[GRASS-user] IDW (or similar) and cost surface

GRASS GRASS user
1

Does anyone know of implementations of an IDW (or other distance weighted interpolators) which can use a cost surface as a supplementary weighting factor?
I’m exploring solutions to do spatially constrained interpolation, and modelling barriers through cost surfaces could be a way to do it…

thanks,
giovanni

2

I have implemented a while ago a cost-based kriging that I used exactly
in that way.
You can see the paper and sample code here:
http://www.geeitema.org/guenmap/index.jsp?opcion=resultados&idioma=en

There is a GRASS script that helps to compute the cost-based distances,
and then there is an adapted geoR library that performs the cost-based
kriging computations.

Let me know if you need help in applying it to your case.
    ƒacu.-

El mar 06 dic 2011 18:11:52 CET, G. Allegri escribió:

Does anyone know of implementations of an IDW (or other distance
weighted interpolators) which can use a cost surface as a
supplementary weighting factor?
I'm exploring solutions to do spatially constrained interpolation, and
modelling barriers through cost surfaces could be a way to do it...

thanks,
giovanni

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3

Thanks Hamish and Facundo!
I will give a try to the updated v.surf.icw soon :wink:
If I find some time I will try a python porting anyway, as a personal exercise with the new grass7-python facilities.

Thanks Facundo, I was also looking for similar implementations with kriging. The same for icw, I will read and have a look to the code you shared ASAP.

giovanni

2011/12/7 Facundo Muñoz <famuvie@alumni.uv.es>

I have implemented a while ago a cost-based kriging that I used exactly
in that way.
You can see the paper and sample code here:
http://www.geeitema.org/guenmap/index.jsp?opcion=resultados&idioma=en

There is a GRASS script that helps to compute the cost-based distances,
and then there is an adapted geoR library that performs the cost-based
kriging computations.

Let me know if you need help in applying it to your case.
ƒacu.-

El mar 06 dic 2011 18:11:52 CET, G. Allegri escribió:

Does anyone know of implementations of an IDW (or other distance
weighted interpolators) which can use a cost surface as a
supplementary weighting factor?
I’m exploring solutions to do spatially constrained interpolation, and
modelling barriers through cost surfaces could be a way to do it…

thanks,
giovanni

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