Attributes {
    ISTA {
        Int32 gridtype 2;
        String units "ids";
    }
    NGVD {
        String units "m";
        Float32 missing_value -99.0;
        String long_name "National Geodetic Vertical Datun of 1929";
    }
NC_GLOBAL {
    String Conventions "IRIDL";
}
}