VRDAT_UID      VRDAT_NAME      VRDAT_DESC                                    
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1              NGVD29          National Geodetic Vertical Datum of 1929      
2              NAVD88          North American Vertical Datum of 1988         
3              LTD             Local Tidal Datum                             
4              SEALV           Elevation From Mean Sea-Level                 
5              OTHER           Other                                         
6              UNKWN           Unknown