Displaying 20 results from an estimated 1000 matches similar to: "Interpolation or Kriging"
2004 Aug 25
1
Newbie Question: Spatial Autocorrelation with R Tutorial?
Howdy All,
I am looking for some good tutorials (books, websites, whatever) for calculating/testing for Spatial Autocorrelation using R.
Specifically, I am wanting to test for autocorrelation of a number of variables measured at a set of discrete locations.
Up to this point I have been exploring the "spdep" package and I can get "moran.test" to work, but I am concerned that
2003 Oct 10
1
R(D)-COM stat conenctor for ArcGIS
Hi everybody,
I heard about "R(D)-COM Stat connector" for ArcGIS, but i am not
sure what that is. I did a search in the archive but it seems i am
not getting anything back.
can anybody explain me what that is, and where i can find more
info about it? There is any possibility to run R from inside
ArcGIS?
there is more than RArcInfo and Shapefile which can
2004 Nov 11
3
(no subject)
Hi,
I have a list of numbers. For each of the numbers, I take sum of squares of
the numbers centered on the number chosen. If it is less than a certain
constant, I will take the average of the numbers chosen.
Anyone can give me a sample code. You help will be greatly appreciated.
Peter
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2013 Apr 04
5
help with kriging interpolation
All,
I am new to using R and know some basics. I wish to use kriging in R to
do the following:
given data Y =f(X1,X2,X3,.....,Xn) --1000+ irregular measured data set.
I would like to be able to get a single value y given sinle input set
(x1,x2,x3,...xn)
A google search on this takes me lierally to the same example on involving
analysis with soil sampling and I cannot figure out how to
2003 Jan 17
3
kriging in R
Hi, all,
Have anyone used kringing included in R? How is it?
Does it handle anisotropy data well?
How does it compare with Kriging in Arc/Info? or other geostatistics
software customized to do kriging or other geostatistics functions?
I tried Easykriging, a geostatistics tool developed for Matlab. It has
very nice GUI, but it does not provide library which i can call in my programs.
so it is
2003 Oct 21
1
Indicator Kriging
Hi R-Users
Is there any package in R that work Indicator Kriging?
Or somebody is working in a link between GSLIB library in
FORTRAN for R?
Thank you very much for your help.
--
2003 Oct 31
2
Therotical basis of Kriging
hello
I want to know about therotical basis of Kriging in elemantary level.
I will appreciate if anyone sends me address,link,e-documents, etc..
kind regards
--
Ahmet Temiz
General Directory of Disaster Affairs
Ankara TURKEY
______________________________________
Inflex - installed on mailserver for domain @deprem.gov.tr
Queries to: postmaster at deprem.gov.tr
2004 Feb 16
2
Data for use in maps()
Dear all,
I am interested in plotting maps visualizing spatial statistics in an
aggregated fashion, according to administrative boundaries.
More specifically, I have fitted a cross-section model on data regarding
Italian "counties" (province, for Italian readers) and I would like to
visualize residual behavior on a map, in order to have a first
assessment of their spatial
2003 Nov 14
1
spatial modeling
I am new to R and have a question about spatial econometrics. I have
noticed that you can easily test for spatial autocorrelation with the
spdep package, but was wondering if any code has been written to correct
for spatial autocorrelation? Or if there is any literature on this?
Thanks. -Jill
***************************************************
Jill L. Caviglia-Harris, Ph.D.
Assistant
2013 Feb 17
0
What value to put in range when I make kriging interpolation?
Hi, I am trying to make an automatic kriging interpolation algorithm.When I use the fit.variogram function what would it be a good startingvalue for the range?
ThanksDimitris
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2003 Sep 21
3
Z aware interpolation
Hello again,
There is any package which does Z aware (real 3D) interpolations?
It can be any method (IDW, kriging or spline) but it should take into
consideration not only x and y coordinates for interpolation, but
also z coordinate. I looked into different packages but it seems i
didn't find the right one.
