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  • cf-conventions/trunk/docbooksrc/coordinate-systems.xml

    r66 r48  
    5454    is permissible, but optional, to list coordinate variables as well as 
    5555    auxiliary coordinate variables in the <varname>coordinates</varname> 
    56     attribute. The <varname>axis</varname> attribute  
     56    attribute. <emphasis role="newtext">The <varname>axis</varname> attribute  
    5757    is not allowed for auxiliary coordinate variables. Auxiliary coordinate 
    5858    variables which lie on the horizontal surface can be identified as such 
    …… 
    6060    their having an axis attribute of <varname>X</varname> or <varname>Y</varname> 
    6161    , or from their units in the case of latitude and longitude  
    62     (see <xref linkend="coordinate-types"/>). 
     62    (see <xref linkend="coordinate-types"/>).</emphasis>   
    6363  </para> 
    6464  <para> 
    …… 
    7070    two-dimensional latitude and longitude variables that are identified 
    7171    via the <varname>coordinates</varname> attribute. 
    72     The use of the <varname>axis</varname> attribute with 
     72<emphasis role="newtext">The use of the <varname>axis</varname> attribute with 
    7373    values <varname>X</varname> and <varname>Y</varname> is recommended 
    74     for the coordinate variables(see <xref linkend="coordinate-types"/>). 
     74    for the coordinate variables(see <xref linkend="coordinate-types"/>).</emphasis> 
    7575  </para> 
    7676  <para> 
    …… 
    142142    T:coordinates = "lon lat" ; 
    143143  float xc(xc) ; 
    144     xc:axis = "X" ; 
     144<emphasis role="newtext">    xc:axis = "X" ;</emphasis> 
    145145    xc:long_name = "x-coordinate in Cartesian system" ; 
    146146    xc:units = "m" ; 
    147147  float yc(yc) ; 
    148     yc:axis = "Y" ; 
     148<emphasis role="newtext">    yc:axis = "Y" ;</emphasis> 
    149149    yc:long_name = "y-coordinate in Cartesian system" ; 
    150150    yc:units = "m" ; 
    …… 
    313313 
    314314  <section id="grid-mappings-and-projections"> 
    315     <title><emphasis role="deletedtext">Grid Mappings and Projections</emphasis><emphasis role="newtext">Horizontal Coordinate Reference Systems, Grid Mappings, and Projections</emphasis></title> 
     315    <title>Grid Mappings and Projections</title> 
    316316    <para> 
    317317      When the coordinate variables for a horizontal grid are not longitude 
    …… 
    338338      described in <xref linkend="appendix-grid-mappings"/>. 
    339339    </para> 
    340      
    341     <para> 
    342         <emphasis role="newtext">When the coordinate variables for a horizontal grid are longitude 
    343         and latitude, a grid mapping variable with <varname>grid_mapping_name</varname> 
    344         of <varname>latitude_longitude</varname> may be used to specify the  
    345         ellipsoid and prime meridian.</emphasis> 
    346     </para> 
    347      
    348340    <para> 
    349341        In order to make use of a grid mapping to directly calculate latitude 
    …… 
    406398    </para> 
    407399     
     400    <para> 
    408401    <example id="lambert-conformal-projection"> 
    409402      <title>Lambert conformal projection</title> 
    …… 
    459452     
    460453    </example> 
    461  
    462     <example id="latitude-and-longitude-on-a-spherical-earth"> 
    463       <title><emphasis role="newtext">Latitude and longitude on a spherical Earth</emphasis></title> 
    464       <programlisting> 
    465 <emphasis role="newtext">dimensions: 
    466   lat = 18 ; 
    467   lon = 36 ; 
    468 variables: 
    469   double lat(lat) ; 
    470   double lon(lon) ; 
    471   float temp(lat, lon) ; 
    472     temp:long_name = "temperature" ; 
    473     temp:units = "K" ; 
    474     temp:grid_mapping = "crs" ; 
    475   int crs ; 
    476     crs:grid_mapping_name = "latitude_longitude" 
    477     crs:semi_major_axis = 6371000.0 ; 
    478     crs:inverse_flattening = 0 ;</emphasis> 
    479       </programlisting> 
    480     </example> 
    481  
    482     <example id="latitude-and-longitude-on-the-wgs-1984-datum"> 
    483       <title><emphasis role="newtext">Latitude and longitude on the WGS 1984 datum</emphasis></title> 
    484       <programlisting> 
    485 <emphasis role="newtext">dimensions: 
    486   lat = 18 ; 
    487   lon = 36 ; 
    488 variables: 
    489   double lat(lat) ; 
    490   double lon(lon) ; 
    491   float temp(lat, lon) ; 
    492     temp:long_name = "temperature" ; 
    493     temp:units = "K" ; 
    494     temp:grid_mapping = "crs" ; 
    495   int crs ; 
    496     crs:grid_mapping_name = "latitude_longitude"; 
    497     crs:longitude_of_prime_meridian = 0.0 ; 
    498     crs:semi_major_axis = 6378137.0 ; 
    499     crs:inverse_flattening = 298.257223563 ;</emphasis> 
    500       </programlisting> 
    501     </example> 
    502  
    503     <example id="british-national-grid"> 
    504       <title><emphasis role="newtext">British National Grid</emphasis></title> 
    505       <programlisting> 
    506 <emphasis role="newtext">dimensions: 
    507   lat = 648 ; 
    508   lon = 648 ; 
    509   y = 18 ; 
    510   x = 36 ; 
    511 variables: 
    512   double x(x) ; 
    513     x:standard_name = "projection_x_coordinate" ; 
    514     x:units = "m" ; 
    515   double y(y) ; 
    516     y:standard_name = "projection_y_coordinate" ; 
    517     y:units = "m" ; 
    518   double lat(y, x) ; 
    519   double lon(y, x) ; 
    520   float temp(y, x) ; 
    521     temp:long_name = "temperature" ; 
    522     temp:units = "K" ; 
    523     temp:coordinates = "lat lon" ; 
    524     temp:grid_mapping = "crs" ; 
    525   int crs ; 
    526     crs:grid_mapping_name = "transverse_mercator"; 
    527     crs:semi_major_axis = 6377563.396 ; 
    528     crs:semi_minor_axis = 6356256.910 ; 
    529     crs:inverse_flattening = 299.3249646 ; 
    530     crs:latitude_of_projection_origin = 49.0 ; 
    531     crs:longitude_of_projection_origin = -2.0 ; 
    532     crs:false_easting = 400000.0 ; 
    533     crs:false_northing = -100000.0 ; 
    534     crs:scale_factor_at_projection_origin = 0.9996012717 ;</emphasis> 
    535       </programlisting> 
    536     </example> 
     454    </para> 
     455     
    537456  </section> 
    538457