EPSG:9311

NAD27 / US National Atlas Equal Area

Available transformations
to EPSG:4326

Selected transformation

Grid Files: NTv2_0.gsb

Remarks:

Information source: Various oil industry sources.

Revision date: 2020-03-14

Attributes

Unit: metre

Geodetic CRS: NAD27

Datum: North American Datum 1927

Ellipsoid: Clarke 1866

Prime meridian: Greenwich

Data source: EPSG

Information source: United States Geological Survey, Western Geographic Science Center

Revision date: 2020-03-26

Scope: Statistical analysis.

Remarks: Uses spherical projection formulas. USGS documentation describes sphere as derived from GRS80/WGS 84 ellipsoid but that actually used is Clarke 1866. For 1:1million and smaller scale maps there is no significant difference.

Area of use: United States (USA) - onshore and offshore.

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

Center coordinates
inf inf

Projected bounds:
2231204.79 -23428.16
2991527.71 1011114.84

WGS84 bounds:
-67.75 40.0
-43.99 64.21

Canada - offshore Newfoundland and Labrador, New Brunswick and Nova Scotia - west of 44°W and north of 40°N.
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Definition: OGC Well Known Text 2 (2019)

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        ID["EPSG",1946],
        REMARK["Approximation derived from tfm code 6864 ignoring time-dependent parameters and assuming ITRF96(1997.0) and WGS 84 can be considered the same within the accuracy of the transformation."]]]

Definition: PROJ.4

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Definition: JavaScript (Proj4js)

proj4.defs("EPSG:9311","+proj=laea +R_A +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +ellps=clrk66 +towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0 +units=m +no_defs +type=crs");

Definition: JSON

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}

Definition: MapServer - MAPfile

PROJECTION
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	"R_A"
	"lat_0=45"
	"lon_0=-100"
	"x_0=0"
	"y_0=0"
	"ellps=clrk66"
	"towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
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