Displaying 20 results from an estimated 1000 matches similar to: "sample variogram construction"
2000 Oct 20
1
Covariace or variogram surface
Hi
I'm interested in doing a anisotropy analysis of some spatial data and I
want to do a contour plot of a covariance or variogram surface to
visualize the directions of maximal and minimal anisotropy.
I know how to do a contour plot :-) but how can I obtain the variogram
surface having a geoeas format dataset (X, Y, Z) ?
Thanks
EJ
2001 Oct 18
1
Sgeostat module
Dear Users,
I use Sgeostat to calculate co variogram (function est.variogram with two
variables).
If i inverse the 2 variables in the functions, the co variogram change!
Normaly it is symmetric, isn't it?
Someone could me explain why, or give me an idea to calculate co variogram
in a easy way...
Thanks in advance
Laurent
ps : sorry for my english
Laurent William Dubroca
Centre de
2000 May 09
1
Work with sgeostat library!
Hello, everybody:
I will like to know if anybody else is working with the
sgeostat library and where can I find some other
fuctions to fit more variogram models (like a kernel one).
Thank you very much for you help
Kenneth Cabrera
Universidad Nacional de Colombia
Sede Medellin
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2000 Aug 11
1
Problems in the new version with sgeostat library?
Hello, R-users!
When I load the sgeostat library I obtain some warnings messages.
>library(sgeostat)
What kind of problem will I expect to have with these messages?
Loading required package: mva
Loading required package: tripack
Warning messages:
1: `provide' is deprecated.
See ?Deprecated. in: .Deprecated()
2: `provide' is deprecated.
See ?Deprecated. in: .Deprecated()
Thank you
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
2009 Mar 24
1
Variogram with Gstat
Dear all can you help me? i have this problem: i have a dataset in a text file
in a matrix of 3 columns: x, y, z where x and y are the coordinates and Z are
the mesurements. How can i do a variogram with R?
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
2008 Jun 04
1
problems with variogram
Hello,
I have data at 10 locations, in each location there are time series
(T=56). Question is: when I?m fitting variogram what happens with those
measures in each location? Are they taken as repeated measures? It's very
important for my to know this
Thanks a lot
2017 Sep 24
1
R version 3.3.2, Windows 10: gstat package: Error in fitting a variogram model using 'fit.variogram' function
Dear Members,
I am trying to fit a variogram model using fit.variogram function from the gstat package. The figure showing my experimental variogram can be seen here: https://i.stack.imgur.com/UZXw4.png
My code line for this operation is:
> c2.vgm.fit<-fit.variogram(c2.vgm.exp,vgm(nugget=0, psill=400,model="Exp",range =40000),fit.method = 7)
The system throws following error
2006 Mar 13
2
Error Message from Variogram.lme Example
When I try to run the example from Variogram with an lme object, I get
an error (although summary works):
R : Copyright 2005, The R Foundation for Statistical Computing
Version 2.2.1 (2005-12-20 r36812)
ISBN 3-900051-07-0
...
> fm1 <- lme(weight ~ Time * Diet, BodyWeight, ~ Time | Rat)
Error: couldn't find function "lme"
> Variogram(fm1, form = ~ Time | Rat, nint =
2006 Jun 03
1
default value for cutoff in gstat variogram()
I wonder what is the default value for the argument 'cutoff' when not
specified in the variogram.formula function of gstat. Computing
variogram envelops within gstat, I am comparing the results obtained
with variog in geoR and variogram in gstat, and it took me a while
before understanding that the cutoff default value is not the maximum
distance.
Can Edzer tell us about it?
All the
2002 Apr 11
3
new acf package
I'm a PhD student and I'm working with covariance function. I'm interested
to know if exist some packages in R to calculate and plot the
bidimensional Autocovariance Function. the input matrix is a matrix that
describe a spatial location over a 2-D space and I want to use it in the
same way I can use a time serie in the 1-D acf.
Thanks,
Nicola.
2002 Apr 11
3
new acf package
I'm a PhD student and I'm working with covariance function. I'm interested
to know if exist some packages in R to calculate and plot the
bidimensional Autocovariance Function. the input matrix is a matrix that
describe a spatial location over a 2-D space and I want to use it in the
same way I can use a time serie in the 1-D acf.
Thanks,
Nicola.
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
2005 Jun 24
2
definition of variogram
hello
I need basic explanation of variogram
and how to use in R.
I will appreciate if you supply them.
regards
Ahmet Temiz
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Queries to: postmaster at deprem.gov.tr
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2009 Oct 08
1
variogram
Hello everybody,
I want to run the following R-code, but it does'nt work.
> res.vgm = variogram(ertrag ~ rep, # !!!
+ loc = ~ xpos + ypos, # !!!
+ width = start.range / 10,
+ data = d)
Error in vector("double", length) : element 2 is empty;
the part of the args list of '.Internal' being evaluated was:
2005 Nov 15
1
Linear model mixed with an ARIMA model
Dear all,
I'm looking for how can I input a linear model with an arma model,like
log(y) = 8.95756 + 0.0346414^t - 0.1*t^2 + ut
ut=-0.296ut-1+at-0.68at-1
where log(y) is qudratic function ,for the time series trend,
and get then get the residuals from the first function.
" obersvations value - the fit value = ut"
and fit an ARIMA(1,1,1) model for ut.
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
2003 Sep 10
1
geoR variogram problem
Dear GeoR-er,
If I use the variog function in the latest release of geoR, the first lag is
always ignored.
For instance, if you read in geodata, calculates the variogram using the
variog function and give in a uvec like uvec=seq(0,max,by=2.44), it only
starts giving results from distance=4.88 and ignores 2.44!
This wasn't the case in former versions of geoR. Is this done on purpose?
Why?
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]