Dear Randy I think the answer is Yes and No! Only a data variable can have cell_methods, but there is no prohibition on referring to a data variable as an aux coord var by pointing to it from the coordinates attribute of another data variable. So the air_pressure variable could be a data variable with an appropriate cell_methods attribute, which would take the form "PIXEL: median" where PIXEL is the name of some dimension which was collapsed to calculate the median. Maybe this dimension does not exist, though? In that case I think it might make sense to put "area: median". This would mean the median of all the values within the area of that cell.
Cheers Jonathan ----- Forwarded message from "[email protected]" <[email protected]> ----- > From: "[email protected]" <[email protected]> > To: [email protected] > Date: Thu, 27 Feb 2014 11:30:02 -0500 > Subject: [CF-metadata] can a cell method be an attribute of an auxiliary > coordinate variable ? > > > Dear All: > > i have a question .... > > We have a product containing an array of wind vectors (discrete sampling > geometry of type point) all derived from consecutive scenes of hyper > spectral imagery. > > One of the auxiliary coordinate variables is the air pressure. This air > pressure is the median value of the imagery pixels used to derive the wind > vector using a pattern recognition algorithm. > > There are no specific coordinates for the pixels that were used to derive > the wind vector, but it would be useful to identify that the air pressure > associated with the wind vector is a median value. > > Does it make sense to do the following in the specification of the air > pressure auxiliary coordinate variable ? > > float pressure (number_of_wind_vectors); > > standard_name = "air_pressure" > > cell_methods = "air_pressure: median" _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
