如何根据距给定点的距离得到边界框？

Question

我需要限制地图区域到给定点周围5公里半径。如何使用mapbox-gl-js或turf获得合适的边界框？

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

缓冲区API已更改。 Buffer的可选参数必须是这样的对象：

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));