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Geodetic CRS: SHGD2015
Datum: St. Helena Geodetic Datum 2015
Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Information source: St. Helena Government, Environment and Natural Resources Directorate (ENRD).
Revision date: 2021-02-05
Scope: Reversible geoid model transformation.
Remarks: Reversible alternative to SHGD2015 to SHVD2015 height (1) (code 7891).
Method: Geog3D to Geog2D+GravityRelatedHeight (EGM2008)
Area of use: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["SHGD2015 to SHGD2015 + SHVD2015 height (1)", VERSION["ENRD-Shn Hel"], SOURCECRS[ GEOGCRS["SHGD2015", DATUM["St. Helena Geodetic Datum 2015", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,3], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], AXIS["ellipsoidal height (h)",up, ORDER[3], LENGTHUNIT["metre",1]], ID["EPSG",7885]]], TARGETCRS[ COMPOUNDCRS["SHMG2015 + SHVD2015 height", PROJCRS["SHMG2015", BASEGEOGCRS["SHGD2015", DATUM["St. Helena Geodetic Datum 2015", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",7886]], CONVERSION["UTM zone 30S", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",-3, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",0.9996, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",500000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",10000000, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1]]], VERTCRS["SHVD2015 height", VDATUM["St. Helena Vertical Datum 2015"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]]], ID["EPSG",7956]]], METHOD["Geog3D to Geog2D+GravityRelatedHeight (EGM2008)", ID["EPSG",1092]], PARAMETERFILE["Geoid (height correction) model file","Und_min2.5x2.5_egm2008_isw=82_WGS84_TideFree.gz"], INTERPOLATIONCRS[ GEOGCRS["SHGD2015", DATUM["St. Helena Geodetic Datum 2015", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]]]], OPERATIONACCURACY[0.0], USAGE[ SCOPE["Reversible geoid model transformation."], AREA["St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore."], BBOX[-16.08,-5.85,-15.85,-5.59]], ID["EPSG",9617], REMARK["Reversible alternative to SHGD2015 to SHVD2015 height (1) (code 7891)."]]
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:9617","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=us_nga_egm08_25.tif +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1");
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Transformation", "name": "SHGD2015 to SHGD2015 + SHVD2015 height (1)", "source_crs": { "type": "GeographicCRS", "name": "SHGD2015", "datum": { "type": "GeodeticReferenceFrame", "name": "St. Helena Geodetic Datum 2015", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" }, { "name": "Ellipsoidal height", "abbreviation": "h", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 7885 } }, "target_crs": { "type": "CompoundCRS", "name": "SHMG2015 + SHVD2015 height", "components": [ { "type": "ProjectedCRS", "name": "SHMG2015", "base_crs": { "name": "SHGD2015", "datum": { "type": "GeodeticReferenceFrame", "name": "St. Helena Geodetic Datum 2015", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 7886 } }, "conversion": { "name": "UTM zone 30S", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 0, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": -3, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 0.9996, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 500000, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 10000000, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "E", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "N", "direction": "north", "unit": "metre" } ] } }, { "type": "VerticalCRS", "name": "SHVD2015 height", "datum": { "type": "VerticalReferenceFrame", "name": "St. Helena Vertical Datum 2015" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] } } ], "id": { "authority": "EPSG", "code": 7956 } }, "interpolation_crs": { "type": "GeographicCRS", "name": "SHGD2015", "datum": { "type": "GeodeticReferenceFrame", "name": "St. Helena Geodetic Datum 2015", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 7886 } }, "method": { "name": "Geog3D to Geog2D+GravityRelatedHeight (EGM2008)", "id": { "authority": "EPSG", "code": 1092 } }, "parameters": [ { "name": "Geoid (height correction) model file", "value": "Und_min2.5x2.5_egm2008_isw=82_WGS84_TideFree.gz", "id": { "authority": "EPSG", "code": 8666 } } ], "accuracy": "0.0", "scope": "Reversible geoid model transformation.", "area": "St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.", "bbox": { "south_latitude": -16.08, "west_longitude": -5.85, "north_latitude": -15.85, "east_longitude": -5.59 }, "id": { "authority": "EPSG", "code": 9617 }, "remarks": "Reversible alternative to SHGD2015 to SHVD2015 height (1) (code 7891)." }
Definition: MapServer - MAPfile
PROJECTION "proj=pipeline" "step" "proj=axisswap" "order=2,1" "step" "proj=unitconvert" "xy_in=deg" "xy_out=rad" "step" "inv" "proj=vgridshift" "grids=us_nga_egm08_25.tif" "multiplier=1" "step" "proj=unitconvert" "xy_in=rad" "xy_out=deg" "step" "proj=axisswap" "order=2,1" END
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=us_nga_egm08_25.tif +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1"> <Layer srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=us_nga_egm08_25.tif +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 9617, 'EPSG', 9617, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=us_nga_egm08_25.tif +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');
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