projected
Brodzik, M. J., & Knowles, K. (2002). EASE-Grid: a versatile set of equal-area projections and grids. http://www.ncgia.ucsb.edu/globalgrids-book/ease_grid
2009-06-02
true
false
http://www.opengis.net/def/crs/EPSG/0/3408
NSIDC EASE-Grid North
Used as basis for Equal-Area Scalable Earth Grid (EASE-Grid). See information source for equations to define EASE-Grid overlay. See CRS 3973 for alternative based on WGS 84.
Northern hemisphere.
-180
180
0
90
OGP
2008-06-23
false
false
http://www.opengis.net/def/area/EPSG/0/3475
World - north of 0°N
Gridding and small scale and digital mapping for environmental sciences, including EASE-Grid.
conversion
Brodzik, M. J., & Knowles, K. (2002). EASE-Grid: a versatile set of equal-area projections and grids. http://www.ncgia.ucsb.edu/globalgrids-book/ease_grid
2009-06-02
true
false
http://www.opengis.net/def/coordinateOperation/EPSG/0/3897
US NSIDC Equal Area north projection
See information source for equations to define Equal-Area Scalable Earth Grid (EASE-Grid) overlay.
Northern hemisphere.
-180
180
0
90
OGP
2008-06-23
false
false
http://www.opengis.net/def/area/EPSG/0/3475
World - north of 0°N
Gridding including EASE-Grid and small scale digital mapping for environmental sciences in north polar region.
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.
90
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
0
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
2006-09-22
false
false
http://www.opengis.net/def/crs/EPSG/0/4053
Unspecified datum based upon the International 1924 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
2006-09-22
false
http://www.opengis.net/def/datum/EPSG/0/6053
Not specified (based on International 1924 Authalic Sphere)
Included for coordinate reference systems where datum is unknown.
Not a valid datum.
Cartesian
OGP
2008-06-23
false
http://www.opengis.net/def/cs/EPSG/0/4469
Cartesian 2D CS for north polar azimuthal lonO 0°E. Axes: X,Y. Orientations: X along 90°E, Y along 180°E meridians. UoM: m.
Used for North Pole tangential and secant projections.
http://www.opengis.net/def/axis/EPSG/0/187
X
South along 90°E
http://www.opengis.net/def/axis/EPSG/0/188
Y
South along 180°E