Example 6 : Climatological Mean

An example of one tile with a climatology time axis from the global ocean domain available in https://github.com/gaelforget/nctiles-testcases

using NCTiles
import NCTiles: NCDatasets, Dates

File Paths

inputs=NCTiles.NCTILES_TESTCASES
NCTiles.ensure_testcases_installed()

outputs = joinpath(tempdir(),"NCTILES_TESTCASES_OUTPUT/")
if ~ispath(outputs); mkpath(outputs); end

savedir = joinpath(outputs,"ex6")
if ~ispath(savedir); mkpath(savedir); end

field_name = "FeT"

README = ["File created by","example 1 of NCTiles.jl","on "*string(Dates.now())]

3-element Vector{String}:
 "File created by"
 "example 1 of NCTiles.jl"
 "on 2024-05-04T18:20:19.323"

One tile example

ncvars,ncdims,fileatts = readncfile(joinpath(inputs,"diags_nctiles/FeT.0062.nc"))
rm(joinpath(savedir,"ex6a.nc"),force=true)
write(ncvars,joinpath(savedir,"ex6a.nc"),README=README)

closed Dataset

Define Dimensions

For reference:

- i_c: NCvar("i_c", "1", 30, 1.0:30.0, Dict("units" => "1","long_name" => "Cartesian coordinate 1"), NCDatasets)
- j_c: NCvar("j_c", "1", 30, 1.0:30.0, Dict("units" => "1","long_name" => "Cartesian coordinate 2"), NCDatasets)
- k_c: NCvar("k_c", "1", 50, 1.0:50.0, Dict("units" => "1","long_name" => "Cartesian coordinate 3"), NCDatasets)
- t:   NCvar("t", "1", 12, 1.0:12.0, Dict("units" => "1","long_name" => "Time coordinate"), NCDatasets)
- tcb:  NCvar("tcb", "", 2, Any[], Dict{Any,Any}(), NCDatasets)

Note : tcb is unitles, only has a dimension, no values

FeT_dims = [ncdims["i_c"],
                ncdims["j_c"],
                ncdims["k_c"],
                ncdims["t"]]
clim_dims = [ncdims["tcb"],
                ncdims["t"]]

2-element Vector{NCvar}:
 NCvar("tcb", "", 2, Any[], Dict{Any, Any}(), NCDatasets)
 NCvar("t", "1", 12, [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0], Dict("units" => "1", "long_name" => "Time coordinate"), NCDatasets)

Define Variables

Note : lat, lon, dep, tim, thic, area, land defined same as non-climatology example

FeT = NCvar("FeT", # name
                "mmol Fe", # units
                FeT_dims, # dimensions
                NCData(joinpath(inputs,"diags_nctiles/FeT.0062.nc"), "FeT", NCDatasets, Float32), # values- to be read from file
                Dict("coordinates" => "lon lat dep tim","long_name" => "FeT concentration"), # attributes
                NCDatasets) # backend

climatology_bounds = NCvar("climatology_bounds", # name
                                "days since 1992-1-1 0:0:0", # units
                                clim_dims, # dimensions
                                NCData(joinpath(inputs,"diags_nctiles/FeT.0062.nc"), "climatology_bounds", NCDatasets, Float32), # values- to be read from file
                                Dict("long_name" => "climatology_bounds"), # attributes
                                ncvars["climatology_bounds"].backend) # backend

NCvar("climatology_bounds", "days since 1992-1-1 0:0:0", NCvar[NCvar("tcb", "", 2, Any[], Dict{Any, Any}(), NCDatasets), NCvar("t", "1", 12, [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0], Dict("units" => "1", "long_name" => "Time coordinate"), NCDatasets)], NCData("/home/runner/.julia/artifacts/4c36bdda8c1f8388b7f6de8da17d965dab33431e/nctiles-testcases-0.1/diags_nctiles/FeT.0062.nc", "climatology_bounds", NCDatasets, Float32), Dict("long_name" => "climatology_bounds"), NCDatasets)

Write to file

writevars = Dict(["FeT" => FeT,
                "lon" => ncvars["lon"],
                "lat" => ncvars["lat"],
                "dep" => ncvars["dep"],
                "tim" => ncvars["tim"],
                "thic" => ncvars["thic"],
                "area" => ncvars["area"],
                "land" => ncvars["land"],
                "climatology_bounds" => climatology_bounds])
rm(joinpath(savedir,"ex6b.nc"),force=true)
write(writevars,joinpath(savedir,"ex6b.nc"),README=README)

closed Dataset

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