redefine texture fractions

bkempen commented 8 months ago

The various SandSizeFractions, SiltSizeFractions and ClaySizeFractions (https://vocab.isric.org/glosis_cl/en/) are not really usable since fraction size is not specified (e.g. https://vocab.isric.org/glosis_cl/en/page/sandPropertyCode-SSF1).

The particle size distribution of each fraction should ideally be defined explicitly (for instance based on two/three most commonly used particle size distributions used in soil science). E.g. SandFraction_0.25-0.5mm, SandFraction_0.5-2mm, SiltFraction_0.002-0.02mm, SiltFraction_0.02-0.05mm, SiltFraction_0.02-0.063mm, etc. This would make these entries much more usable. Fractions of various classifications can be considered (e.g. ISO, USDA)

Consider removing current definitions (e.g. SandFraction01...SandFraction09) from the vocab. These come from a previous soil data standardization project at ISRIC defined in a way that the user can specify the particle size for each fraction. As such these are not useful to incorporate in a general vocabulary. In that case, particle size distribution should be explicitly defined.

(relates to #113)

ldesousa commented 6 months ago

These properties were directly derived from the Tier 1 / Tier 2 document submitted by ISRIC to INSII/GSP. I am happy to remove them, but keep in mind they are also present in the GloSIS domain model (UML models and report produced for FAO/GSP in 2019).

There is a code-list for texture Procedures that is referenced in the observations linked to the properties glosis_cl:physioChemicalPropertyCode-Textclay, glosis_cl:physioChemicalPropertyCode-Textsilt, glosis_cl:physioChemicalPropertyCode-Textsand. This code-list does not feature yet in the ISRIC vocab.

ldesousa commented 6 months ago

@bkempen In addition I will also remove these Properties:

SiltWaterDispersibleFraction01
SiltWaterDispersibleFraction02
SandWaterDispersible01
SandWaterDispersible02
SandWaterDispersible03
SandWaterDispersible04
SandWaterDispersible05

bkempen commented 6 months ago

@ldesousa I would wait with removing until alternatives are added. These should be texture fractions with indicated particle size range. Starting, for instance, with texture fractions as defined by ISO 14688-1:2017 and the USDA and WRB classifications (see tables above). I cannot oversee the consequences for the GLOSIS domain model, perhaps that one should be updated accordingly??

ldesousa commented 6 months ago

@ldesousa I would wait with removing until alternatives are added. These should be texture fractions with indicated particle size range. Starting, for instance, with texture fractions as defined by ISO 14688-1:2017 and the USDA and WRB classifications (see tables above). I cannot oversee the consequences for the GLOSIS domain model, perhaps that one should be updated accordingly??

I see what you mean now. These are not properties, but rather values for the observations glosis_lh:Sand, glosis_lh:Silt and glosis_lh_Clay. However those are supposed to have numerical results instead. This is going to take some work to disentangle.

Envisioned tasks:

Confirm the existence of just three properties (Sand, Silt and Clay) and add them to the Physio-Chemical concept scheme.
Correct current observations, limiting result to numerical.
Create new observations: a. SandClass b. SiltClass c. ClayClass
Create new values code-lists: a. SandClassValueCode b. SiltClassValueCode c. ClayClassValueCode

ldesousa commented 6 months ago

The numerical properties are already in the Physio-Chemical concept scheme.

PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX glosis_cl: <http://w3id.org/glosis/model/codelists/>

SELECT DISTINCT ?prop ?label
WHERE {
    ?prop a glosis_cl:PhysioChemicalPropertyCode ;
               skos:prefLabel ?label .
    FILTER REGEX(?label, "fraction")
}

prop	label
http://w3id.org/glosis/model/codelists/physioChemicalPropertyCode-Textclay	"Clay texture fraction"@en
http://w3id.org/glosis/model/codelists/physioChemicalPropertyCode-Textsand	"Sand texture fraction"@en
http://w3id.org/glosis/model/codelists/physioChemicalPropertyCode-Textsilt	"Silt texture fraction"@en
http://w3id.org/glosis/model/codelists/physioChemicalPropertyCode-Calfra	"Calcium carbonate equivalent - fraction"@en

bkempen commented 5 months ago

Sand-silt boundary should be 63 instead of 64 in the procedures list:

https://glosis-ld.github.io/glosis/glosis_procedure/index-en.html#/TextureProcedure

ldesousa commented 3 months ago

@bkempen Can you please have a look at the table below? It gathers all the Texture procedures from the AfSP data. Two questions:

Do they all apply to the fractions identified in the top of this issue?
Are the disp and nodisp items really necessary? Or can be removed?

Label	Description
adj100	fractions adjusted to sum up to 100%
disp	with appropriate dispersion
disp-beaker	with appropriate dispersion-beaker
disp-hydrometer	with appropriate dispersion-hydrometer
disp-hydrometer-bouy	with appropriate dispersion-hydrometer-Bouyoucos
disp-laser	with appropriate dispersion-laser
disp-pipette	with appropriate dispersion-pipette
disp-spec	with appropriate dispersion-spectrally measured and convertd to sand, silt or clay
fld	field estimate
nodisp	no dispersion
nodisp-hydrometer	no dispersion-hydrometer
nodisp-hydrometer-bouy	dispersion-hydrometer-Bouyoucos
nodisp-laser	no dispersion-laser
nodisp-pipett	no dispersion-pipette
nodisp-spec	no dispersion-spectrally measured and converted to sand, silt or clay