public DepthIndex(int value)
 {
     Uom   = DepthUnit.Meter;
     Value = value;
 }
 public DepthIndex(double value, string uom)
 {
     Uom   = DepthUnit.FromString(uom);
     Value = value;
 }
 public DepthIndex(double value)
 {
     Uom   = DepthUnit.Meter;
     Value = value;
 }
 public DepthIndex(double value, DepthUnit uom)
 {
     Uom   = uom;
     Value = value;
 }