Accessing WoSIS-derived datasets

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Standardised datasets derived from WoSIS are distributed using two formats. The most recent, latest (dynamic) version can be  accessed through an OGC-compliant WFS (Web Feature Service).  Further, snapshot (static) dataset in TXT format are provided for consistent citation purposes.

  

Dataset versions

  • Snapshot (static) dataset: These are a representation of the complement of standardised data available at a given moment (e.g. July 2016). Each snapshot is given a unique name and digital object identifier (doi) for consistent citation purposes.
    So far, one snapshot has been released. The file can be downloaded here; methodological details are provided in a paper in Earth System Data Journal.
    WFS link for your GIS application: http://data.isric.org/geoserver/wosis_snapshot/wfs

  • Latest (dynamic) dataset: This dataset contains the most recent complement of standardised soil data served from WoSIS. Being dynamic, the dataset will grow once new point data are standardised, additional soil properties are considered, and/or when possible corrections are required.
    The latest dataset is served through an OGC-compliant WFS (Web Feature Service).
    WFS link for your GIS application: http://data.isric.org/geoserver/wosis_latest/wfs

More information on how the point data can be accessed from GIS or R using WFS, is described in this tutorial.

File naming conventions and descriptions as used for the dynamic WoSIS-WFS dataset.

Property 

 Description

bulk_density_fine_earth 

Bulk density of the fine earth fraction < 2 mm (kg/dm3)

bulk_density_whole_soil 

Bulk density of the whole soil including coarse fragments (kg/dm3)

calcium_carbonate_equivalent_total 

The content of carbonate in a liming material or calcareous soil calculated as if all of the carbonate is in the form of CaCO3 (g/kg in the fine earth fraction < 2 mm); also known as inorganic carbon

organic_carbon

Gravimetric content of organic carbon in the fine earth fraction <2 mm (g/kg)

total_carbon 

Gravimetric content of organic carbon and inorganic carbon in the fine earth fraction < 2 mm (g/kg)

cation_exchange_capacity 

Capacity of the fine earth fraction < 2 mm to hold exchangeable cations, estimated by buffering the soil at specified pH (e.g. pH7 or pH8; cmolc/kg)

effective_cation_exchange_capacity 

Capacity of the fine earth fraction < 2 mm to hold exchangeable cations at the pH of the soil (ECEC, cmolc/kg). Conventionally approximated by summation of exchangeable bases (Ca2+, Mg2+, K+, and Na+) plus 1 N KCl exchangeable acidity (Al3+ and H+) in acidic soils 

electrical_conductivity

Ability of a 1:x soil water extract to conduct electrical current (ECx, mS/m);  ECe  refers to values measured in a saturated soil extract

coarse_fragments_gravimetric_total 

Gravimetric content of coarse fragments > 2 mm in the whole soil (g/100g)

coarse_fragments_volumetric_total 

Volumetric content of the coarse fragments > 2 mm in the whole soil (cm3/100cm3)

clay_total 

Gravimetric content of < 0.002 mm soil material in the fine earth fraction < 2 mm (g/100g) 

silt_total 

0.002 mm to Y mm fraction of the <  2 mm soil material (g/100g); esd (equivalent spherical diameter), X resp. Y as specified in the analytical method descriptions

sand_total

Larger than Y mm fraction of the < 2 mm soil material (g/100g); esd (equivalent spherical diameter), Y as specified in the analytical method descriptions

water_retention_gravimetric 

Soil moisture content by weight, at the tension specified in the analytical method descriptions (g/100g)

water_retention_volumetric 

Soil moisture content by volume, at the tension specified in the analytical method descriptions (cm3/100cm3)

ph_cacl2 

A measure of the acidity or alkalinity in soils, defined as the negative logarithm (base 10) of the activity of hydronium ions (H+) in a CaCl2 solution, as specified in the analytical method descriptions

ph_h2o 

A measure of the acidity or alkalinity in soils, defined as the negative logarithm (base 10) of the activity of hydronium ions (H+) in water

ph_kcl 

A measure of the acidity or alkalinity in soils, defined as the negative logarithm (base 10) of the activity of hydronium ions (H+) in a KCl solution, as specified in the analytical method descriptions

ph_naf 

A measure of the acidity or alkalinity in soils, defined as the negative logarithm (base 10) of the activity of hydronium ions (H+) in a NaF solution, as specified in the analytical method descriptions

soil_classification_WRB

Classification of the soil profile according to specified edition (year) of the World Reference Base for Soil Resources (WRB), up to qualifier level when available

soil_classification_FAO

Classification of the soil profile according to specified edition (year) of the FAO-Unesco Legend, up to soil unit level when available

soil_classification_Soil_Taxonomy

Classification of the soil profile according to specified edition (year) of USDA Soil Taxonomy, up to subgroup level when available

 

 

Technical documentation

  1. Ribeiro E, Batjes NH, Leenaars JGB, Van Oostrum AJM and Mendes de Jesus J 2015.Towards the standardization and harmonization of world soil data: Procedures Manual ISRIC World Soil Information Service (WoSIS version 2.0). ISRIC - World Soil Information, Wageningen, 110 p. (PDF)

  2. Batjes NH, Ribeiro E, van Oostrum A, Leenaars J, Hengl T, and Mendes de Jesus J 2017: WoSIS - Providing standardised soil profile data for the world, Earth System Science Data 9, 1-14  (PDF).

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