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#107: CF Data Model 1.7
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Reporter: markh | Owner: cf-conventions@…
Type: task | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
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Comment (by jonathan):
Dear Jim
Both `grid_mapping` and `formula_terms` can be described logically by the
[http://kitt.llnl.gov/trac/ticket/107?replyto=55#comment:55 text which
David posted]. For instance,
* a vertical georeference construct might apply to an atmosphere hybrid
height coordinate, in which case it would contain the `a` (dimensions of
height) and `b` (dimensionless) auxiliary coordinate constructs, a field
of surface height above the geoid, the auxiliary coordinate construct of
height above the geoid (if it exists in the dataset), and optionally the
name of the geoid (if we permit this extension). Its purpose is to relate
the `a` and `b`, which by themselves do not geolocate the data, to the
height above the geoid, which is a geophysically defined surface whose
precise realisation might be specified as well.
* a horizontal georeference construct might apply to a rotated latitude-
longitude coordinate system, in which case it would contain the rotated
latitude and longitude coordinate constructs, the (unrotated,
geographical) latitude and longitude of the rotated pole, the auxiliary
coordinate constructs of latitude and longitude, and optionally the
definition of the reference ellipsoid. Its purpose is to relate the
rotated latitude and longitude, which by themselves do not geolocate the
data, to geographical latitude and longitude, which do geolocate the data,
optionally with the ellipsoid to make their definition more precise.
What is to be gained in clarity or simplicity by regarding these two
things as distinct concepts? We don't talk about transforms or coordinate
reference systems because these terms have technical and sometimes
restrictive meanings, and therefore may make the description less clear.
Best wishes
Jonathan
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Ticket URL: <http://kitt.llnl.gov/trac/ticket/107#comment:79>
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