EPSG:6188

Lisbon to ETRS89-PRT [1995] (4)

Attributes

Geodetic CRS: Lisbon

Datum: Lisbon 1937

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: Instituto Geografico Portugues; http://www.igeo.pt

Revision date: 2025-10-17

Scope: Transformation of coordinates at 0.1m level of accuracy.

Remarks: Derived from 1129 common stations in the national geodetic network. Residuals at 130 further test points average 0.09m, maximum 0.30m.

Method: NTv2

Area of use: Portugal - mainland - onshore.

Description: (0,)

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Portugal - mainland - onshore.

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Definition: OGC Well Known Text 2 (2019)

COORDINATEOPERATION["Lisbon to ETRS89-PRT [1995] (4)",
    VERSION["IGP-Prt 0.1m"],
    SOURCECRS[
        GEOGCRS["Lisbon",
            DATUM["Lisbon 1937",
                ELLIPSOID["International 1924",6378388,297,
                    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]],
            ID["EPSG",4207]]],
    TARGETCRS[
        GEOGCRS["ETRS89-PRT [1995]",
            DATUM["ETRS89-PRT [1995]",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]],
                ANCHOREPOCH[1995.4]],
            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]],
            ID["EPSG",11108]]],
    METHOD["NTv2",
        ID["EPSG",9615]],
    PARAMETERFILE["Latitude and longitude difference file","DLx_ETRS89_geo.gsb"],
    OPERATIONACCURACY[0.1],
    USAGE[
        SCOPE["Transformation of coordinates at 0.1m level of accuracy."],
        AREA["Portugal - mainland - onshore."],
        BBOX[36.95,-9.56,42.16,-6.19]],
    ID["EPSG",6188],
    REMARK["Derived from 1129 common stations in the national geodetic network. Residuals at 130 further test points average 0.09m, maximum 0.30m."]]

Definition: PROJ.4

+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=pt_dgt_DLx_ETRS89_geo.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:6188","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=pt_dgt_DLx_ETRS89_geo.tif +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": "Lisbon to ETRS89-PRT [1995] (4)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "Lisbon",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Lisbon 1937",
            "ellipsoid": {
                "name": "International 1924",
                "semi_major_axis": 6378388,
                "inverse_flattening": 297
            }
        },
        "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": 4207
        },
        "remarks": "Replaces Lisbon 1890 system which used Bessel 1841 ellipsoid (code 4666). Replaced by Datum 73 (code 4274)."
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "ETRS89-PRT [1995]",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "ETRS89-PRT [1995]",
            "anchor_epoch": 1995.4,
            "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": 11108
        },
        "remarks": "Horizontal component of national realization of ETRS89 in continental Portugal."
    },
    "method": {
        "name": "NTv2",
        "id": {
            "authority": "EPSG",
            "code": 9615
        }
    },
    "parameters": [
        {
            "name": "Latitude and longitude difference file",
            "value": "DLx_ETRS89_geo.gsb",
            "id": {
                "authority": "EPSG",
                "code": 8656
            }
        }
    ],
    "accuracy": "0.1",
    "scope": "Transformation of coordinates at 0.1m level of accuracy.",
    "area": "Portugal - mainland - onshore.",
    "bbox": {
        "south_latitude": 36.95,
        "west_longitude": -9.56,
        "north_latitude": 42.16,
        "east_longitude": -6.19
    },
    "id": {
        "authority": "EPSG",
        "code": 6188
    },
    "remarks": "Derived from 1129 common stations in the national geodetic network. Residuals at 130 further test points average 0.09m, maximum 0.30m."
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=pipeline"
	"step"
	"proj=axisswap"
	"order=2,1"
	"step"
	"proj=unitconvert"
	"xy_in=deg"
	"xy_out=rad"
	"step"
	"proj=hgridshift"
	"grids=pt_dgt_DLx_ETRS89_geo.tif"
	"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 +proj=hgridshift +grids=pt_dgt_DLx_ETRS89_geo.tif +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 +proj=hgridshift +grids=pt_dgt_DLx_ETRS89_geo.tif +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 ( 6188, 'EPSG', 6188, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=pt_dgt_DLx_ETRS89_geo.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');