EPSG:4609 — NAD27(CGQ77)

Geographic 2D · Canada - Quebec

Export Formats

OGC WKT

GEOGCS[
    "NAD27(CGQ77)",
    DATUM[
        "North_American_Datum_1927_CGQ77",
        SPHEROID["Clarke 1866",6378206.4,294.978698213898],
        EXTENSION["PROJ4_GRIDS","CQ77NA83.GSB"]
    ],
    PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4609"]
]

WKT2

GEOGCRS[
    "NAD27(CGQ77)",
    DATUM[
        "North American Datum 1927 (CGQ77)",
        ELLIPSOID[
            "Clarke 1866",
            6378206.4,
            294.978698213898,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",7008]
        ],
        ID["EPSG",6609]
    ],
    CS[ellipsoidal,2,ID["EPSG",6422]],
    AXIS["Geodetic latitude (Lat)",north],
    AXIS["Geodetic longitude (Lon)",east],
    ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
    ID["EPSG",4609]
]

PROJ.4

+proj=longlat +ellps=clrk66 +nadgrids=CQ77NA83.GSB +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:4609", "+proj=longlat +ellps=clrk66 +nadgrids=CQ77NA83.GSB +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 4609,
  "name": "NAD27(CGQ77)",
  "kind": "geographic 2D",
  "area": "Canada - Quebec",
  "unit": "degree (supplier to define representation)",
  "bbox": [
    44.99,
    -79.85,
    62.62,
    -57.1
  ],
  "proj4": "+proj=longlat +ellps=clrk66 +nadgrids=CQ77NA83.GSB +no_defs +type=crs"
}

PostGIS

How to add a projection to PostGIS? →

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4609, 'EPSG', 4609, '+proj=longlat +ellps=clrk66 +nadgrids=CQ77NA83.GSB +no_defs +type=crs', 'GEOGCS["NAD27(CGQ77)",DATUM["North_American_Datum_1927_CGQ77",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","CQ77NA83.GSB"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4609"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=longlat"
  "+ellps=clrk66"
  "+nadgrids=CQ77NA83.GSB"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

4609=GEOGCS["NAD27(CGQ77)",DATUM["North_American_Datum_1927_CGQ77",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","CQ77NA83.GSB"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4609"]]

Related Coordinate Systems

Available Transformations (8)

Transformation	Source → Target	Accuracy (m)
NAD27(CGQ77) to NAD83 (1)	4609 → 4269	1
NAD27(CGQ77) to NAD83 (2)	4609 → 4269	1.5
NAD27(CGQ77) to WGS 84 (3)	4609 → 4326	1.5
NAD27(CGQ77) to NAD83(CSRS)v2 (1)	4609 → 8237	1.5
NAD27(CGQ77) to NAD83(CSRS98) (1) Deprecated	4609 → 4140	—
NAD27(CGQ77) to NAD83(CSRS) (1) Deprecated	4609 → 4617	1.5
NAD27(CGQ77) to WGS 84 (1) Deprecated	4609 → 4326	—
NAD27(CGQ77) to WGS 84 (2) Deprecated	4609 → 4326	—

Other CRS using North American Datum 1927 (CGQ77) (14)

Frequently Asked Questions

How do I add EPSG:4609 to GeoServer?

Add the following definition to your GeoServer configuration:

4609=GEOGCS["NAD27(CGQ77)",DATUM["North_American_Datum_1927_CGQ77",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","CQ77NA83.GSB"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4609"]]

Read the full GeoServer guide →

How do I add EPSG:4609 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4609, 'EPSG', 4609, '+proj=longlat +ellps=clrk66 +nadgrids=CQ77NA83.GSB +no_defs +type=crs', 'GEOGCS["NAD27(CGQ77)",DATUM["North_American_Datum_1927_CGQ77",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","CQ77NA83.GSB"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4609"]]');

Read the full PostGIS guide →

How do I add EPSG:4609 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=longlat"
  "+ellps=clrk66"
  "+nadgrids=CQ77NA83.GSB"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:4609 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:4609", "+proj=longlat +ellps=clrk66 +nadgrids=CQ77NA83.GSB +no_defs +type=crs");

Read the full Proj4js guide →