cdm/src/main/java/ucar/nc2/dt/grid/GridCoordSys.java
@Override
  public boolean isGlobalLon() {
    if (!isLatLon) return false;
    if (!(horizXaxis instanceof CoordinateAxis1D)) return false;
    CoordinateAxis1D lon = (CoordinateAxis1D) horizXaxis;
    double first = lon.getCoordEdge(0);
    double last = lon.getCoordEdge((int) lon.getSize());
    double min = Math.min(first, last);
    double max =  Math.max(first, last);
    return (max - min) >= 360;
  }
@Override
  public boolean isGlobalLon() {
    if (!isLatLon) return false;
    if (!(horizXaxis instanceof CoordinateAxis1D)) return false;
    CoordinateAxis1D lon = (CoordinateAxis1D) horizXaxis;
    double first = lon.getCoordEdge(0);
    double last = lon.getCoordEdge((int) lon.getSize());
    double min = Math.min(first, last);
    double max =  Math.max(first, last);
    return (max - min) >= 360;
  }
Is this a global coverage over longitude ?
@return true if isLatLon and longitude wraps