Field Definitions are Available Here
Collection
varstring(80)
Mandatory if applicable
The identification given to surface of reference from which depths are measured.
Local Surface
DepthDistanceUnits, DepthEncodingMethod, DepthResolution
Local Surface
Must be used with DepthDistanceUnits, DepthEncodingMethod, DepthResolution.
METADATA > COLLECTIONMETADATA > Spatial > CoordinateSystemContainer > VerticalCoordinateSystemContainer > DepthSystemDefinition.DepthDatumName
/gmi:MI_Metadata/gmd:referenceSystemInfo/gmd:MD_ReferenceSystem/gmd:referenceSystemIdentifier/gmd:RS_Identifier/gmd:authority/gmd:CI_Citation/gmd:title/gco:CharacterString or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:verticalCRS/gco:CharacterString
See also CD_VerticalDatum and CD_VerticalDatumType in 19111 /gmi:MI_Metadata/gmd:referenceSystemInfo/gmd:MD_ReferenceSystem/gmd:referenceSystemIdentifier/gmd:RS_Identifier/gmd:authority/gmd:CI_Citation/gmd:title/gco:CharacterString
Spatial Information