generate accuracy

self.doit = function ( pos, acc ) {

	var points = {
		"type": "FeatureCollection",
		"features": [ {
			"type": "Feature",
			"properties": {},
			"geometry": {
				"type": "Point",
				"coordinates": [ -71.16437494754791,
					42.35219326967517
				]
			}
		}, {
			"type": "Feature",
			"properties": {},
			"geometry": {
				"type": "Point",
				"coordinates": [ -71.16197168827057,
					42.352538171523115
				]
			}
		} ]
	}

	var polys = []
	var feats = points.features
	var i, len = feats.length
	for ( i = 0; i < len; i++ ) {

		var polypoints = []
		var ii, len = 10
		for ( ii = 0; ii < len; ii++ ) {
			var bearing = 360 * ( Number( '0.' + ii.toString() ) )
			var dest = turf.destination( feats[ i ], acc / 1000, bearing, 'kilometers' ).geometry.coordinates
			console.log( 'dest >', dest )
			polypoints.push( dest )
		}
		polypoints[ polypoints.length ] = polypoints[ 0 ]

		polys[ i ] = turf.polygon( [ polypoints ] )
	}


	var polyfeats = turf.featurecollection( polys )
	var source = new mapboxgl.GeoJSONSource( {
		data: polyfeats
	} )

	_$map.map.addSource( "polys", source )

	_$map.map.addLayer( {
		'id': 'polys',
		'type': 'fill',
		'source': 'polys',
		'paint': {
			'fill-color': '#000',
			'fill-opacity': 0.8
		}
	} )
}