projected
United States Geological Survey, Western Geographic Science Center
2009-02-10
true
false
http://www.opengis.net/def/crs/EPSG/0/2163
US National Atlas Equal Area
Uses spherical projection formulae. USGS documentation describes sphere as derived from GRS80/WGS84 ellipsoid but that actually used is Clarke 1866. For 1:1million and smaller scale maps there is no significant difference.
United States (USA) - onshore and offshore.
167.65
-65.69
15.56
74.71
ISO 3166 Maintenance Agency. ftp://ftp.fu-berlin.de/pub/doc/iso
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1245
USA
Area crosses 180-degree meridian.
US
USA
840
For small scale (1:1million and smaller) statistical mapping.
conversion
United States Geological Survey, Western Geographic Science Center.
2009-02-04
true
false
http://www.opengis.net/def/coordinateOperation/EPSG/0/3899
US National Atlas Equal Area
United States (USA) - onshore and offshore.
167.65
-65.69
15.56
74.71
ISO 3166 Maintenance Agency. ftp://ftp.fu-berlin.de/pub/doc/iso
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1245
USA
Area crosses 180-degree meridian.
US
USA
840
Statistical mapping
USGS Professional Paper 1395, "Map Projections - A Working Manual" by John P. Snyder.
2009-06-07
true
false
true
See information source.
http://www.opengis.net/def/method/EPSG/0/1027
Lambert Azimuthal Equal Area (Spherical)
This is the spherical form of the projection. See coordinate operation method Lambert Azimuthal Equal Area (code 9820) for ellipsoidal form. Differences of several tens of metres result from comparison of the two methods.
See information source.
R is the radius of the sphere and will normally be one of the CRS parameters. If the figure of the earth used is an ellipsoid rather than a sphere then R should be calculated as the radius of the authalic sphere using the formula for RA given in EPSG Guidance Note 7-2, section 1.2, table 3. Note however that if applying spherical formula to ellipsoidal coordinates, the authalic projection properties are not preserved.
45
EPSG guidance note number 7.
1999-09-09
false
The latitude of the point from which the values of both the geographical coordinates on the ellipsoid and the grid coordinates on the projection are deemed to increment or decrement for computational purposes. Alternatively it may be considered as the latitude of the point which in the absence of application of false coordinates has grid coordinates of (0,0).
http://www.opengis.net/def/parameter/EPSG/0/8801
Latitude of natural origin
-100
Abbeviated as "CM".
Abbreviation for "Central Meridian".
EPSG guidance note number 7.
2002-06-22
false
The longitude of the point from which the values of both the geographical coordinates on the ellipsoid and the grid coordinates on the projection are deemed to increment or decrement for computational purposes. Alternatively it may be considered as the longitude of the point which in the absence of application of false coordinates has grid coordinates of (0,0). Sometimes known as "central meridian (CM)".
http://www.opengis.net/def/parameter/EPSG/0/8802
Longitude of natural origin
0
This alias applies only in the case of projection methods which have an axis positive west, e.g. Transverse Mercator (South Orientated).
EPSG guidance note number 7.
2002-07-31
false
Since the natural origin may be at or near the centre of the projection and under normal coordinate circumstances would thus give rise to negative coordinates over parts of the mapped area, this origin is usually given false coordinates which are large enough to avoid this inconvenience. The False Easting, FE, is the value assigned to the abscissa (east or west) axis of the projection grid at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8806
False easting
0
This alias applies only in the case of projection methods which have an axis positive south, e.g. Transverse Mercator (South Orientated).
EPSG guidance note number 7.
2002-07-31
false
Since the natural origin may be at or near the centre of the projection and under normal coordinate circumstances would thus give rise to negative coordinates over parts of the mapped area, this origin is usually given false coordinates which are large enough to avoid this inconvenience. The False Northing, FN, is the value assigned to the ordinate (north or south) axis of the projection grid at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8807
False northing
geographic 2D
OGP
2004-04-27
false
false
http://www.opengis.net/def/crs/EPSG/0/4052
Unspecified datum based upon the Clarke 1866 Authalic Sphere
Use only in cases where geodetic datum is unknown.
Not specified.
-180
180
-90
90
OGP
2000-06-23
false
false
http://www.opengis.net/def/area/EPSG/0/1263
Not specified
Small scale statistical mapping.
ellipsoidal
OGP
2008-06-23
false
http://www.opengis.net/def/cs/EPSG/0/6422
Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree
Coordinates referenced to this CS are in degrees. Any degree representation (e.g. DMSH, decimal, etc.) may be used but that used must be declared for the user by the supplier of data. Used in geographic 2D coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/106
Lat
north
http://www.opengis.net/def/axis/EPSG/0/107
Long
east
geodetic
OGP
2004-04-27
false
http://www.opengis.net/def/datum/EPSG/0/6052
Not specified (based on Clarke 1866 Authalic Sphere)
Included for coordinate reference systems where datum is unknown.
Not a valid datum.
Cartesian
OGP
2001-04-29
false
http://www.opengis.net/def/cs/EPSG/0/4499
Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.
Used in projected and engineering coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/41
X
east
http://www.opengis.net/def/axis/EPSG/0/42
Y
north