EPSG:8904 — TWVD 2001 height

Vertical · Taiwan - onshore - mainland

Export Formats

OGC WKT

VERT_CS[
    "TWVD 2001 height",
    VERT_DATUM["Taiwan Vertical Datum 2001",2005,AUTHORITY["EPSG","1224"]],
    UNIT["metre",1,AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["EPSG","8904"]
]

WKT2

VERTCRS[
    "TWVD 2001 height",
    VDATUM["Taiwan Vertical Datum 2001",ID["EPSG",1224]],
    CS[vertical,1,ID["EPSG",6499]],
    AXIS["Gravity-related height (H)",up],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",8904]
]

PROJ.4

+vunits=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:8904", "+vunits=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 8904,
  "name": "TWVD 2001 height",
  "kind": "vertical",
  "area": "Taiwan - onshore - mainland",
  "unit": "metre",
  "bbox": [
    21.87,
    119.99,
    25.34,
    122.06
  ],
  "proj4": "+vunits=m +no_defs +type=crs"
}

PostGIS

How to add a projection to PostGIS? →

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (8904, 'EPSG', 8904, '+vunits=m +no_defs +type=crs', 'VERT_CS["TWVD 2001 height",VERT_DATUM["Taiwan Vertical Datum 2001",2005,AUTHORITY["EPSG","1224"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","8904"]]');

MapServer

How to add a projection to MapServer? →

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

GeoServer

How to add a projection to GeoServer? →

8904=VERT_CS["TWVD 2001 height",VERT_DATUM["Taiwan Vertical Datum 2001",2005,AUTHORITY["EPSG","1224"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","8904"]]

Frequently Asked Questions

How do I add EPSG:8904 to GeoServer?

Add the following definition to your GeoServer configuration:

8904=VERT_CS["TWVD 2001 height",VERT_DATUM["Taiwan Vertical Datum 2001",2005,AUTHORITY["EPSG","1224"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","8904"]]

Read the full GeoServer guide →

How do I add EPSG:8904 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (8904, 'EPSG', 8904, '+vunits=m +no_defs +type=crs', 'VERT_CS["TWVD 2001 height",VERT_DATUM["Taiwan Vertical Datum 2001",2005,AUTHORITY["EPSG","1224"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","8904"]]');

Read the full PostGIS guide →

How do I add EPSG:8904 to MapServer?

Add the following definition to your MapServer configuration:

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

Read the full MapServer guide →

How do I use EPSG:8904 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:8904", "+vunits=m +no_defs +type=crs");

Read the full Proj4js guide →