R-sig-Geo Digest, Vol 27, Issue 8
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 -----Original Message----- From: r-sig-geo-bounces at stat.math.ethz.ch [mailto:r-sig-geo-bounces at stat.math.ethz.ch]On Behalf Of r-sig-geo-request at stat.math.ethz.ch Sent: Thursday, November 17, 2005 3:00 AM To: r-sig-geo at stat.math.ethz.ch Subject: R-sig-Geo Digest, Vol 27, Issue 8 Send R-sig-Geo mailing list submissions to r-sig-geo at stat.math.ethz.ch To subscribe or unsubscribe via the World Wide Web, visit https://stat.ethz.ch/mailman/listinfo/r-sig-geo or, via email, send a message with subject or body 'help' to r-sig-geo-request at stat.math.ethz.ch You can reach the person managing the list at r-sig-geo-owner at stat.math.ethz.ch When replying, please edit your Subject line so it is more specific than "Re: Contents of R-sig-Geo digest..." 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.
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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 ------------------------------ _______________________________________________ R-sig-Geo mailing list R-sig-Geo at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo End of R-sig-Geo Digest, Vol 27, Issue 8