javascript - 如何根据与给定点的距离获取边界框？

Question

我需要将地图区域限制在给定点周围 5 公里半径范围内。如何使用 mapbox-gl-js 或 turf 获得适当的边界框？

Answer 1

您可以使用http://turfjs.org/docs/#buffer获取所需半径大小的特征，然后使用http://turfjs.org/docs/#bbox获取 bbox。

var point = turf.point([-90.548630, 14.616599]);
var buffered = turf.buffer(point, 5, {units:'kilometers'});
var bbox = turf.bbox(buffered);
console.log(turf.bboxPolygon(bbox));

<script src="https://npmcdn.com/@turf/turf/turf.min.js"></script>

Answer 2

Buffer API has changed. Buffer's optional argument needs to be an object like so:

var point = turf.point([-90.548630, 14.616599]);
var buffered = turf.buffer(point, 5, {units:'kilometers'}); /// notice 'units'
var bbox = turf.bbox(buffered);
console.log(turf.bboxPolygon(bbox));