[Paraview] Time Variables in CF Conventions

[Ken Sheldon]

It looks like the units in the CLASS data are, “hour since 1997-01-01 00:00:00”
In the test data, (which works fine, I confirm) , the units are, “days since 2001-1-1”

I would expect the attribute axis = ”T” to indicate this is a time dimension.  Time as a UOM might be used in any property, not just dimensions.
What do you think?


TIME1 (-1051845271)
    double,    182
    Number of attributes = 5
        units = hour since 1997-01-01 00:00:00
        time_origin = 1-JAN-1997 00:00:00
        axis = T
        standard_name = time
        bounds = TIME1_bnds



time (-781830246)
    double,    24
    Number of attributes = 7
        standard_name = time
        long_name = time
        units = days since 2001-1-1
        axis = T
        calendar = 360_day
        bounds = time_bnds
        original_units = seconds since 2001-1-1

From: Moreland, Kenneth [mailto:kmorel at sandia.gov]
Sent: Tuesday, April 26, 2016 1:14 PM
To: Ken Sheldon <KSheldon at slb.com>; paraview at paraview.org
Subject: Re: [Paraview] Time Variables in CF Conventions

The netCDF CF reader in ParaView does support time dimensions. For example, the netCDF file tos_O1_2001-2002.nc used for VTK testing (https://midas3.kitware.com/midas/item/206312<https://urldefense.proofpoint.com/v2/url?u=https-3A__midas3.kitware.com_midas_item_206312&d=CwMGaQ&c=uGuXJ43KPkPWEl2imVFDmZQlhQUET7pVRA2PDIOxgqw&r=PPcXhptMPNzBCwHx-o1zqg&m=A7bpyohhfVnNQoUi0GE2BJS2jE2OkxogntGvLqTmVGM&s=HGoAZZDUus7tmDI-abU30H7Ij8Qg_EeQwanbaawq2-w&e=>) has a time dimension and it loads just fine.

As I recall, the CF convention defines the time dimension using a units property on the variable that specifies some unit of time. One problem that has occurred in the past is that sometimes the time unit is something that the reader does not recognize as time. What is the time units used in your data set?

-Ken


From: ParaView <paraview-bounces at paraview.org<mailto:paraview-bounces at paraview.org>> on behalf of Ken Sheldon <KSheldon at slb.com<mailto:KSheldon at slb.com>>
Date: Saturday, April 23, 2016 at 9:51 AM
To: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] [Paraview] Time Variables in CF Conventions

I am trying to read a CF Conventions NetCDF file  (Sea Surface Temperature from NOAA).
The CF reader in ParaView recognizes the axes and the data correctly.  However, it does not seem to recognize the TIME dimension.

Is anyone here reading CF (Climate Forecasting) files successfully?


Reference: http://www.class.ngdc.noaa.gov/saa/products/search?datatype_family=SST14NA<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.class.ngdc.noaa.gov_saa_products_search-3Fdatatype-5Ffamily-3DSST14NA&d=CwMGaQ&c=uGuXJ43KPkPWEl2imVFDmZQlhQUET7pVRA2PDIOxgqw&r=PPcXhptMPNzBCwHx-o1zqg&m=A7bpyohhfVnNQoUi0GE2BJS2jE2OkxogntGvLqTmVGM&s=SRGkdReFFtTB-YX8wNBb3I5f3OaCiZ27AIVx3iqa78k&e=>

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