Dear Ivailo,

Is this method can be used to quantify the spatial variability of two
raster grids? Or Is there other measurement will be better to do this?

Previously I posted a topic on how to compare two grids regarding to see
the difference on spatial variabilities(e.g. two temperature grids). I am
still wondering how to do it.

Look forward to hearing from you.

Thanks,

Ping

I got your message from the

On Mon, May 13, 2013 at 3:51 AM, Rainer M. Krug <Rainer@krugs.de> wrote:

>
> p m <stagis0@gmail.com> writes:
>
> > Dear all,
> >
> > I'm looking for a test to identify significant differences
> > (p-value) between 2 raster maps.
> >
> > Can you suggest me a way to solve this problem?
>
> Hi
>
> Based on my understanding, you *can not* get a p value for the
> difference between two entities - to ask if the two maps are
> significantly different, is like asking if the two numbers 1 and two are
> significantly different.
>
> You can only answer that question if you know the underlying
> distributions and can compare these.
>
> What you can do is quantifying the difference between the two maps. One
> approach I used is the Earth Movers Distance, implemented in two
> packages:
>
> http://www.rforge.net/doc/packages/emdist/emd.html
> (implemented by myself and Dirk Eddelbuettel and used in some projects) and
>
> http://cran.r-project.org/web/packages/emdist/emdist.pdf
>
> by Simon Urbanek (haven't used it).
>
> But there are many other distance measures to quantify the difference
> between two raster maps. Which one you choose, depends on your question.
>
> Cheers,
>
> Rainer
>
> >
> >
> > Thank you in advance.
> >
> > Paul
> >
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> >
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>
> --
> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
> Biology, UCT), Dipl. Phys. (Germany)
>
> Centre of Excellence for Invasion Biology
> Stellenbosch University
> South Africa
>
> Tel :       +33 - (0)9 53 10 27 44
> Cell:       +33 - (0)6 85 62 59 98
> Fax :       +33 - (0)9 58 10 27 44
>
> Fax (D):    +49 - (0)3 21 21 25 22 44
>
> email:      Rainer@krugs.de
>
> Skype:      RMkrug
>
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