The ultimate goal is to import the output into a GIS (Geographical
Information
2007 Dec 04
1
2/3d interpolation from a regular grid to another regular grid
Hello R users,
I have numerical data sampled on two grids, each one shifted by 0.5
from the other.
For example:
grid1 = expand.grid(x=0:3, y=0.5:2.5)
grid2 = expand.grid(x=0.5:2.5, y=0:3)
gridFinal = expand.grid(x=0.5:2.5, y=0.5:2.5)
plot(gridFinal, xlim=c(0,3), ylim=c(0,3), col="black", pch=19)
points(grid1, xlim=c(0,3), ylim=c(0,3), col="red", pch=19)
points(grid2,
2003 Jun 26
1
krige in gstat() package
HI,
I wonder does anyone have experience with doing sequential gaussian
simulation with krige() function in gstat?
I find it VERY slow compared to use krige() to achieve kriging function
itself.. I wonder why, is that because it has to model the variogram, and
do the kriging separately for each point to be simulated?
so it would be N times slower to achieve the simulation than the kriging
if
2005 Jan 30
1
New user...tips for spdep?
Hello List,
I'm a very new user to the R system. I'm only beginning to learn the
basics, but so far I've been able to do little more than try a few examples,
and of course begin reading the documentation.
My primary motivation for exploring R is the availability of tools like the
'spdep' package for calculating spatial statistics such as Geary's C and
Moran's
2011 Sep 14
1
S4 method dispatch
List,
In order to get rid of some old, unreadable S3 code in package sp, I'm
trying to rewrite things using S4 methods. Somewhere I fail, and I
cannot sort out why. In order to isolate the problem, I created two
functions, doNothing<- and dosth, and both should do nothing. The issue
is that in most cases they do nothing, but in some cases dosth(obj)
changes the class of obj and breaks with
2003 Aug 17
1
(no subject)
Hi all,
>str(df)
`data.frame': 31837 obs. of 3 variables:
$ x : num 410683 410700 410720 410740 410324 ...
$ y : num 43136 43126 43123 43125 42709 ...
$ wz: num -101.1 -94.9 -93.3 -94.5 30.8 ...
>library(gstat)
>g<-gstat(id="rv",form=wz~1,loc=~x+y,data=df,model=mat,nmax=500,set=list(average=1))
>str(g)
List of 3
$ data :List of 1
..$ rv:List of 10
..
2007 Feb 06
1
heatmap from xyz data
Hi,
I've got some data in a data frame arranged like this:
x y z othervariables ....
0.1 0.2 1.7 0.01 ....
0.2 0.2 1.3 0.23 ....
0.2 0.3 1.1 0.43 ....
etc
I'd like to plot a heatmap of this data, with x and y as the (x,y) co-
ords and z defining the colour at each point.
I'm having difficulty finding the correct functions to use. Can
anyone make any recommendations?
It seems
2005 Oct 28
4
clustering
Hi everybody,
I'm performing a cluster analysis (pkg "cluster") on a
dataset which includes 15 variables: is there a way to
know how much each variable weighs on the final
clustering output?
Thanks
Alessandro
2003 Apr 17
0
kriging in R
Hi
If you read the description of "varcov.spatial" you'll see that it is
used to *predict* a covariance matrix, based on the parameters of the
covariance function. So you don't need the oebserved data, you need
parameters for the covariance function.
Regards
EJ
On Thu, 2003-04-17 at 05:43, Yan Yu wrote:
> THanks for the suggestion.
> I have a Q when trying to use it..
2002 Mar 27
1
kriging C/C++ code
Hello to everybody !
I don't have a question directly connected with R, but it takes starting
point from the use of the R function Krig for kriging interpolation and
from the idea of making a different implemetation of the function for my
purposes.
Doas anyone know where can I find free C or C++ codes of kriging ?
As always, thanks a lot in advance,
Paola.