#164: Simple Geometries in CF
-----------------------------+------------------------------
Reporter: whiteaker | Owner: cf-conventions@…
Type: enhancement | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords: geometry
-----------------------------+------------------------------
Comment (by davidhassell):
Hello,
I am wondering about how `node_coordinates` and `coordinates` can be
correctly paired. For example in this case:
{{{
float geometry_container ;
geometry_container:geometry_type = "polygon" ;
geometry_container:node_count = "node_count" ;
geometry_container:node_coordinates = "x y" ;
geometry_container:coordinates = "lat lon"
}}}
how do we know which of `x` and `y` goes with `lat`? The answer is, of
course, that the netCDF variables `x`, `y`, `lat` and `lon` must have
sufficient metadata, but I'm can't see that this is specified in the text.
The proposed text already says **The geometry node coordinate variables
must each have an axis attribute whose allowable values are X, Y, and Z**.
Can we also say that if `coordinates` are provided then those which
correspond to `node_coordinates` **must** also have the axis attribute? In
this way, there will be no ambiguity.
All the best,
David
--
Ticket URL: <https://cf-trac.llnl.gov/trac/ticket/164#comment:10>
CF Metadata <http://cf-convention.github.io/>
CF Metadata
