[SOLVED] Add measurement uncertainty for kriging

Any question regarding the Interpolation method using Kriging

[SOLVED] Add measurement uncertainty for kriging

Postby AliciaGressent » Thu Oct 18, 2018 11:47 am

Hi all,

I would like to consider measurement uncertainty for kriging. Have you done this before?
Is there any option in the kriging function to add this uncertainty?

Thanks a lot,
Best,

Alicia
AliciaGressent
 
Posts: 1
Joined: Thu Oct 18, 2018 10:16 am

Re: Add measurement uncertainty for kriging

Postby Fabien Ors » Wed Oct 24, 2018 9:29 am

Hi Alicia

There is an option in RGeostats which offers you the possibility to take into account the variance of measurement error (VME) while kriging.
You have to add a variable in your input database using the locator "v" which contains VME values for each sample.

Here is an example with two points (the first one with no measurement error and the second one with a big one).
Hope this helps !

Code: Select all
library(RGeostats)
# Variogram model (exponential)
model = model.create(2,range=20)
# Targets grid
grid = db.create(nx=c(100,100))
# Neighborhood (unique)
neigh = neigh.create(type=0)
# Input dataset
dat = db.create(x1=c(20,30),x2=c(50,50),z1=c(-1,1))
# Simple kriging without measurement error
res1 = kriging(dat,grid,model,neigh,uc="",mean=0)
plot(res1,title="Kriging without VEM",pos.legend=1)
plot(dat,add=T,pos.legend=7)
# Add measurement error on the second point only
datm = db.add(dat,error=c(0,100),loctype="v")
# Simple kriging with measurement error
res2 = kriging(datm,grid,model,neigh,uc="")
plot(res2,title="Kriging with VEM",pos.legend=1)
plot(datm,add=T,name.prop="error",pos.legend=7)


KrigWithoutVEM.png
KrigWithoutVEM.png (7.17 KiB) Viewed 296 times

KrigwithVEM.png
KrigwithVEM.png (7.57 KiB) Viewed 296 times
Fabien Ors
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