Calibration of SoilGrids data with ground based point data

[Muhammad Iqbal]

Dear SoilGrids Community, 

Greetings from Pakistan. I am new to this forum and has found it highly valuable in terms of discussion on SoilGrids data. I want to get advice related to calibration of SoilGrids data with the ground based point data. Can you guide me about the best techniques/tools to do this? I would be grateful if some detailed guide document or any reference document can be shared.

Many regards

Muhammad Iqbal

[Gabriela Zuquim]

Dear community,

I am trying to extract data from a spatial datapoints file using the GSIF package. I am getting an strange error message. 

Even by copy-pasting the code from the tutorial (see below), I get the same message: 

> ov <- over(soilgrids.r, pnts)
Error in .local(x, y, ...) : object 'ret' not found

library(rjson)
library(sp)
## 2 points:
pnts <- data.frame(lon=c(10.65,5.36), lat=c(51.81,51.48), id=c("p1","p2"))
coordinates(pnts) <- ~lon+lat
proj4string(pnts) <- CRS("+proj=longlat +datum=WGS84")
pnts
## REST example:
soilgrids.r <- REST.SoilGrids(c("ORCDRC","PHIHOX"))
ov <- over(soilgrids.r, pnts)
str(ov)

Any ideas!?

Gabriela

Dr. Gabriela Zuquim
Mobile: +358 40 512 1981

Department of Biology, Aarhus University, Denmark. 

https://bios.au.dk/om-instituttet/organisation/oekoinformatik-biodiversitet/projects/amazonian-biogeography/

Department of Biology, University of Turku, FI-20014 Turku, Finland.

https://sites.utu.fi/amazon/

Programa de Pesquisas em Biodiversidade (PPBio -INPA, Manaus)
http://ppbio.inpa.gov.br/

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