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Add provenance information about BIOS ancillaries #406

Open ccarouge opened 6 days ago

ccarouge commented 6 days ago

Add information to the global attributes of the gridinfo and add variable attributes were needed.

SeanBryan51 commented 6 days ago

Currently the appended BIOS ancillary variables in the BIOS gridinfo don't contain attributes that are particularly helpful, for example:

float rhosoil(latitude, longitude) ;
        rhosoil:long_name = "GDAL Band Number 1" ;
        rhosoil:_FillValue = -9999.f ;
        rhosoil:grid_mapping = "crs" ;

We should at least add a suitable long_name and units attribute for the BIOS ancillary variables.

SeanBryan51 commented 6 days ago

@har917 what information do you want to convey in the global attributes in the BIOS gridinfo with regards to provenance? I can add these to the regridding script used for generating the BIOS gridinfo file.

Also if you have knowledge of the relevant units and/or long_name for the BIOS ancillary variables I can add these as well

har917 commented 5 days ago

@SeanBryan51

Information to go in the global attributes (may need fine editing)

The units [in ()] and long name should follow the existing information in the gridinfo - however if that's not available then we can include

SeanBryan51 commented 5 days ago

Here are the attributes in the original gridinfo file (gridinfo_CSIRO_CRU05x05_4tiles.nc) for the appended BIOS variables:

BIOS Variable long_name units
silt UM soil texture - silt fraction unknow
clay UM soil texture - clay fraction unknow
sand UM soil texture - sand fraction unknow
css Soi specific heat capacity J/kg/K
sfc VOL SMC AT CRIT PT unknow
rhosoil SOIL BULK DENSITY kg/m^3
bch CLAPP-HORNBERGER B COEFFICIENT unknow
hyds SAT SOIL CONDUCTIVITY m/s
ssat VOL SMC AT SATURATOIN unknow
swilt VOL SMC AT WILTING unknow
sucs SATURATED SOIL WATER SUCTION m
mvg
c4frac
modis_igbp
avgannmax_fapar

Let me know if you are happy (or unhappy) with these attributes. Note: you did not specify attributes for the sand and css variables- let me know if these attributes should change.

I will also need the attributes for variables mvg, c4frac, modis_igbp and avgannmax_fapar as these were not in the original gridinfo file.

har917 commented 5 days ago

@SeanBryan51 Some points - the sand layer is not used (by any configuration of CABLE as far as I know) since this is evaluated from the silt and clay variables. So there is a question as to whether it should be in there or not.

The silt, clay and sand variables are dimensionless (not unknown) - in effect they are fractions.

The units of the sfc, ssat and swilt variables are 'm^3 water / m^3 soil' - I would expand 'VOL SMC' to 'volumetric soil moisture content.

Apologies - yes the dimensions for css are correct. Minor typos in that it's 'soil specific heat capacity' and `VOL SMC AT SATURATION'

I will need to dig out additional information for the other variables (including sources). Long name and units are mvg: NVIS major vegetation group (categorical) c4frac: fractional cover of C4 grass (dimensionless) modis_igbp: IGBP biome (categorical) avgannmax_fapar: average-annual maximum value for FAPAR (dimensionless)

SeanBryan51 commented 5 days ago

@har97 here are the proposed changes to BIOS variable attributes:

BIOS Variable long_name (before) long_name (after) units (before) units (after)
silt UM soil texture - silt fraction Silt fraction of soil matrix unknow 1
clay UM soil texture - clay fraction Clay fraction of soil matrix unknow 1
sand UM soil texture - sand fraction Sand fraction of soil matrix unknow 1
css Soi specific heat capacity Soil specific heat capacity J/kg/K Unchanged
sfc VOL SMC AT CRIT PT Volumetric soil moisture content at critical point unknow m3 m-3
rhosoil SOIL BULK DENSITY Soil bulk density kg/m^3 Unchanged
bch CLAPP-HORNBERGER B COEFFICIENT Clapp-Hornberger b coefficient unknow 1
hyds SAT SOIL CONDUCTIVITY Hydraulic conductivity of soil at saturation m/s Unchanged
ssat VOL SMC AT SATURATOIN Volumetric soil moisture content at saturation unknow 1
swilt VOL SMC AT WILTING Volumetric soil moisture content at wilting unknow 1
sucs SATURATED SOIL WATER SUCTION Soil suction at saturation m Unchanged
mvg NVIS major vegetation group
c4frac Fractional cover of C4 grass 1
modis_igbp IGBP biome
avgannmax_fapar Average-annual maximum value for FAPAR 1

Some reasons/proposals regarding the above changes:

  1. Remove "UM soil texture" for silt, clay and sand variables as the UM is not relevant in the context of BIOS ancillaries.
  2. Keep sand variable for now for backwards compatibility.
  3. Expand acronyms and be verbose in long name description where possible for clarity.
  4. Set units to be 1 for dimensionless variables as per the cf-conventions.
  5. Categorical data such as mvg, and modis_igbp can be self describing using the flags_* attributes (see cf-conventions#flags). Is this of interest?
AlisonBennett commented 5 days ago

Great to see units going into the variable attributes!

Is it possible to also add the version numbers to the NVIS and MODIS vegetation classifications? I'm not sure what they are, but @har917 may.

From: Sean Bryan @.> Sent: Wednesday, 25 September 2024 14:50 To: CABLE-LSM/CABLE @.> Cc: Subscribed @.***> Subject: Re: [CABLE-LSM/CABLE] Add provenance information about BIOS ancillaries (Issue #406)

@har97https://github.com/har97 here are the proposed changes to BIOS variable attributes:

BIOS Variable long_name (before) long_name (after) units (before) units (after) silt UM soil texture - silt fraction Silt fraction of soil matrix unknow 1 clay UM soil texture - clay fraction Clay fraction of soil matrix unknow 1 sand UM soil texture - sand fraction Sand fraction of soil matrix unknow 1 css Soi specific heat capacity Soil specific heat capacity J/kg/K Unchanged sfc VOL SMC AT CRIT PT Volumetric soil moisture content at critical point unknow m3 m-3 rhosoil SOIL BULK DENSITY Soil bulk density kg/m^3 Unchanged bch CLAPP-HORNBERGER B COEFFICIENT Clapp-Hornberger b coefficient unknow 1 hyds SAT SOIL CONDUCTIVITY Hydraulic conductivity of soil at saturation m/s Unchanged ssat VOL SMC AT SATURATOIN Volumetric soil moisture content at saturation unknow 1 swilt VOL SMC AT WILTING Volumetric soil moisture content at wilting unknow 1 sucs SATURATED SOIL WATER SUCTION Soil suction at saturation m Unchanged mvg NVIS major vegetation group c4frac Fractional cover of C4 grass 1 modis_igbp IGBP biome avgannmax_fapar Average-annual maximum value for FAPAR 1

Some reasons/proposals regarding the above changes:

  1. Remove "UM soil texture" for silt, clay and sand variables as the UM is not relevant in the context of BIOS ancillaries.
  2. Keep sand variable for now for backwards compatibility.
  3. Expand acronyms and be verbose in long name description where possible for clarity.
  4. Set units to be 1 for dimensionless variables as per the cf-conventionshttps://cfconventions.org/cf-conventions/cf-conventions.html#units.
  5. Categorical data such as mvg, and modisigbp can be self describing using the flags* attributes (see cf-conventions#flagshttps://cfconventions.org/cf-conventions/cf-conventions.html#flags). Is this of interest?

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