metre
EPSG
NSGI: Netherlands Partnership of Kadaster, Rijkswaterstaat and Hydrographic Servicehttp://www.nsgi.nl/.
2020-08-31
Geodesy, engineering survey.
Use has been extended from Netherlands onshore to Netherlands onshore and offshore from 2018.
Definition: OGC Well Known Text 2 (2019)
VERTCRS["NAP height", VDATUM["Normaal Amsterdams Peil"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Geodesy, engineering survey."], AREA["Netherlands - onshore and offshore."], BBOX[50.75,2.53,55.77,7.22]], ID["EPSG",5709]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "NAP height", "datum": { "type": "VerticalReferenceFrame", "name": "Normaal Amsterdams Peil" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "scope": "Geodesy, engineering survey.", "area": "Netherlands - onshore and offshore.", "bbox": { "south_latitude": 50.75, "west_longitude": 2.53, "north_latitude": 55.77, "east_longitude": 7.22 }, "id": { "authority": "EPSG", "code": 5709 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+vunits=m +no_defs +type=crs"> <Layer srs="+vunits=m +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 5709, 'EPSG', 5709, '+vunits=m +no_defs +type=crs', 'VERT_CS["NAP height",VERT_DATUM["Normaal Amsterdams Peil",2005,AUTHORITY["EPSG","5109"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5709"]]');