EPSG:4990

Lao 1993

Attributes

Unit: metre

Geodetic CRS: Lao 1993

Datum: Lao 1993

Ellipsoid: Krassowsky 1940

Prime meridian: Greenwich

Data source: EPSG

Information source: National Geographic Department

Revision date: 2004-04-27

Scope: Geodesy.

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

Area of use: Laos.

Coordinate system: Cartesian 3D CS (geocentric). Axes: geocentric X Y Z. Orientations: X and Y in equatorial plane, X positive through intersection with prime meridian, Y through 0°N 90°E. Z axis parallel to mean earth rotation axis and positive towards North Pole. UoM: m.

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SimpleMap

Center coordinates
-1452388.8 5884194.27

Projected bounds:
-1876436.49 5618410.05
-1032903.97 6096358.18

WGS84 bounds:
100.09 13.92
107.64 22.5

Laos.
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Definition: OGC Well Known Text

GEOCCS["Lao 1993",
    DATUM["Lao_1993",
        SPHEROID["Krassowsky 1940",6378245,298.3,
            AUTHORITY["EPSG","7024"]],
        AUTHORITY["EPSG","6677"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Geocentric X",OTHER],
    AXIS["Geocentric Y",OTHER],
    AXIS["Geocentric Z",NORTH],
    AUTHORITY["EPSG","4990"]]

Definition: OGC Well Known Text 2 (2019)

GEODCRS["Lao 1993",
    DATUM["Lao 1993",
        ELLIPSOID["Krassowsky 1940",6378245,298.3,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Greenwich",0,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[Cartesian,3],
        AXIS["(X)",geocentricX,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["(Y)",geocentricY,
            ORDER[2],
            LENGTHUNIT["metre",1]],
        AXIS["(Z)",geocentricZ,
            ORDER[3],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy."],
        AREA["Laos."],
        BBOX[13.92,100.09,22.5,107.64]],
    ID["EPSG",4990]]

Definition: PROJ.4

+proj=geocent +ellps=krass +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4990","+proj=geocent +ellps=krass +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeodeticCRS",
    "name": "Lao 1993",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Lao 1993",
        "ellipsoid": {
            "name": "Krassowsky 1940",
            "semi_major_axis": 6378245,
            "inverse_flattening": 298.3
        }
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Geocentric X",
                "abbreviation": "X",
                "direction": "geocentricX",
                "unit": "metre"
            },
            {
                "name": "Geocentric Y",
                "abbreviation": "Y",
                "direction": "geocentricY",
                "unit": "metre"
            },
            {
                "name": "Geocentric Z",
                "abbreviation": "Z",
                "direction": "geocentricZ",
                "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": 4990
    }
}

Definition: GeoServer

4990=GEOCCS["Lao 1993",DATUM["Lao_1993",SPHEROID["Krassowsky 1940",6378245,298.3,AUTHORITY["EPSG","7024"]],AUTHORITY["EPSG","6677"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","4990"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=geocent"
	"ellps=krass"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

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

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4990, 'EPSG', 4990, '+proj=geocent +ellps=krass +units=m +no_defs +type=crs', 'GEOCCS["Lao 1993",DATUM["Lao_1993",SPHEROID["Krassowsky 1940",6378245,298.3,AUTHORITY["EPSG","7024"]],AUTHORITY["EPSG","6677"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","4990"]]');