EPSG:9311 — NAD27 / US National Atlas Equal Area

Projected · USA

Export Formats

OGC WKT

PROJCS[
    "NAD27 / US National Atlas Equal Area",
    GEOGCS[
        "NAD27",
        DATUM[
            "North_American_Datum_1927",
            SPHEROID["Clarke 1866",6378206.4,294.978698213898],
            EXTENSION["PROJ4_GRIDS","NTv2_0.gsb"]
        ],
        PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4267"]
    ],
    PROJECTION["Lambert_Azimuthal_Equal_Area"],
    PARAMETER["latitude_of_center",45],
    PARAMETER["longitude_of_center",-100],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    UNIT["metre",1,AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","9311"]
]

WKT2

PROJCRS[
    "NAD27 / US National Atlas Equal Area",
    BASEGEOGCRS[
        "NAD27",
        DATUM[
            "North American Datum 1927",
            ELLIPSOID[
                "Clarke 1866",
                6378206.4,
                294.978698213898,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7008]
            ],
            ID["EPSG",6267]
        ],
        ID["EPSG",4267]
    ],
    CONVERSION[
        "US National Atlas Equal Area",
        METHOD["Lambert Azimuthal Equal Area (Spherical)",ID["EPSG",1027]],
        PARAMETER[
            "Latitude of natural origin",
            45,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            -100,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "False easting",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",3899]
    ],
    CS[Cartesian,2,ID["EPSG",4499]],
    AXIS["Easting (X)",east],
    AXIS["Northing (Y)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",9311]
]

PROJ.4

+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +nadgrids=NTv2_0.gsb +units=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:9311", "+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +nadgrids=NTv2_0.gsb +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 9311,
  "name": "NAD27 / US National Atlas Equal Area",
  "kind": "projected",
  "area": "USA",
  "unit": "metre",
  "bbox": [
    15.56,
    167.65,
    74.71,
    -65.69
  ],
  "proj4": "+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +nadgrids=NTv2_0.gsb +units=m +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 (9311, 'EPSG', 9311, '+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +nadgrids=NTv2_0.gsb +units=m +no_defs +type=crs', 'PROJCS["NAD27 / US National Atlas Equal Area",GEOGCS["NAD27",DATUM["North_American_Datum_1927",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","NTv2_0.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4267"]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",45],PARAMETER["longitude_of_center",-100],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9311"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=laea"
  "+lat_0=45"
  "+lon_0=-100"
  "+x_0=0"
  "+y_0=0"
  "+ellps=clrk66"
  "+nadgrids=NTv2_0.gsb"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

9311=PROJCS["NAD27 / US National Atlas Equal Area",GEOGCS["NAD27",DATUM["North_American_Datum_1927",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","NTv2_0.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4267"]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",45],PARAMETER["longitude_of_center",-100],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9311"]]

Related Coordinate Systems

Available Transformations (168)

Transformations inherited from base CRS: EPSG:4267 (NAD27)

Transformation	Source → Target	Accuracy (m)
NAD27 to NAD83 (1)	4267 → 4269	0.15
NAD27 to NAD83 (7)	4267 → 4269	0.15
NAD27 to NAD83(HARN) (22)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (1)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (2)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (3)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (4)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (5)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (6)	4267 → 4152	0.2
NAD27 to NAD83(HARN) (7)	4267 → 4152	0.2

Other CRS for US

Other CRS using North American Datum 1927 (194)

Frequently Asked Questions

How do I add EPSG:9311 to GeoServer?

Add the following definition to your GeoServer configuration:

9311=PROJCS["NAD27 / US National Atlas Equal Area",GEOGCS["NAD27",DATUM["North_American_Datum_1927",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","NTv2_0.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4267"]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",45],PARAMETER["longitude_of_center",-100],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9311"]]

Read the full GeoServer guide →

How do I add EPSG:9311 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (9311, 'EPSG', 9311, '+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +nadgrids=NTv2_0.gsb +units=m +no_defs +type=crs', 'PROJCS["NAD27 / US National Atlas Equal Area",GEOGCS["NAD27",DATUM["North_American_Datum_1927",SPHEROID["Clarke 1866",6378206.4,294.978698213898],EXTENSION["PROJ4_GRIDS","NTv2_0.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4267"]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",45],PARAMETER["longitude_of_center",-100],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9311"]]');

Read the full PostGIS guide →

How do I add EPSG:9311 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=laea"
  "+lat_0=45"
  "+lon_0=-100"
  "+x_0=0"
  "+y_0=0"
  "+ellps=clrk66"
  "+nadgrids=NTv2_0.gsb"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:9311 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:9311", "+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +nadgrids=NTv2_0.gsb +units=m +no_defs +type=crs");

Read the full Proj4js guide →