[R-sig-Geo] R-sig-Geo Digest, Vol 27, Issue 8
Randy Long
rlong at msce.com
Thu Nov 17 20:45:49 CET 2005
anybody get r to work in ARCGis 9.1? I am curious to see if the dll and hook
are the same as was done before in 8.1.
Thanks
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Today's Topics:
1. Software (R, free matlab toolboxes etc etc...) (Koen Hufkens)
2. Re: Software (R, free matlab toolboxes etc etc...) (Roger Bivand)
3. Re: Software (R, free matlab toolboxes etc etc...)
(Edzer J. Pebesma)
----------------------------------------------------------------------
Message: 1
Date: Wed, 16 Nov 2005 13:30:26 +0100
From: Koen Hufkens <koen.hufkens at telenet.be>
Subject: [R-sig-Geo] Software (R, free matlab toolboxes etc etc...)
To: AI Geostats mailing list <ai-geostats at unil.ch>, R geostat list
<r-sig-geo at stat.math.ethz.ch>
Message-ID: <437B2662.6010901 at telenet.be>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi list(s),
I'm looking for (free) geostatistical software that works with images
and not as much on point data.
I've been playing around with multiresolution wavelet decompositions and
I want to collect some statistical information of these images
(semivariance analysis, autocorrelation, Moran's I index, etc etc...).
For the time being I used R, the wavethresh package and the spdep
package. This latter was not optimal because the neighbour list
constructed by spdep becomes a little to much for my limited computer
system. So an additional R package would be great, but not necessary.
Other (free) alternatives would be great.
So what packages toolboxes etc. are not point based, and can handle
images? Any idea's, suggestions?
Best regards,
Koen
ps. excuses for double posting if you are a member of both lists, I try
to cover as much ground as possible in one e-mail.
------------------------------
Message: 2
Date: Wed, 16 Nov 2005 15:45:54 +0100 (CET)
From: Roger Bivand <Roger.Bivand at nhh.no>
Subject: Re: [R-sig-Geo] Software (R, free matlab toolboxes etc
etc...)
To: Koen Hufkens <koen.hufkens at telenet.be>
Cc: R geostat list <r-sig-geo at stat.math.ethz.ch>
Message-ID: <Pine.LNX.4.44.0511161431200.2976-100000 at reclus.nhh.no>
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Wed, 16 Nov 2005, Koen Hufkens wrote:
> Hi list(s),
>
> I'm looking for (free) geostatistical software that works with images
> and not as much on point data.
>
> I've been playing around with multiresolution wavelet decompositions and
> I want to collect some statistical information of these images
> (semivariance analysis, autocorrelation, Moran's I index, etc etc...).
> For the time being I used R, the wavethresh package and the spdep
> package. This latter was not optimal because the neighbour list
> constructed by spdep becomes a little to much for my limited computer
> system. So an additional R package would be great, but not necessary.
> Other (free) alternatives would be great.
Please state how large the images are, it isn't obvious what for example
global Moran's I would give you. Could you answer the same questions of
subscenes? Are the data likely to be non-stationary? How are you reading
the data into R, how are they represented? Even geostatistics will be hard
with many observed points, easier with many points to predict to.
>
> So what packages toolboxes etc. are not point based, and can handle
> images? Any idea's, suggestions?
You have looked at rimage, I suppose? Could you extend that?
Roger
>
> Best regards,
> Koen
>
> ps. excuses for double posting if you are a member of both lists, I try
> to cover as much ground as possible in one e-mail.
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>
--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no
------------------------------
Message: 3
Date: Thu, 17 Nov 2005 09:36:12 +0000
From: "Edzer J. Pebesma" <e.pebesma at geo.uu.nl>
Subject: Re: [R-sig-Geo] Software (R, free matlab toolboxes etc
etc...)
To: Koen Hufkens <koen.hufkens at telenet.be>
Cc: R geostat list <r-sig-geo at stat.math.ethz.ch>, AI Geostats mailing
list <ai-geostats at unil.ch>
Message-ID: <437C4F0C.2050805 at geo.uu.nl>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Koen Hufkens wrote:
>Hi list(s),
>
>I'm looking for (free) geostatistical software that works with images
>and not as much on point data.
>
>I've been playing around with multiresolution wavelet decompositions and
>I want to collect some statistical information of these images
>(semivariance analysis, autocorrelation, Moran's I index, etc etc...).
>For the time being I used R, the wavethresh package and the spdep
>package. This latter was not optimal because the neighbour list
>constructed by spdep becomes a little to much for my limited computer
>system. So an additional R package would be great, but not necessary.
>Other (free) alternatives would be great.
>
>So what packages toolboxes etc. are not point based, and can handle
>images? Any idea's, suggestions?
>
>
Hi Koen,
R package gstat (or the gstat stand-alone program) has two
optimizations built in for calculating semivariograms, the first for
large data sets, the second for gridded data:
1. it doesn't store the full pairwise distance matrix, but accumulates
semivariance and number of point pairs,
2. for gridded data, it derives distances from row/column index, instead
of recalculating them for each point, and it only evaluates point pairs
for which we know they need evaluation.
The first makes the calculation of semivariances possible within limited
memory, the second one makes the behaviour of the computation
closer to O(n), instead of O(n*n) for the case where you ignore
grid topology---this makes the computation scalable and feasable
for larger grids.
The documentation may not be all too clear on this, and perhaps
the user interface can be improved: not many people need this;
contact me on the gstat-info list for details where needed.
--
Edzer
------------------------------
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