soilgrids 250m downloading site for the whole Africa and reason for the Nodata value in the Saharan

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girma...@gmail.com

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Nov 29, 2017, 5:39:25 AM11/29/17

to ISRIC - World Soil Information

Dear all

I am looking for downloading soilgrids 250m (clay, silt and sand content) f= or the whole of Africa. I found the ftp link ftp://ftp.soilgrids.org/data/A= F/recent/ But most of the data in the Saharan desert belongs to no data. However, the= single data that I downloaded from https://www.soilgrids.org/#!/?lon=3D-8=

.279560778566395&lat=3D19.698954983142173&zoom=3D3&layer=3DTAXNWRB_250m&sho=

wInfo=3D1

Site at least for sand content which I tried has some value (sand content = of 97%).

Could you please tell me how I can download the data from the correct site? Why the data in the Saharan Deseret has No data value ?

With kind regards

Girma

niels....@wur.nl

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Nov 29, 2017, 11:04:53 AM11/29/17

to ISRIC - World Soil Information

A) The latest version of SoilGrids250 for the world is available at: https://www.soilgrids.org.

One can download specific geographic subsets (e.g. for Africa) by specifying the lon-lat limits of a “bounding box” (via download button).

The above data are also accessible via our Soil Data Hub at:
http://data.isric.org/geonetwork/srv/eng/catalog.search;jsessionid=CA32D7C20D3B714A5D6A4B443352CC2A#/search?any=SoilGrids250m

Details are provided in: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169748. See also the remarks about the ‘land mask’.

B) The FTP site you are referring to is for an earlier 250m version for Africa only. This version used a different soil mask layer, i.e. “ all deserts and shifting sand areas were excluded” see http://dx.doi.org/10.1371/journal.pone.0125814).