Merge pull request #563 from JonathanGregory/issue537

Update link to CR-WKT mapping

appf.adoc

@@ -173,7 +173,7 @@ link:$$https://proj.org/operations/projections/cea.html$$[https://proj.org/opera
 and
 link:$$http://geotiff.maptools.org/proj_list/cylindrical_equal_area.html$$[http://geotiff.maptools.org/proj_list/cylindrical_equal_area.html]
 ("Lambert Cylindrical Equal Area" or EPSG 9834 or EPSG 9835).
-Detailed formulas can be found in <<bibliography.adoc#Snyder>> pages 76-85.
+Detailed formulas can be found in <<Snyder>> pages 76-85.
 
 === Latitude-Longitude
 
@@ -449,8 +449,9 @@ This attribute and **`geoid_name`** cannot both be specified.
 
 | **`horizontal_datum_name`** | S
 |  The name of the geodetic (horizontal) datum, which corresponds to the procedure used to measure positions on the surface of the Earth.
-Valid datum names and their associated parameters are given in https://github.com/cf-convention/cf-conventions/wiki/Mapping-from-CF-Grid-Mapping-Attributes-to-CRS-WKT-Elements (horiz_datum.csv, OGC_DATUM_NAME column) and are obtained by transforming the EPSG name using the following rules (used by OGR and Cadcorp): convert all non alphanumeric characters (including +) to underscores, then strip any leading, trailing or repeating underscores.
-This is to ensure that named datums can be correctly identified for precise datum transformations  (see https://github.com/cf-convention/cf-conventions/wiki/OGC-WKT-Coordinate-System-Issues for more details).
+Valid datum names and their associated parameters are given in **`horiz_datum.csv`** (OGC_DATUM_NAME column), following Table 2 in <<CF-WKT>>.
+The valid names are obtained by transforming the EPSG name using the following rules (used by OGR and Cadcorp): convert all non alphanumeric characters (including +) to underscores, then strip any leading, trailing or repeating underscores.
+This is to ensure that named datums can be correctly identified for precise datum transformations (see <<CF-WKT>> for more details).
 Corresponds to a OGC WKT DATUM node name.
 
 | **`inverse_flattening`** | N
@@ -501,7 +502,7 @@ Used by perspective-type map projections, for example the Vertical Perspective P
 
 | **`prime_meridian_name`** | S
 | The name of the prime meridian associated with the geodetic datum.
-Valid names are given in https://github.com/cf-convention/cf-conventions/wiki/Mapping-from-CF-Grid-Mapping-Attributes-to-CRS-WKT-Elements (prime_meridian.csv).
+Valid names are given in **`prime_meridian.csv`**, following Table 2 in <<CF-WKT>>.
 Corresponds to a OGC WKT PRIMEM node name.
 
 |**`projected_crs_name`** | S
@@ -510,7 +511,7 @@ Corresponds to a OGC WKT PROJCS node name.
 
 | **`reference_ellipsoid_name`** | S
 | The name of the reference ellipsoid.
-Valid names are given in https://github.com/cf-convention/cf-conventions/wiki/Mapping-from-CF-Grid-Mapping-Attributes-to-CRS-WKT-Elements (ellipsoid.csv).
+Valid names are given in **`ellipsoid.csv`**, following Table 2 in <<CF-WKT>>.
 Corresponds to a OGC WKT SPHEROID node name.
 
 | **`scale_factor_at_central_meridian`** | N

bibliography.adoc

@@ -4,6 +4,7 @@
 === References
 
 - [[[CFDM]]]  link:$$https://doi.org/10.5194/gmd-10-4619-2017$$[A data model of the Climate and Forecast metadata conventions (CF-1.6) with a software implementation (cf-python v2.1)]. Hassell, D., Gregory, J., Blower, J., Lawrence, B. N., and Taylor, K. E.: _Geosci. Model Dev._, 10, 4619-4646, 2017.
+- [[[CF-WKT]]]  link:$$https://cfconventions.org/wkt-proj-4.html$$[Mapping from CF Grid Mapping Attributes to CRS WKT Elements].
 - [[[COARDS]]]  link:$$https://ferret.pmel.noaa.gov/Ferret/documentation/coards-netcdf-conventions$$[Conventions for the standardization of NetCDF Files].
 Sponsored by the "Cooperative Ocean/Atmosphere Research Data Service," a NOAA/university cooperative for the sharing and distribution of global atmospheric and oceanographic research data sets. May 1995.
 - [[[DCG19]]]  link:$$https://doi.org/10.5194/gmd-12-4099-2019$$[Evaluation of lossless and lossy algorithms for the compression of scientific datasets in netCDF-4 or HDF5 files]. Delaunay, X., A. Courtois, and F. Gouillon: _Geosci. Model Dev._, 12, 4099-4113, 2019.