cdm/src/main/java/ucar/nc2/ft/point/standard/plug/CFpointObs.java
protected boolean identifyEncodingStation(NetcdfDataset ds, EncodingInfo info, CF.FeatureType ftype, Formatter errlog) {
    // find the obs dimension
    Dimension obsDim = null;
    if (info.time.getRank() > 0)
      obsDim = info.time.getDimension(info.time.getRank() - 1); // may be time(time) or time(stn, obs)
    else if (info.time.getParentStructure() != null) {
      Structure parent = info.time.getParentStructure(); // if time axis is a structure member, try pulling dimension out of parent structure
      obsDim = parent.getDimension(parent.getRank() - 1);
    }
    if (obsDim == null) {
      errlog.format("CFpointObs: must have a non-scalar Time coordinate%n");
      return false;
    }

    // find the station dimension
    if (info.lat.getRank() == 0) {// scalar means single
      info.set(Encoding.single, null, obsDim);
      return true;
    }

    Dimension stnDim = info.lat.getDimension(0);
    if (obsDim == stnDim) {
      info.set(Encoding.flat, null, obsDim); // not used ?
      return true;
    }

    // the raggeds
    if (identifyRaggeds(ds, info, stnDim, obsDim, errlog))
      return true;

    // heres whats left
    if (info.lat.getRank() == 1) {
      //Encoding e = (info.time.getParentStructure() != null) ? Encoding.multiStructure : Encoding.multidim;
      info.set(Encoding.multidim, stnDim, obsDim);
      return true;
    }

    errlog.format("CFpointObs: %s Must have Lat/Lon coordinates of rank 0 or 1%n", ftype);
    return false;
  }
protected boolean identifyEncodingStation(NetcdfDataset ds, EncodingInfo info, CF.FeatureType ftype, Formatter errlog) {
    // find the obs dimension
    Dimension obsDim = null;
    if (info.time.getRank() > 0)
      obsDim = info.time.getDimension(info.time.getRank() - 1); // may be time(time) or time(stn, obs)
    else if (info.time.getParentStructure() != null) {
      Structure parent = info.time.getParentStructure(); // if time axis is a structure member, try pulling dimension out of parent structure
      obsDim = parent.getDimension(parent.getRank() - 1);
    }
    if (obsDim == null) {
      errlog.format("CFpointObs: must have a non-scalar Time coordinate%n");
      return false;
    }

    // find the station dimension
    if (info.lat.getRank() == 0) {// scalar means single
      info.set(Encoding.single, null, obsDim);
      return true;
    }

    Dimension stnDim = info.lat.getDimension(0);
    if (obsDim == stnDim) {
      info.set(Encoding.flat, null, obsDim); // not used ?
      return true;
    }

    // the raggeds
    if (identifyRaggeds(ds, info, stnDim, obsDim, errlog))
      return true;

    // heres whats left
    if (info.lat.getRank() == 1) {
      //Encoding e = (info.time.getParentStructure() != null) ? Encoding.multiStructure : Encoding.multidim;
      info.set(Encoding.multidim, stnDim, obsDim);
      return true;
    }

    errlog.format("CFpointObs: %s Must have Lat/Lon coordinates of rank 0 or 1%n", ftype);
    return false;
  }
for stations, figure out the encoding