John,
But ancillary variables aren't coordinates, are they?
Jim
On 12/21/15 1:08 PM, John Caron wrote:
i think a crucial property of coordinates is that their dimensions are
a subset of the variable's dimensions. otherwise one cant assign the
correct coordinate.
the length of a char valued coordinate is an exception, really char(n)
is logically the same as string.
while a dim=1 coordinate could be used, it would violate that simple
principle for no obvious gain. scalar here is preffered i think.
we added some language to CF recently to clarify this. not sure where
it is.
john
On Mon, Dec 21, 2015 at 8:49 AM, Jim Biard <jbi...@cicsnc.org
<mailto:jbi...@cicsnc.org>> wrote:
David,
I've not come across this particular case, but I've had cases
where the ancillary data that I wish to store has less dimensions
than the corresponding parent field. The Conventions seem to
require that the dimensions all match. I'm of the opinion that it
should not be so restrictive.
In your particular instance, what is the significance of your time
variable?
Grace and peace,
Jim
On 12/21/15 10:41 AM, David Hassell wrote:
Hello,
I was wondering if anyone has ever had use for an ancillary variable
(or data variable pointed to from a formula_terms attribute), having a
size 1 dimension which the "parent" field does *not* have. The
convention do not say anything about this.
For example:
dimensions:
t = 1;
x = 96;
y = 73;
variables:
float q(x, y) ;
q:standard_name = "specific_humidity" ;
q:units = "g/g" ;
q:ancillary_variables = "q_error_limit" ;
float q_error_limit(t, x, y)
q_error_limit:standard_name = "specific_humidity standard_error" ;
q_error_limit:units = "g/g" ;
Similary for a scalar coordinate variable, which is logically
equivalent to the size 1 dimension case (this time shown on a formula
terms variable):
dimensions:
x = 96;
y = 73;
z = 19;
variables:
float q(z, x, y) ;
q:standard_name = "specific_humidity" ;
q:units = "g/g" ;
float z(z):
z:standard_name = "atmosphere_hybrid_height_coordinate";
z.formula_terms = "a: var1 b: var2 orog: var3"
float var3(x, y):
time:coordinates = "time";
float time:
time:standard_name = "time";
time:units = "days since 2000-12-1";
Thanks for your help,
All the best,
David
--
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National Centre for Atmospheric Science (NCAS)
Department of Meteorology, University of Reading,
Earley Gate, PO Box 243,
Reading RG6 6BB, U.K.
Tel : +44 118 3785613
E-mail:d.c.hass...@reading.ac.uk <mailto:d.c.hass...@reading.ac.uk>
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