ncfile.addVariable(null, elevVar);
elevVar.addAttribute( new Attribute("units", "degrees"));
elevVar.addAttribute( new Attribute("long_name", "elevation angle in degres: 0 = parallel to pedestal base, 90 = perpendicular"));
elevVar.addAttribute( new Attribute("missing_value", firstRay.getMissingData()));
elevVar.addAttribute( new Attribute(_Coordinate.AxisType, AxisType.RadialElevation.toString()));
// add azimuth coordinate variable
String aziCoordName = "azimuth"+abbrev;
Variable aziVar = new Variable(ncfile, null, null, aziCoordName);
aziVar.setDataType(DataType.FLOAT);