Index: cf-conventions/trunk/docbooksrc/appendix-f.xml
===================================================================
--- cf-conventions/trunk/docbooksrc/appendix-f.xml (revision 66)
+++ cf-conventions/trunk/docbooksrc/appendix-f.xml (revision 48)
@@ -13,7 +13,4 @@
be shared among several mappings, their definitions are contained
in a table in the final section.
- The attributes which describe the
- ellipsoid and prime meridian may be included, when applicable, with
- any grid mapping.
@@ -26,10 +23,13 @@
describing map projections.
+
-
- Albers Equal Area
+
+ Albers Equal Area
+
grid_mapping_name = albers_conical_equal_area
+
@@ -71,17 +71,20 @@
+
+
+ Notes:
+
+
+ Notes on using the PROJ.4 software package for computing the mapping may be found at http://www.remotesensing.org/geotiff/proj_list/albers_equal_area_conic.html.
+
+
+
+
+
+
-
- Notes:
-
-
- Notes on using the PROJ.4 software package for computing the mapping may be found at http://www.remotesensing.org/geotiff/proj_list/albers_equal_area_conic.html.
-
-
-
-
-
-
-
+
+
+
Azimuthal equidistant
@@ -135,7 +138,11 @@
-
-
-
+
+
+
+
+
+
+
Lambert azimuthal equal area
@@ -189,7 +196,8 @@
-
-
-
+
+
+
+
Lambert conformal
@@ -246,45 +254,18 @@
-
-
-
- Latitude-Longitude
-
-grid_mapping_name = latitude_longitude
-
-
- This grid mapping defines the canonical 2D geographical
- coordinate system based upon latitude and longitude
- coordinates on a spherical Earth. It is included so
- that the figure of the Earth can be described.
-
-
-
- Map parameters:
-
- None.
-
-
-
- Map coordinates:
-
- The rectangular coordinates are longitude and latitude
- identified by the usual conventions
- ( and ).
-
-
-
-
-
-
-
+
+
+
+
Polar stereographic
-
+
+
grid_mapping_name = polar_stereographic
-
-
-
- Map parameters:
-
+
+
+
+
+ Map parameters:
+
@@ -306,7 +287,8 @@
-
-
-
+
+
+
+
Map coordinates:
@@ -327,9 +309,11 @@
-
-
-
-
-
+
+
+
+
+
+
+
Rotated pole
@@ -337,4 +321,5 @@
grid_mapping_name = rotated_latitude_longitude
+
@@ -377,8 +362,8 @@
-
-
-
-
+
+
+
+
Stereographic
@@ -435,8 +420,8 @@
-
-
-
-
+
+
+
+
Transverse Mercator
@@ -493,85 +478,21 @@
-
+
+
-
- Vertical perspective
-
-grid_mapping_name = vertical_perspective
-
-
-
- Map parameters:
-
- latitude_of_projection_origin
- longitude_of_projection_origin
- perspective_point_height
- false_easting
- false_northing
-
-
-
- Map coordinates:
-
- The x (abscissa) and y (ordinate) rectangular coordinates
- are identified by the standard_name attribute
- value projection_x_coordinate and
- projection_y_coordinate respectively.
-
-
-
- Notes:
-
- Notes on using the PROJ.4 software packages
- for computing the mapping may be found at
- http://www.remotesensing.org/geotiff/proj_list/geos.html
- . These notes assume the point of perspective
- is directly over the equator. A more general description
- of vertical perspective projection is given in
- [Snyder], pages 169-181.
-
-
-
-
-
-
- In the following table the "Type" values are
- S for string and
- N for numeric.
-
-
-
- Grid Mapping Attributes
-
-
-
-
-
+
+ Grid Mapping Attributes
+
+
+
- Attribute
- Type
- Description
+ Attribute
+ Description
-
- earth_radius
- N
-
- Used to specify the radius, in metres, of the spherical
- figure used to approximate the shape of the Earth. This
- attribute should be specified for those projected coordinate
- reference systems in which the X-Y cartesian coordinates
- have been derived using a spherical Earth approximation. If
- the cartesian coordinates were derived using an ellipsoid,
- this attribute should not be defined. Example: "6371007",
- which is the radius of the GRS 1980 Authalic Sphere.
-
-
-
- false_easting
- N
+ false_easting
The value added to all abscissa values in the rectangular
@@ -580,10 +501,8 @@
the unit of the coordinate variable identified by the
standard name projection_x_coordinate.
