如何根据距给定点的距离得到边界框？

Question

I need restrict map area to 5km radius around given point. How can I get appropriate bounding box using mapbox-gl-js or turf?

Answer 1

You can use http://turfjs.org/docs/#buffer to get a feature in size of the radius that you want and then use http://turfjs.org/docs/#bbox to get the 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));