Description Usage Arguments Value Note Author(s) See Also
Validate SoilGrid (spatial predictions) i.e. soil property maps following the GSIF validation protocol.
1 2 | SoilGrid.validator(obj, domain, ground.truth, N.sample=2000,
xml.file, z.lim, md.type="INSPIRE", test.URL=FALSE)
|
obj |
|
domain |
|
ground.truth |
|
N.sample |
integer; random sampling size |
xml.file |
character; metadata file (should have the same name as |
z.lim |
numeric; upper and lower physical limits |
md.type |
character; metadata standard (currently INSPIRE) |
test.URL |
logical; specifies whether to validate XML schema / test download times and proj4 string |
Returns a list with validation results. Explanation of codes is available in the SoilGrids.org data validation protocol.
One SoilGrid layer (2D slice) basically contains predictions on a regular grid for a specific soil depth (at either point or block support). The ground.truth
data must refer to the exactly the same depth and the same support size and should ideally be collected using some probability spatial sampling (see e.g. sp::spsample
). To estimate values of soil properties at standard depths, consider using mpspline
function.
Numeric resolution is derived as estimated RMSE/2. Numeric resolution can be best specified as Attribute_Measurement_Resolution
(the smallest unit increment to which an attribute value is measured).
Increasing N.sample
can lead to more precise results at the cost of higher computing time.
Tomislav Hengl
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