreetmap.org/copyright" target="_blank" style="">OpenStreetMap</a> contributors');
-    attrib.addAttribution('<a href="https://www.openweathermap.org" target="_blank" style="">OpenWeatherMap</a>');
-
-    attrib.addTo(map);
-
     return map
 };