EPSG:28991

Amersfoort / RD Old

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Available transformations
to EPSG:11037
EPSG:11037 - ETRS89-NLD [AGRS2010]

Selected transformation

Name: Amersfoort to ETRS89-NLD [AGRS2010] (9)

Method: NTv2

Grid Files: rdtrans2018.gsb

Remarks: Defines Amersfoort (also known as RD Bessel). Horizontal component of official transformation RDNAPTRANS(TM)2018. Replaces Amersfoort to ETRS89 (7) (CT code 7000).

Information source: NSGI: Netherlands partnership of Kadaster, Rijkswaterstaat and Hydrographic Service, http://www.nsgi.nl/

Revision date: 2025-12-25

Attributes

Unit: metre

Geodetic CRS: Amersfoort

Datum: Amersfoort

Ellipsoid: Bessel 1841

Prime meridian: Greenwich

Data source: EPSG

Information source: NSGI: Netherlands Partnership of Kadaster, Rijkswaterstaat and Hydrographic Service, http://www.nsgi.nl/.

Revision date: 2026-01-06

Scope: Cadastre, engineering survey, topographic mapping.

Remarks: Replaced by Amersfoort / RD New (CRS code 28992).

Area of use: Netherlands - onshore and offshore.

Coordinate system: Cartesian 2D CS. Axes: easting, northing (x,y). Orientations: east, north. UoM: m.

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SimpleMap

Center coordinates
-34181.19 123060.23

Projected bounds:
-201622.03 -156325.38
129347.25 406062.9

WGS84 bounds:
2.53 50.75
7.22 55.77

Netherlands - onshore and offshore.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        PROJCRS["Amersfoort / RD Old",
            BASEGEOGCRS["Amersfoort",
                DATUM["Amersfoort",
                    ELLIPSOID["Bessel 1841",6377397.155,299.1528128,
                        LENGTHUNIT["metre",1]]],
                PRIMEM["Greenwich",0,
                    ANGLEUNIT["degree",0.0174532925199433]],
                ID["EPSG",4289]],
            CONVERSION["RD Old",
                METHOD["Oblique Stereographic",
                    ID["EPSG",9809]],
                PARAMETER["Latitude of natural origin",52.1561605555556,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8801]],
                PARAMETER["Longitude of natural origin",5.38763888888889,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8802]],
                PARAMETER["Scale factor at natural origin",0.9999079,
                    SCALEUNIT["unity",1],
                    ID["EPSG",8805]],
                PARAMETER["False easting",0,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8806]],
                PARAMETER["False northing",0,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8807]]],
            CS[Cartesian,2],
                AXIS["easting (x)",east,
                    ORDER[1],
                    LENGTHUNIT["metre",1]],
                AXIS["northing (y)",north,
                    ORDER[2],
                    LENGTHUNIT["metre",1]],
            USAGE[
                SCOPE["Cadastre, engineering survey, topographic mapping."],
                AREA["Netherlands - onshore and offshore."],
                BBOX[50.75,2.53,55.77,7.22]],
            ID["EPSG",28991]]],
    TARGETCRS[
        GEOGCRS["ETRS89-NLD [AGRS2010]",
            DATUM["AGRS2010 (ETRF2000)",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]],
                ANCHOREPOCH[2010.5]],
            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]],
            USAGE[
                SCOPE["Horizontal component of 3D system."],
                AREA["Netherlands - onshore and offshore."],
                BBOX[50.75,2.53,55.77,7.22]],
            ID["EPSG",11037],
            REMARK["Horizontal component of national realization of ETRS89 in the Netherlands, aligned to ETRF2000."]]],
    ABRIDGEDTRANSFORMATION["Amersfoort to ETRS89-NLD [AGRS2010] (9)",
        METHOD["NTv2",
            ID["EPSG",9615]],
        PARAMETERFILE["Latitude and longitude difference file","rdtrans2018.gsb"],
        USAGE[
            SCOPE["Horizontal component of official 3D RDNAPTRANS(TM)2018 transformation. Accuracy by definition exact."],
            AREA["Netherlands - onshore and offshore."],
            BBOX[50.75,2.53,55.77,7.22]],
        ID["EPSG",9282],
        REMARK["Defines Amersfoort (also known as RD Bessel). Horizontal component of official transformation RDNAPTRANS(TM)2018. Replaces Amersfoort to ETRS89 (7) (CT code 7000)."]]]

Definition: PROJ.4

+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=0 +y_0=0 +ellps=bessel +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:28991","+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=0 +y_0=0 +ellps=bessel +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "ProjectedCRS",
        "name": "Amersfoort / RD Old",
        "base_crs": {
            "type": "GeographicCRS",
            "name": "Amersfoort",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "Amersfoort",
                "ellipsoid": {
                    "name": "Bessel 1841",
                    "semi_major_axis": 6377397.155,
                    "inverse_flattening": 299.1528128
                }
            },
            "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": 4289
            },
            "remarks": "Use of geographic2D CRS Amersfoort (code 4289) for spatial referencing is discouraged. Use projected CRS Amersfoort / RD New (code 28992) or ETRS89-NLD [AGRS2010] (code 11037)."
        },
        "conversion": {
            "name": "RD Old",
            "method": {
                "name": "Oblique Stereographic",
                "id": {
                    "authority": "EPSG",
                    "code": 9809
                }
            },
            "parameters": [
                {
                    "name": "Latitude of natural origin",
                    "value": 52.1561605555556,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8801
                    }
                },
                {
                    "name": "Longitude of natural origin",
                    "value": 5.38763888888889,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8802
                    }
                },
                {
                    "name": "Scale factor at natural origin",
                    "value": 0.9999079,
                    "unit": "unity",
                    "id": {
                        "authority": "EPSG",
                        "code": 8805
                    }
                },
                {
                    "name": "False easting",
                    "value": 0,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8806
                    }
                },
                {
                    "name": "False northing",
                    "value": 0,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8807
                    }
                }
            ]
        },
        "coordinate_system": {
            "subtype": "Cartesian",
            "axis": [
                {
                    "name": "Easting",
                    "abbreviation": "x",
                    "direction": "east",
                    "unit": "metre"
                },
                {
                    "name": "Northing",
                    "abbreviation": "y",
                    "direction": "north",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 28991
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "ETRS89-NLD [AGRS2010]",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "AGRS2010 (ETRF2000)",
            "anchor_epoch": 2010.5,
            "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": 11037
        },
        "remarks": "Horizontal component of national realization of ETRS89 in the Netherlands, aligned to ETRF2000."
    },
    "transformation": {
        "name": "Amersfoort to ETRS89-NLD [AGRS2010] (9)",
        "method": {
            "name": "NTv2",
            "id": {
                "authority": "EPSG",
                "code": 9615
            }
        },
        "parameters": [
            {
                "name": "Latitude and longitude difference file",
                "value": "rdtrans2018.gsb",
                "id": {
                    "authority": "EPSG",
                    "code": 8656
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 9282
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=sterea"
	"lat_0=52.1561605555556"
	"lon_0=5.38763888888889"
	"k=0.9999079"
	"x_0=0"
	"y_0=0"
	"ellps=bessel"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=0 +y_0=0 +ellps=bessel +units=m +no_defs +type=crs">
	<Layer srs="+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=0 +y_0=0 +ellps=bessel +units=m +no_defs +type=crs">
	</Layer>
</Map>