opendap/src/main/java/ucar/nc2/dods/DODSNetcdfFile.java
static public boolean isUnsigned(opendap.dap.BaseType dtype)
  {
    return (dtype instanceof DByte) ||
            (dtype instanceof DUInt16) ||
            (dtype instanceof DUInt32);
  }
static public boolean isUnsigned(opendap.dap.BaseType dtype)
  {
    return (dtype instanceof DByte) ||
            (dtype instanceof DUInt16) ||
            (dtype instanceof DUInt32);
  }
Get whether this is an unsigned type.

@param dtype DODS BaseType.
@return true if unsigned