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Geodetic CRS: NGVD29 height (ftUS)
Datum: National Geodetic Vertical Datum 1929
Data source: EPSG
Information source: IOGP
Revision date: 2021-04-20
Scope: Change of height to a different vertical reference surface and unit.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
CONCATENATEDOPERATION["NGVD29 height (ftUS) to NAVD88 height (1)", VERSION["IOGP - US Conus W"], SOURCECRS[ VERTCRS["NGVD29 height (ftUS)", VDATUM["National Geodetic Vertical Datum 1929"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["US survey foot",0.304800609601219]], ID["EPSG",5702]]], TARGETCRS[ VERTCRS["NAVD88 height", VDATUM["North American Vertical Datum 1988"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], ID["EPSG",5703]]], STEP[ CONVERSION["Vertical Axis Unit Conversion", METHOD["Change of Vertical Unit", ID["EPSG",1104]], ID["EPSG",7813]]], STEP[ COORDINATEOPERATION["NGVD29 height (m) to NAVD88 height (1)", VERSION["NGS-US Conus W"], SOURCECRS[ VERTCRS["NGVD29 height (m)", VDATUM["National Geodetic Vertical Datum 1929"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], ID["EPSG",7968]]], TARGETCRS[ VERTCRS["NAVD88 height", VDATUM["North American Vertical Datum 1988"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], ID["EPSG",5703]]], METHOD["Vertical Offset by Grid Interpolation (VERTCON)", ID["EPSG",9658]], PARAMETERFILE["Vertical offset file","vertconw.94"], OPERATIONACCURACY[0.02], ID["EPSG",7969], REMARK["In this area the NGVD29 vertical reference surface is approximately 0.6 to 1.6m below the NAVD88 datum surface. Interpolation within the gridded data file may be made using either NAD27 or any of the realizations of NAD83 applicable to US conus."]]], OPERATIONACCURACY[0.02], USAGE[ SCOPE["Change of height to a different vertical reference surface and unit."], AREA["United States (USA) - CONUS west of 107°W - onshore - Arizona; California; Colorado; Idaho; Montana; Nevada; New Mexico; Oregon; Utah; Washington; Wyoming."], BBOX[31.33,-124.79,49.05,-107]], ID["EPSG",7973]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ConcatenatedOperation", "name": "NGVD29 height (ftUS) to NAVD88 height (1)", "source_crs": { "type": "VerticalCRS", "name": "NGVD29 height (ftUS)", "datum": { "type": "VerticalReferenceFrame", "name": "National Geodetic Vertical Datum 1929" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": { "type": "LinearUnit", "name": "US survey foot", "conversion_factor": 0.304800609601219 } } ] }, "id": { "authority": "EPSG", "code": 5702 } }, "target_crs": { "type": "VerticalCRS", "name": "NAVD88 height", "datum": { "type": "VerticalReferenceFrame", "name": "North American Vertical Datum 1988" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5703 } }, "steps": [ { "type": "Conversion", "name": "Vertical Axis Unit Conversion", "method": { "name": "Change of Vertical Unit", "id": { "authority": "EPSG", "code": 1104 } }, "id": { "authority": "EPSG", "code": 7813 } }, { "type": "Transformation", "name": "NGVD29 height (m) to NAVD88 height (1)", "source_crs": { "type": "VerticalCRS", "name": "NGVD29 height (m)", "datum": { "type": "VerticalReferenceFrame", "name": "National Geodetic Vertical Datum 1929" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 7968 } }, "target_crs": { "type": "VerticalCRS", "name": "NAVD88 height", "datum": { "type": "VerticalReferenceFrame", "name": "North American Vertical Datum 1988" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5703 } }, "method": { "name": "Vertical Offset by Grid Interpolation (VERTCON)", "id": { "authority": "EPSG", "code": 9658 } }, "parameters": [ { "name": "Vertical offset file", "value": "vertconw.94", "id": { "authority": "EPSG", "code": 8732 } } ], "accuracy": "0.02", "id": { "authority": "EPSG", "code": 7969 }, "remarks": "In this area the NGVD29 vertical reference surface is approximately 0.6 to 1.6m below the NAVD88 datum surface. Interpolation within the gridded data file may be made using either NAD27 or any of the realizations of NAD83 applicable to US conus." } ], "accuracy": "0.02", "scope": "Change of height to a different vertical reference surface and unit.", "area": "United States (USA) - CONUS west of 107°W - onshore - Arizona; California; Colorado; Idaho; Montana; Nevada; New Mexico; Oregon; Utah; Washington; Wyoming.", "bbox": { "south_latitude": 31.33, "west_longitude": -124.79, "north_latitude": 49.05, "east_longitude": -107 }, "id": { "authority": "EPSG", "code": 7973 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=pipeline +step +proj=unitconvert +z_in=us-ft +z_out=m +step +proj=vgridshift +grids=us_noaa_vertconw.tif +multiplier=1"> <Layer srs="+proj=pipeline +step +proj=unitconvert +z_in=us-ft +z_out=m +step +proj=vgridshift +grids=us_noaa_vertconw.tif +multiplier=1"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 7973, 'EPSG', 7973, '+proj=pipeline +step +proj=unitconvert +z_in=us-ft +z_out=m +step +proj=vgridshift +grids=us_noaa_vertconw.tif +multiplier=1', 'None');
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