function *mapCorner(dtrsco){
let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
var maxView = L.latLngBounds(
L.latLng(48.5, -82),
L.latLng(41, -97.5)
);
let map = L.map(container,{
minZoom: 7,
maxZoom: 18,
maxBounds: maxView
}).setView([44.85,-89.8], 7);
let osmLayer = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}@2x.png', {
attribution: '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
}