internal MultiPolyLine ToLngLat(MultiPolyLine prjMulline)
 {
     if (_ProjectedSystem == ProjectedSystem.WebMercator)
     {
         return(WebMercator2lonLat(prjMulline));
     }
     else
     {
         return(prjMulline.Clone());
     }
 }
 internal MultiPolyLine ToProjCo(MultiPolyLine geoMulline)
 {
     if (_ProjectedSystem == ProjectedSystem.WebMercator)
     {
         return(lonLat2WebMercator(geoMulline));
     }
     else
     {
         return(geoMulline.Clone());
     }
 }