-
-
-
+
+
false_northing
- N
The value added to all ordinate values in the rectangular
@@ -595,6 +514,5 @@
- grid_mapping_name
- N
+ grid_mapping_name
The name used to identify the grid mapping.
@@ -603,5 +521,4 @@
grid_north_pole_latitude
- N
True latitude (degrees_north) of the north pole of the rotated grid.
@@ -610,33 +527,10 @@
grid_north_pole_longitude
- N
True longitude (degrees_east) of the north pole of the rotated grid.
-
-
- inverse_flattening
- N
-
- Used to specify the inverse flattening
- (1/f) of the ellipsoidal figure
- associated with the geodetic datum and used to approximate the shape
- of the Earth. The flattening (f) of the ellipsoid
- is related to the semi-major and semi-minor axes by the formula
- f = (a-b)/a. In the case
- of a spherical Earth this attribute should be omitted or set to zero.
- Example: 298.257222101 for the GRS 1980 ellipsoid. (Note: By
- convention the dimensions of an ellipsoid are specified using either
- the semi-major and semi-minor axis lengths, or the semi-major axis
- length and the inverse flattening. If all three attributes are
- specified then the supplied values must be consistent with the
- aforementioned formula.)
-
-
-
latitude_of_projection_origin
- N
The latitude chosen as the origin of rectangular coordinates for a map projection.
@@ -646,5 +540,4 @@
longitude_of_central_meridian
- N
The line of longitude at the center of a map projection generally used as the basis for constructing the projection.
@@ -652,23 +545,6 @@
-
-
- longitude_of_prime_meridian
- N
-
- Specifies the longitude, with respect to Greenwich, of the prime
- meridian associated with the geodetic datum. The prime meridian defines
- the origin from which longitude values are determined. Not to be
- confused with the projection origin longitude
- (cf. longitude_of_projection_origin, a.k.a. central
- meridian) which defines the longitude of the map projection origin.
- Domain: -180.0 <= longitude_of_prime_meridian < 180.0 decimal degrees.
- Default = 0.0
-
-
-
longitude_of_projection_origin
- N
The longitude chosen as the origin of rectangular coordinates for a map projection.
@@ -678,25 +554,10 @@
north_pole_grid_longitude
- N
Longitude (degrees) of the true north pole in the rotated grid.
-
-
- perspective_point_height
- N
-
- Records the height, in metres, of the map
- projection perspective point above the ellipsoid (or sphere). Used
- by perspective-type map projections, for example the Vertical
- Perspective Projection, which may be used to simulate the view from
- a Meteosat satellite.
-
-
-
scale_factor_at_central_meridian
- N
A multiplier for reducing a distance obtained from a map by
@@ -708,5 +569,4 @@
scale_factor_at_projection_origin
- N
A multiplier for reducing a distance obtained from
@@ -716,51 +576,11 @@
-
-
- semi_major_axis
- N
-
- Specifies the length, in metres, of the semi-major
- axis of the ellipsoidal figure associated with the geodetic datum and
- used to approximate the shape of the Earth. Commonly denoted using the
- symbol a. In the case of a spherical Earth
- approximation this attribute defines the radius of the Earth. See
- also the inverse_flattening attribute.
-
-
-
-
- semi_minor_axis
- N
-
- Specifies the length, in metres, of the semi-minor
- axis of the ellipsoidal figure associated with the geodetic datum and
- used to approximate the shape of the Earth. Commonly denoted using the
- symbol b. In the case of a spherical Earth
- approximation this attribute should be omitted (the preferred option)
- or else set equal to the value of the semi_major_axis attribute. See also the inverse_flattening attribute.
-
-
-
-
- standard_parallel
- N
-
- Specifies the line, or lines, of latitude at which the developable map
- projection surface (plane, cone, or cylinder) touches the reference
- sphere or ellipsoid used to represent the Earth. Since there is zero
- scale distortion along a standard parallel it is also referred to as
- a "latitude of true scale". In the situation where a conical
- developable surface intersects the reference ellipsoid there are two
- standard parallels, in which case this attribute can be used as a
- vector to record both latitude values, with the additional convention
- that the standard parallel nearest the pole (N or S) is provided first.
-
-
+
+ standard_parallel
+
Line of constant latitude at which the surface of the
Earth and plane or developable surface intersect.
This attribute may be vector valued if two standard
parallels are specified.
-
Domain: -90.0 <= standard_parallel <= 90.0
@@ -768,5 +588,4 @@
straight_vertical_longitude_from_pole
- N
The longitude to be oriented straight up from the North or South Pole.
@@ -775,6 +594,8 @@
-
+
+
+