code: func (b *Bound) GeoPad(meters float64) *Bound {
  	dy := meters / 111131.75
  	dx := dy / math.Cos(deg2rad(b.ne.Lat()))
  	dx = math.Max(dx, dy/math.Cos(deg2rad(b.sw.Lat())))
  
  	b.sw.SetLng(b.sw.Lng() - dx)
  	b.sw.SetLat(b.sw.Lat() - dy)
  
  	b.ne.SetLng(b.ne.Lng() + dx)
  	b.ne.SetLat(b.ne.Lat() + dy)
  
  	return b
  }
docs: // GeoPad expands the bound in all directions by the given amount of meters.
  // Only applies if the data is Lng/Lat degrees.