Displaying 20 results from an estimated 500 matches similar to: "merge maps from shapefile to lattice"
2005 Sep 28
1
Access to particular predict value
Hi everybody:
I just generate interpolation maps with differents methods, like IDW and
kriging, and now i want to compare the predict values versus real, and i
don't who is the commant to do it. I want for example, if I pass from console
the coordinates of a place, return me the predict value.
Could anybody tell me how should do?.
Thanks in advance
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2005 Sep 30
1
Compare predict and experimental values
Hi everybody:
I just generate different maps of interpolation with different methods but
with the same package -(gstat, i used the krige command). And now for
evaluate the best method i want to compare the predict values versus
experimental, but i don't know how do it.
Could anybody tell me how should do it?.
Thanks in advance.
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Antoni Vi??dez
2011 Jul 13
3
adding text to spplot
hi all,
I have a plot to which i would like to add text labels. And i cant find a way...here is the code :
enaD2<-idw(D2~1, loca=dva, newdata=grd)
pts = list("sp.points", dva, pch = 20, cex=1.5, col = "darkred
spplot(enaD2, "var1.pred",sp.layout=pts, main = "globina 60 cm", sub="D2",
2011 Mar 04
2
make an own (different) color legend with spplot()
Hi!
Is there a way to manually costumize the color legend in an spplot() -
especially where to draw ticks and labels for the ticks?
The reason I'm asking: Usually spplot() automatically divides the data
into fitting slices and makes a color legend (also automatically).
I want to assign the slices myself and have a fixed scale instead of an
automatic/dynamic scale.
I think what I want
2011 Mar 05
3
Change panel background color in spplot()
Hi!
How does one change the background color of the map-panel in spplot()?
Example:
library(sp)
data(meuse.grid)
gridded(meuse.grid) = ~x+y
spplot(meuse.grid, "part.a")
How would I get another background-color for the map-panel (but not for
the whole plot) here?
Thank you!
Marcel
2011 Oct 05
2
kriging shapefiles
Hi! Im new to R and I need to interpolate a shapefile using kriging. I've been able to plot/read the shapefile using the package maptools or rgdal. I've searched the internet for sample codes but most of the kriging codes that I've found done in R is done using txtfiles or CSVs. An example could be of great help. Thanks.
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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?
2011 Jun 03
1
R and DBSCAN
Hello everyone,
When looking for information about clustering of spatial data in R I was
directed towards DBSCAN. I've read some docs about it and theb new
questions have arisen.
DBSCAN requires some parameters, one of them is "distance". As my data
are three dimensional, longitude, latitude and temperature, which
"distance" should I use? which dimension is related to
2012 Feb 24
1
Producing KML files
Hi,
I am very new to R and I am trying to write KML files. I am running R-2.13.1 and I have the following packages:
- AKIMA
- RGDAL
- RSAGA
- SP
I was trying to run the simple example that I found at the following web page:
http://spatial-analyst.net/wiki/index.php?title=Export_maps_to_GE
The lines that I can run are:
data(meuse.grid)
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 Jan 27
2
plotting the coordinates versus dates
Hello!
I have a dataset with the dates and positions - Lat and Long columns
How do I make a scatter plot?
Do I have to cbind to combine the Lat and Long columns?
Any suggestions will be much appreciated!
Thank you
Julia
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2005 Jun 10
1
In connection with the creation of a grid of point with gstat
Hi ALL,
With the pakage gstat
How can one create a grid of points as in the meuse.grid example, from
measuring sites as in the Meuse example
Thanks in advance!
Alain PONSERO
Conservateur
Réserve Naturelle de la Baie de Saint-Brieuc
site de l'Etoile
22120 HILLION
tel/fax : 02.96.32.31.40
<mailto:aponsero@cabri22.com> aponsero@cabri22.com
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
2006 Apr 25
3
persp plot increasing 'x' and 'y' values expected
hello,
i do the following in order to get an persp-plot
x<-c(2,2,2,2,2,2,3,3,3,3)
y<-c(41,41,83,83,124,166,208,208,208,208)
z<-c(90366,90366,92240,92240,92240,96473,100995,100995,100995,100995)
x<-data$x
y<-data$y
z<-matrix(data$z,length(y),length(x))
persp(x,y,z, col="gray")
but i always get the error message increasing 'x' and 'y' values
expected,
2010 Jun 14
1
Install Rmpi
Hi everyone
As I couldn't succeed with manual installation of Rmpi I decided to
start again from the beginning. I removed R and MPICH in my Ubuntu Hardy
installation. Then, to avoid any dependencies problems I have installed
MPICH and R from synaptic, not from sources. But now I can't install Rmpi.
An error message appears when trying to install Rmpi, you can find in
2009 Dec 23
5
iid.test
I downloaded the iid.test, but I can't run it. I get the following message:
Error: could not find function "iid.test"
Where am I supposed to save this package in order that it works?
Thanks,
EZ
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2007 Oct 05
1
using spplot (sp package) with 5 quantiles
Hi,
I'm using R 2.5.1 and gstat 0.9-39 library and I'm working with the
jura data set provided by gstat library.
I tried to plot a graph of metal concentrations (let's say Cd) with
the command spplot, but I realized that the default lags are equally
distributed between Min and Max. I did:
library(gstat)
data(jura)
jura.pred.xy <- jura.pred
names(jura.pred.xy)[1:2] <-
2007 Apr 25
1
Help with saptial analysis (cluster)
Hi R-users
I'm a beginner with R and statistics, so I need some help to start my data
analysis. I've been reading some docs and tutorials on R and cluster analysis.
I've got a large dataset (102000 points) with values of longitude, latitude and
temperature and want to see if I can find groups (clusters).
Following some tutorials I can look for principal components but get an error
2009 Dec 11
3
Please help with a basic function
Hello,
I am learning how to use functions, but I'm running into a roadblock.
I would like my function to do two things: 1) convert an object to a
dataframe, 2) and then subset the dataframe. Both of these commands work
fine outside the function, but I would like to wrap them in a function so I
can apply the code iteratively to many such objects.
Here's what I wrote, but it doesn't
2008 Jun 23
2
Handle missing values
Hi everyone
I am new to R and have a question about missing values. I am trying to
do a cluster analysis of monthly temperatures and my data are 14 columns
with spatial coordinates (lat,lon) and 12 monthly values:
/lat - lon - temp1 - //temp2 - temp3 - .... - //temp12/
If I omit missing values (my missing values are 99.00) with
/mydata <- na.omit(mydata)/
every row with a