EPSG:9287 — LAT-NLD depth

VERTCRS[
    "LAT-NLD depth",
    VDATUM["Lowest Astronomical Tide Netherlands",ID["EPSG",1290]],
    CS[vertical,1,ID["EPSG",6498]],
    AXIS["Depth (D)",down],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    GEOIDMODEL["ETRS89-NLD [AGRS2010] to LAT-NLD depth (1)",ID["EPSG",10350]],
    ID["EPSG",9287]
]

+vunits=m +no_defs +type=crs

proj4.defs("EPSG:9287", "+vunits=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 9287,
  "name": "LAT-NLD depth",
  "kind": "vertical",
  "area": "Netherlands - offshore and nearshore ",
  "unit": "metre",
  "bbox": [
    51.32,
    2.53,
    55.77,
    7.21
  ],
  "proj4": "+vunits=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (9287, 'EPSG', 9287, '+vunits=m +no_defs +type=crs', 'VERT_CS["LAT NL depth",VERT_DATUM["Lowest Astronomical Tide Netherlands",2005,AUTHORITY["EPSG","1290"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Depth",DOWN],AUTHORITY["EPSG","9287"]]');

PROJECTION
  "+vunits=m"
  "+no_defs"
  "+type=crs"
END

9287=VERT_CS["LAT NL depth",VERT_DATUM["Lowest Astronomical Tide Netherlands",2005,AUTHORITY["EPSG","1290"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Depth",DOWN],AUTHORITY["EPSG","9287"]]