Might not be 100% exactly what you need, but this should get you started in
the right direction.
//Check if within range
var R = 6371; // km
var dLat = (curLat-paramLat).toRad();
var dLon = (curLng-paramLong).toRad();
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(paramLat.toRad()) * Math.cos(paramLong.toRad()) *
Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
if(d <= (paramRadius/1000)){
coordList.push({
lat: curLat,
lng: curLng,
alt: parseFloat(coords[2])
});
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