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Re: [ferret_users] How get NetCDF attribute values for mapping sst with Ferret
Hi Jacques,
The syntax you need is varname.attname so in your case:
LET sstmin = sea_surface_temperature.min
LET sstmax = sea_surface_temperature.max
shade/lev=(`sstmin`,`sstmax`,1) sea_surface_temperature
Putting values in grave-accents forces them to be evaluated as the
command is parsed, so the levels qualifier gets the numeric value of the
variables.
The documentation on access to netCDF attributes is in Chapter 3,
section 1 of the documentation. Scroll down or use browser search to
look for "access to attributes" in
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/VARIABLES
We're still working on a conversion of the documentation from an earlier
format - the internal links to index entries and so forth will work
better in the future!
Ansley
Jacques Stum wrote:
Hello Ferret users,
I'm a new Ferret user. I'm a little bit lost in the documentation. My
problem is the following :
I have a NetCdf variable (sea_surface_temperature) which has two
attributes:
sea_surface_temperature:min
sea_surface_temperature:max
which give the real physical min and max values of sst for my
particular file (e.g., min=275K, max=300K)
I would like to map my sst variable every 1K between these min and max
values :
shade/levels=(sea_surface_temperature:min,sea_surface_temperature:max,1)
"sea_surface_temperature"
My question is : how within my Ferret script do I get the values of
sea_surface_temperature:min and sea_surface_temperature:max, and how
do I specify the shade/levels instruction ?
Thank you for your help,
Jacques
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