public OMRangeRings(LatLonPoint center,double radius,Length units,int nverts){
  super(center,radius,units,nverts);
  centerPoint=createCenterPoint();
  form.setMaximumFractionDigits(2);
}

public OMRangeRings ( LatLonPoint center , double radius , Length units , int nverts ) { super ( center , radius , units , nverts ) ; centerPoint = createCenterPoint ( ) ; form . setMaximumFractionDigits ( 2 ) ; }
create an omrangerings with a lat / lon center and a physical distance radius . rendertype is rendertype_latlon .
