Geodetic CRS: NGVD29 height (ftUS)
Datum: National Geodetic Vertical Datum 1929
Data source: EPSG
Information source: National Geodetic Survey, www.ngs.noaa.gov
Revision date: 2008-03-14
Scope: Transformation of coordinates at 0.02m level of accuracy.
Remarks: Interpolation within the gridded data file may be made using any of the horizontal CRSs NAD27, NAD83 or NAD83(HARN).
Method: Vertical Offset by Grid Interpolation (VERTCON)
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["NGVD29 height to NAVD88 height (2)", VERSION["NGS-US Conus C"], 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]]], METHOD["Vertical Offset by Grid Interpolation (VERTCON)", ID["EPSG",9658]], PARAMETERFILE["Vertical offset file","vertconc.94"], OPERATIONACCURACY[0.02], USAGE[ SCOPE["Transformation of coordinates at 0.02m level of accuracy."], AREA["United States (USA) - CONUS between 89°W and 107°W - onshore - Arkansas; Colorado; Illinois; Iowa; Kansas; Louisiana; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; New Mexico; North Dakota; Oklahoma; South Dakota; Tennessee; Texas; Wisconsin; Wyoming."], BBOX[25.83,-107,49.38,-89]], ID["EPSG",5410], REMARK["Interpolation within the gridded data file may be made using any of the horizontal CRSs NAD27, NAD83 or NAD83(HARN)."]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Transformation", "name": "NGVD29 height to NAVD88 height (2)", "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 } }, "method": { "name": "Vertical Offset by Grid Interpolation (VERTCON)", "id": { "authority": "EPSG", "code": 9658 } }, "parameters": [ { "name": "Vertical offset file", "value": "vertconc.94", "id": { "authority": "EPSG", "code": 8732 } } ], "accuracy": "0.02", "scope": "Transformation of coordinates at 0.02m level of accuracy.", "area": "United States (USA) - CONUS between 89°W and 107°W - onshore - Arkansas; Colorado; Illinois; Iowa; Kansas; Louisiana; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; New Mexico; North Dakota; Oklahoma; South Dakota; Tennessee; Texas; Wisconsin; Wyoming.", "bbox": { "south_latitude": 25.83, "west_longitude": -107, "north_latitude": 49.38, "east_longitude": -89 }, "id": { "authority": "EPSG", "code": 5410 }, "remarks": "Interpolation within the gridded data file may be made using any of the horizontal CRSs NAD27, NAD83 or NAD83(HARN)." }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=vgridshift +grids=us_noaa_vertconc.tif +multiplier=1"> <Layer srs="+proj=vgridshift +grids=us_noaa_vertconc.tif +multiplier=1"> </Layer> </Map>