+ attribution: '© <a href="http://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a> contributors. ' + document.location.protocol === 'https:' ?
+ 'Tiles courtesy of <a href="http://www.mapquest.com/" target="_blank">MapQuest</a> <img src="https://developer.mapquest.com/content/osm/mq_logo.png">' :
+ 'Tiles courtesy of <a href="http://www.mapquest.com/" target="_blank">MapQuest</a> <img src="http://developer.mapquest.com/content/osm/mq_logo.png">'
+ }
+});
+
+L.OSM.HOT = L.OSM.TileLayer.extend({
+ options: {
+ url: document.location.protocol === 'https:' ?
+ 'https://tile-{s}.openstreetmap.fr/hot/{z}/{x}/{y}.png' :
+ 'http://tile-{s}.openstreetmap.fr/hot/{z}/{x}/{y}.png',
+ maxZoom: 20,
+ subdomains: 'abc',
+ attribution: '© <a href="http://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a> contributors. Tiles courtesy of <a href="http://hot.openstreetmap.org/" target="_blank">Humanitarian OpenStreetMap Team</a>'
+ }
+});
+
+L.OSM.GPS = L.OSM.TileLayer.extend({
+ options: {
+ url: document.location.protocol === 'https:' ?
+ 'https://gps-{s}.tile.openstreetmap.org/lines/{z}/{x}/{y}.png' :
+ 'http://gps-{s}.tile.openstreetmap.org/lines/{z}/{x}/{y}.png',
+ maxZoom: 20,
+ subdomains: 'abc'