Index: /cf-conventions/branches/devel/docbooksrc/introduction.xml =================================================================== --- /cf-conventions/branches/devel/docbooksrc/introduction.xml (revision 7) +++ /cf-conventions/branches/devel/docbooksrc/introduction.xml (revision 45) @@ -1,3 +1,3 @@ - + Preface @@ -20,8 +20,12 @@ - This document will updated as required to correct mistakes - or add new material required for completeness or clarity. + This document will be updated +as required to correct mistakes or add new material required for completeness or clarity. +to reflect agreed changes to the standard and to correct mistakes according to the rules of CF governance. See for the full revision history. - Changes in the document use the following + Changes +in the document +with provisional status + use the following mark-up style: new text, deleted text, and @@ -291,5 +295,7 @@ We recommend that the NUG defined attribute Conventions - be given the string value "CF-1.0" + be given the string value + "CF-1.0" + "CF-1.1" to identify datasets that conform to these conventions. Index: /cf-conventions/branches/devel/docbooksrc/netcdf-files-and-components.xml =================================================================== --- /cf-conventions/branches/devel/docbooksrc/netcdf-files-and-components.xml (revision 1) +++ /cf-conventions/branches/devel/docbooksrc/netcdf-files-and-components.xml (revision 45) @@ -326,5 +326,8 @@ attribute Conventions - to the string value "CF-1.0". The string is interpreted as a + to the string value + "CF-1.0" + "CF-1.1" + . The string is interpreted as a directory name relative to a directory that is a repository of documents Index: /cf-conventions/branches/devel/docbooksrc/coordinate-types.xml =================================================================== --- /cf-conventions/branches/devel/docbooksrc/coordinate-types.xml (revision 20) +++ /cf-conventions/branches/devel/docbooksrc/coordinate-types.xml (revision 45) @@ -36,8 +36,16 @@ that the axis attribute be attached to these coordinates and given one of the values X, - Y or Z. We attach no + Y or Z. +We attach no specific meaning to the axis values in this case, but note that they may provide a useful hint to an application that - plots spatially oriented data. We strongly recommend that coordinate + plots spatially oriented data. +The values X and Y + for the axis attribute should be used to identify horizontal coordinate + variables. If both X- and Y-axis are identified, X-Y-up + should define a right-handed coordinate system, i.e. rotation from the + positive X direction to the positive Y direction is anticlockwise if + viewed from above. + We strongly recommend that coordinate variables be used for all coordinate types whenever they are applicable. @@ -95,8 +103,9 @@ or equivalents, because applications which use the units to identify axes would have no means of distinguishing such an axis from real - latitude, and might draw incorrect coastlines, for instance. It would + latitude, and might draw incorrect coastlines, for instance. +It would also not generally be appropriate to attach an axis attribute to a rotated-latitude coordinate variable. Such a variable can be identified - by a standard_name of grid_latitude. + by a standard_name of grid_latitude. @@ -150,8 +159,9 @@ which use the units to identify axes would have no means of distinguishing such an axis from real longitude, and might draw - incorrect coastlines, for instance. It would also not generally be + incorrect coastlines, for instance. +It would also not generally be appropriate to attach an axis attribute to a rotated-longitude coordinate variable. Such a variable can be identified by a - standard_name of grid_longitude. + standard_name of grid_longitude. Index: /cf-conventions/branches/devel/docbooksrc/coordinate-systems.xml =================================================================== --- /cf-conventions/branches/devel/docbooksrc/coordinate-systems.xml (revision 44) +++ /cf-conventions/branches/devel/docbooksrc/coordinate-systems.xml (revision 45) @@ -54,5 +54,11 @@ is permissible, but optional, to list coordinate variables as well as auxiliary coordinate variables in the coordinates - attribute. + attribute. The axis attribute + is not allowed for auxiliary coordinate variables. Auxiliary coordinate + variables which lie on the horizontal surface can be identified as such + by their dimensions being horizontal, which can in turn be inferred from + their having an axis attribute of X or Y + , or from their units in the case of latitude and longitude + (see ). @@ -64,4 +70,7 @@ two-dimensional latitude and longitude variables that are identified via the coordinates attribute. +The use of the axis attribute with + values X and Y is recommended + for the coordinate variables(see ). @@ -133,7 +142,9 @@ T:coordinates = "lon lat" ; float xc(xc) ; + xc:axis = "X" ; xc:long_name = "x-coordinate in Cartesian system" ; xc:units = "m" ; float yc(yc) ; + yc:axis = "Y" ; yc:long_name = "y-coordinate in Cartesian system" ; yc:units = "m" ; @@ -349,5 +360,5 @@ T:units = "K" ; T:coordinates = "lon lat" ; - T:grid_mapping="rotated_pole" + T:grid_mapping = "rotated_pole" ; char rotated_pole rotated_pole:grid_mapping_name = "rotated_latitude_longitude" ; Index: /cf-conventions/branches/devel/docbooksrc/the-book-info.xml =================================================================== --- /cf-conventions/branches/devel/docbooksrc/the-book-info.xml (revision 7) +++ /cf-conventions/branches/devel/docbooksrc/the-book-info.xml (revision 45) @@ -1,5 +1,5 @@ NetCDF Climate and Forecast (CF) Metadata Conventions - Version 1.0, 28 October, 2003 + Version 1.1, 10 January, 2008 @@ -120,4 +120,17 @@ + + + 10 January 2008 + + + + : Changed text to refer to rules of CF governance, and provisional status. + , : Made changes regarding use of the axis attribute to identify horizontal coordinate variables. + Changed document version to 1.1. + + + +