cdm/src/main/java/ucar/atd/dorade/DoradeSWIB.java
public float[] getAltitudes() {
    if (myASIBs == null)
      return null;
    float[] alts = new float[nRays];
    for (int i = 0; i < nRays; i++)
      alts[i] = myASIBs[i].getAltitude();
    return alts;
  }
public float[] getAltitudes() {
    if (myASIBs == null)
      return null;
    float[] alts = new float[nRays];
    for (int i = 0; i < nRays; i++)
      alts[i] = myASIBs[i].getAltitude();
    return alts;
  }
Get the array of per-ray altitudes.  If we do not have per-ray position
information, null is returned.

@return an array of per-ray altitudes in km MSL, or null if no per-ray
position information is available.