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Existing soil dataset
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1. FAO-UNESCO dataset. FAO-UNESCO Digital Soil Map of the World, 2007
http://icdc.cen.uni-hamburg.de/1/daten/land/soilmap.html

2. Harmonized World Soil Database. FAO/IIASA/ISRIC/ISSCAS/JRC, 2012. Harmonized World Soil Database (version 1.2). FAO, Rome, Italy and IIASA, Laxenburg, Austria.
http://www.fao.org/soils-portal/soil-survey/soil-maps-and-databases/harmonized-world-soil-database-v12/en/

3. A Chinese data set of soil properties released by Beijing Normal University (hereafter as BNU)
http://globalchange.bnu.edu.cn/research/soil2

4. SoilGrid1km
ftp://ftp.soilgrids.org/data/aggregated/1km/

5. SoilGrid250m
https://www.soilgrids.org/#!/?layer=TAXNWRB_250m&vector=1

6. A global data set of soil hydraulic properties and sub-grid variability of soil water retention and hydraulic conductivity curves.
https://doi.org/10.1594/PANGAEA.870605

7. WoSIS: Serving standardised soil profile data for the world
https://doi.org/10.17027/isric-wdcsoils.20160003