arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}').addTo(map);

    b = L.nonTiledLayer.wms('http://mapious.ceoas.oregonstate.edu/geoserver/baldricg_PNW_ATLAS/wms?', {
//        maxZoom: 19,
//        minZoom: 0,
        layers: 'pnw_snowfall',
        format: 'image/png',
        transparent: 'true',
        opacity: 0.8
    }).addTo(map);

    map.on('moveend',updateMapFilter);
    map.on('zoomend',updateMapFilter);

    function updateMapFilter() {

        url= b._ctx.canva