EPSG:4991

Lao 1993

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Lao 1993

Datum: Lao 1993

Ellipsoid: Krassowsky 1940

Prime meridian: Greenwich

Data source: EPSG

Information source: National Geographic Department

Revision date: 2007-08-27

Scope: Geodesy.

Remarks: Replaced by Lao 1997. Lao 1993 coordinate values are within 1m of Lao 1997 values.

Area of use: Laos.

Coordinate system: Ellipsoidal 3D CS. Axes: latitude, longitude, ellipsoidal height. Orientations: north, east, up. UoM: degree, degree, metre.

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SimpleMap

Center coordinates
103.87 18.21

Projected bounds:
100.09 13.92
107.64 22.5

WGS84 bounds:
100.09 13.92
107.64 22.5

Laos.
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Definition: OGC Well Known Text 2 (2019)

GEOGCRS["Lao 1993",
    DATUM["Lao 1993",
        ELLIPSOID["Krassowsky 1940",6378245,298.3,
            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]],
    USAGE[
        SCOPE["Geodesy."],
        AREA["Laos."],
        BBOX[13.92,100.09,22.5,107.64]],
    ID["EPSG",4991]]

Definition: ESRI Well Known Text

GEOGCS["Lao_1993_3D",
    DATUM["D_Lao_1993",
        SPHEROID["Krasovsky_1940",6378245.0,298.3]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433],
    LINUNIT["Meter",1.0]]

Definition: PROJ.4

+proj=longlat +ellps=krass +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4991","+proj=longlat +ellps=krass +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "Lao 1993",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Lao 1993",
        "ellipsoid": {
            "name": "Krassowsky 1940",
            "semi_major_axis": 6378245,
            "inverse_flattening": 298.3
        }
    },
    "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"
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "Laos.",
    "bbox": {
        "south_latitude": 13.92,
        "west_longitude": 100.09,
        "north_latitude": 22.5,
        "east_longitude": 107.64
    },
    "id": {
        "authority": "EPSG",
        "code": 4991
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=krass"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=krass +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=krass +no_defs +type=crs">
	</Layer>
</Map>