Displaying 20 results from an estimated 1000 matches similar to: "Spatial regression"
2006 Aug 20
3
plot problem
Hello.
I'm pretty much new to R and I'm trying to produce some figures.
It seems to me, that R has some asynchronous way of plotting figures.
When I run this code:
#constructs the semivariogram of SC1929
vgm1 <- variogram(SC1929~1,~U+V,puerto.map$att.data)
# trying to make new plot
dev.set(which=dev.next())
plot(vgm1)
title(main="Semivariogram",font.main=4)
2005 Nov 08
2
Variogram
Dear All,
Is there anybody has the experience in using variogram(gstat) ? Please kindly give me some hints about the results.
I used variogram() to build a semivariogram plot as:
tr.var=variogram(Incr~1,loc=~X+Y,data=TRI2TU,width=5)
then fir the variogram to get the parameters as:
v.fit = fit.variogram(tr.var,vgm(0.5,"Exp",300,1))
v.fit
model psill range
1 Nug 1.484879
2008 Aug 05
4
LIDAR Problem in R (THANKS for HELP)
Hi All,
I am a PhD student in forestry science and I am working with LiDAR data set
(huge data set). I am a brand-new in R and geostatistic (SORRY, my
background it?s in forestry) but I wish improve my skill for improve myself.
I wish to develop a methodology to processing a large data-set of points
(typical in LiDAR) but there is a problem with memory. I had created a
subsample data-base but
2007 Jan 05
1
gstat package. "singular" attibute
Hello,
I'm using the gstat package within R for an automated procedure that
uses ordinary kriging.
I can see that there is a logical ("singular") atrtibute of some
adjusted model semivariograms:
.- attr(*, "singular")= logi TRUE
I cannot find documentation about the exact meaning and the implications
of this attribute, and I dont know anything about the inner calculations
2009 Mar 03
1
spatial markov chain methods
Hello,
can any one point me to R-packages (if available) which include spatial
Markov Chain methods?
My second question is more general but hopefully not OT: Currently we
are using the software TPROGS, which let people simulate property
distributions in space by some Markov Chain approaches. We face some
problems due to the lack of information between distances of samples
along borehole path
2008 Apr 29
2
Variogram problem
Hello,
I'm french and I have some difficulties in carry out the semiones under R
with an aim to carry out an interpolation by krigeage. My goal is to obtain
a chart of the distribution of precipitations/temperatures in Europe
starting from 73 different stations (and, of course, distributed irregularly
on the chart, where use of the krigeage). Here, I carried out this to test
to obtain
2008 Apr 01
1
spatial cross-correlation
Hi;
I cannot find in the R html documentation a way to evaluate
cross-correlation in 2D data sets.
I would like to evaluate cross-correlation in a series of moving windows
between two maps.
i,e, specify several windows inside the complete 2D spatial matrixes and
for each one ofthese windows evaluate the 2D cross-correlation (commonly
conducted in the spectral domain).
Thanks in advance and best
2003 Jul 31
1
spatial statistics vs. spatial econometrics
Dear R users,
I am putting together reading and resources lists for spatial statistics and spatial econometrics and am looking for some pointers from more experienced practitioners.
In particular, I find two "camps" in spatial modelling, and am wondering which approach is better suitied to which situation.
The first camp is along the lines of Venables and Ripley's Chapter 14
2005 Nov 09
2
Variograms and large distances
Hello R list,
I need to compute empirical variograms using data from a large
geographic area (~10^6 km2). Although I could not find a specific
reference, I assume that both geoR and gstat calculate distances among
data points assuming points are on a flat surface (using the Pythagorean
Theorem). Because the location of my data is large and located near the
pole, assuming that latitude and
2011 Mar 25
1
spatial stats - geoR - variogram - standard deviation
Hello,
I am attempting to get the standard deviation in multiple distance bins in
my spatial data.
It appears as though the 'variog' command in the geoR package will do the
trick, as one of the outputs from 'variog' is 'variog$sd', which,
according to the manual, is the "standard deviation of the values in each
bin".
However, when I run this command, the
2009 Jun 10
2
plot two variograms on a same graph
Hi,
I would know how to plot two variograms on a same graph. I can plot one by one but I would draw both on the same one.
Is it possible? Do i need any special package?
Thanks!
Cordialement
Damien Landais
2010 Nov 17
1
Please, help me with 'mattern' variogram
Hi, R-folks:
I have been tryin many combination of parameter to make Matern variogram to work, but I can't find the available one. I'm near to be crazy.
I tiped:
A?o2003Selg.lf<-likfit(A?o2003Selg,cov.model="matern",ini.cov.pars=c(1.5,14),kappa=2.5,fix.kappa=FALSE,nugget=0.08,lambda=0.008,fix.lambda=FALSE,hessian=TRUE)
the hessian shows:
$hessian
[,1]
2004 Sep 16
1
geoR/variog4() not returning all directions
Mac OS 10.3.5, R 2.0.0
latest version of geoR
I have an incomplete 5 x 20 spatial array of samples (60 out of 100
possible locations) for which I would like to calculate directional
variograms using variog4(). Unfortunately, I can't get it to return all
4 directions. It returns variograms for 45, 90, and 135 degrees,
omitting 0 degrees (pi/4, pi/2, 3pi/4, omitting 0). If I specify 0
2011 Jan 03
1
Modules for using geostatistics for image classification
Hello everyone!
I am using GRASS with spgrass6 for my work. I will be using variograms in
the process of landsat image classification. I am quite ok with GRASS but am
finding R really tough. I understand that spgrass6 is a link between GRASS
and R which can read and write raster/vector layers. Out of really many
packages in R, for generating variograms out of landsat images which
packages of R
2004 Oct 05
1
Bug in optim - way to solve problem?
Hi,
I want to automatically fit variograms to a large number of different
sample data sets, and call the funtion "likfit" (in package geoR) from
within a for-loop. "likfit" does again call "optim". After ssuccessfully
fitting variograms to some of the data sets, the procedure crashes and I
get the error message:
Error in optim(par = ini, fn = negloglik.GRF,
2009 Sep 08
1
gstat---2 basic plot questions
Hi all--
I'm new to R, statistics and programming, so sorry if this is a really basic
question!
I have plotted a directional variogram, and I want to
a. overlay the omni-directional line over each directional panel
b. display the directional variograms in a single panel with a legend that
associated each line to each degree measurement.
The line I'm using is
2001 Feb 28
1
re: Spatial stats: R vs. Splus
Hello,
Could someone tell me whether the spatial statistics module of
Splus is worth the rather high price, or whether one could (with
reasonable effort) carry out the same things using R and some of
its contributed packages.
Although we do have Splus (Windows and Unix), we definitely prefer
to use R whenever feasible (both for research and teaching).
Thanks for developing a superb
2004 Mar 16
2
graphical interface
Dear R users,,
I'm having difficulties when i use the gstat extensions in R
especially with the graphical interface, as the
variograms plots are depicted with gray background and cyan points for the number of pairs, Consequently the fitted variogram
is drawn in cyan,
How can i change that so i could have, white background and
black lines for the fitted variogram, for the complete plot.
2008 Jul 31
1
anisotropy in vgm model. HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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indicato...
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URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20080731/d5bf0e31/attachment.pl>
2010 Oct 29
2
doubt in climate variability analysis in R!
Hello all,
I am trying to use "clim.pact" package for my work, but since this is the beginning for me to use gridded datasets in "R", I am having some trouble.
I want to do seasonal analyses like trends, anomalies, variograms, EOF and probably kriging too to downscale my 1 degree gridded data to 0.5. So, as a first step, I compiled my entire dataset (with 25