[R-sig-Geo] help: krigged map do not show colours

[Jon Skoien]

Hi,

You have attached some data, but we still dont know exactly what you do 
with the data (do you use the logarithm, how many bins, did you project 
the data set...?). However, having had a quick look using the LatLong 
coordinates (not really recommended), I can see that the variogram from 
this data set is not particularly well defined, and it could well be 
that you fitted a model with pure nugget effect. In that case you will 
get the same prediction everywhere and no color differences.

Have a look at
 > summary(map)
and particularly the summary of var1.pred.
You could also plot the variogram of the data together with your model, 
vmf, and see how they fit.

I am not sure what you mean by not being able to create a prediction 
grid with data included. Do you mean that you want a grid which exactly 
overlays some of the data points? Matching one point should not be 
difficult, 2 and 3 should be possible, but you might get some problems 
with precision (FAQ 7.31).

Best wishes,
Jon



On 8/3/2015 5:30 PM, Anand Sookun wrote:
> Hi
>
> Thank you Roman for your kind response.
>
> The data is as attached which is part of the whole dataset.
>
> My other problem is that im not able to create an appropriate 
> prediction grid with some data included.
>
> The codes which failed to show colour ramps are
>
> map <- krige(logcarbseq ~ 1, locations = carbon_seq, newdata = 
> map,model = vmf)
> str(map)
> print(spplot(map, "var1.pred", asp=1, 
> col.regions=bpy.colors(64),main="OK prediction, carbon"))
> print(spplot(map, "var1.var",col.regions=cm.colors(64),asp=1, main="OK 
> prediction variance, carbon"))
>
> I look forward to hopefully get some solutions.
>
> Thanks again and warm regards
>
> Anand
>
> On Mon, Aug 3, 2015 at 4:09 PM, Roman Luštrik <roman.lustrik at gmail.com 
> <mailto:roman.lustrik at gmail.com>> wrote:
>
>     What is the variability of the plotted variable?
>
>     Cheers,
>     Roman
>
>     On Sun, Aug 2, 2015 at 11:03 AM, Anand Sookun <asookun at gmail.com
>     <mailto:asookun at gmail.com>> wrote:
>
>         Hi
>
>         I have kriged my data but the map shows uniform colours - no
>         gradual
>         contour colour plot on map
>
>         code: print(spplot(k40, "var1.pred", asp=1,
>         col.regions=bpy.colors(64),main="OK prediction, log-ppm Zn"))
>
>         thnaks for any help
>
>         Anand Sookun
>         --
>         -------------------------------------------------------
>         *Anand Sookun (**MPhil. **PhD Candidate, University of Mauritius)*
>         *Director cum Freelance Consultant*
>         *Soft Sustainable Services (Mauritius)*
>         *Research and Consultancy*
>
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>
>
> -- 
> -------------------------------------------------------
> /*Anand Sookun (*//*MPhil. *//*PhD Candidate, University of Mauritius)*/
> /*Director cum Freelance Consultant*/
> /*Soft Sustainable Services (Mauritius)*/
> /*Research and Consultancy*/
>
> Website: http://sustain-ability.webs.com/
>
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-- 
Jon Olav Skøien
Joint Research Centre - European Commission
Institute for Environment and Sustainability (IES)
Climate Risk Management Unit

Via Fermi 2749, TP 100-01,  I-21027 Ispra (VA), ITALY

jon.skoien at jrc.ec.europa.eu
Tel:  +39 0332 789205

Disclaimer: Views expressed in this email are those of the individual and do not necessarily represent official views of the European Commission.


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