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Update link to CR-WKT mapping #563

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Nov 28, 2024
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Update link to CR-WKT mapping #563

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Update link to CR-WKT mapping
JonathanGregory Nov 6, 2024
5be6da9
following revision of the cf/wkt page
JonathanGregory Nov 9, 2024
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8 changes: 4 additions & 4 deletions appf.adoc
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Expand Up @@ -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

Expand Down Expand Up @@ -449,7 +449,7 @@ 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.
Valid datum names and their associated parameters are given in <<CF-WKT>> (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).
Corresponds to a OGC WKT DATUM node name.

Expand Down Expand Up @@ -501,7 +501,7 @@ 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 <<CF-WKT>> (prime_meridian.csv).
Corresponds to a OGC WKT PRIMEM node name.

|**`projected_crs_name`** | S
Expand All @@ -510,7 +510,7 @@ 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 <<CF-WKT>> (ellipsoid.csv).
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I cannot find the file ellipsoid.csv in <<CF-WKT>>. THis one I was able to locate and download from somewhere about a year ago, but I do not remember the location (and I seem not to be able to retrace what I did).

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Thanks for pointing this out. Please see #537 for resolution.

Corresponds to a OGC WKT SPHEROID node name.

| **`scale_factor_at_central_meridian`** | N
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1 change: 1 addition & 0 deletions bibliography.adoc
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Expand Up @@ -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.
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