Mapbox:如何从Mapbox获取缩放级别的比例？

mapboxgl.accessToken = 'YOUR_ACCESS_TOKEN';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v11',
    center: [-74.5, 40],
    zoom: 9
});

// 获取当前缩放级别
var zoom = map.getZoom();

// 根据缩放级别获取比例尺
var scale = getScaleFromZoom(zoom);

console.log("当前缩放级别:", zoom);
console.log("比例尺:", scale);

// 根据缩放级别计算比例尺
function getScaleFromZoom(zoom) {
    var metersPerPixel = 156543.03392 * Math.cos(map.getCenter().lat * Math.PI / 180) / Math.pow(2, zoom);
    var scale = metersPerPixel * 39.37 * 12;
    return scale.toFixed(2) + " inches to 1 mile";
}