Hi Pilar,
I think this list appropriate :). What would be a good idea is to get a
book that describes kriging, some standard books are:
Chilès, J. & Delfiner, P. Geostatistics: Modeling Spatial Uncertainty
John Wiley & Sons, New York, 1999
Christensen, R. Plane Answers to Complex Questions: T
Ale,
Some remarks between the lines:
Alessandro schreef:
Thanks for All help give me.
I spoke with my professor and now I must do some changes. After
subtract the column Z with clomun DEM_SGRD to obtain column H. I wish
to create a new shape with only this H column. I tried and tried but
w
Hi Jan,
Even simpler, once you have a SpatialPolygons object you can use
spsample() to make a grid in that polygon. For reading polygons look at
the rgdal package or readShapePoly() in the maptools package. See
http://spatial.nhh.no/R/etc/world_map_intro.html for a shapefile for the
whole wor
Jan,
If you have the boundaries of Germany and you want to make your own
grid, you can use the overlay method to 'cut' the grid so that you only
get the points inside Germany. You can use this object in gstat to make
your predictions.
Hope this helps,
Virgilio
El mar, 24-02-2009 a las 18:21 +0
Dear list,
The stratified random sampling problem that I submitted a few days ago has
already been solved, with the help of several of you, notably Edzer Pebesma.
Edzer came up with the following solution:
library(sp)
library(rgdal)
nc1 <- readShapePoly(system.file("shapes/sids.shp",package="
Hello
im doing a project with Interpolating ( Kriging ) Temperature Data from many
Stations in Germany. To do a Kriging i have to use a Grid. So I have now 2
options. The better one is too download a prepared grid with the borders of
Germany. Then the interpolated map will look great, because i hav
Dear all,
I'm trying to estimate the variance of a global abundance estimation computed
by kriging interpolation and I am stuck.
One can easily retrieve the variance at each prediction location (either using
the package gstat, geoR or automap) using expressions similar to:
>kriging_object$kri
indeed, on the example file, this works fine.
library(foreign)
data <- read.dbf('theme1.dbf')
data$AminB <- data$A - data$B
file.remove('theme1.dbf')
write.dbf(data, 'theme1.dbf')
if the dbf is too large you could you use a database to import the
dbf, add the column, export again. Perhaps sqlite
Hi,
This should work:
my_SPDF <- readShapeSpatial("theme1.shp")
my_s...@data$ab<-my_s...@data$a-my_spdf@data$B
writeSpatialShape(my_SPDF, "mynewfile")
Cheers,
Jonathan Maynard
On Tue, Feb 24, 2009 at 6:37 AM, Alexander Brenning
wrote:
> Hi there,
>
> to throw in two more alternatives, there
Faye Anderson wrote:
> Hi All,
> I think sgeostat function fit.variogram does it.
>
No, it does not quantify the correlations between variogram estimates,
so you'd better forget about the "Generalized" -- just look at the
output of variogram() that it reads; also the reweighting is only used
w
Hi there,
to throw in two more alternatives, there are functions read.dbf and
write.dbf in packages shapefiles and foreign (see help files for
examples; the functions differ between the two packages despite having
the same name).
Remember that operations on the shapefile attributes only affe
Hi All,
I think sgeostat function fit.variogram does it.
Thanks.
Faye
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Dear Prof. Bivand
Tank for help
I tried this cose
library(rgdal)
canopy_height <- readOGR(".", "theme1")
canopy_height$ZDem.sgrd <- canopy_height$Z - canopy_height$Dem.sgrd
writeOGR(canopy_height, ".", "canopy_height", driver="ESRI Shapefile")
because maptool go out of memory, with rgdal the t
> "RB" == Roger Bivand
> on Fri, 20 Feb 2009 09:55:52 +0100 (CET) writes:
RB> On Wed, 18 Feb 2009, Greg Snow wrote:
>> There is a shapefile (works well with maptools and sp packages) with a
>> world map and time zone information at:
>> http://openmap.bbn.com/data/sha
On Tue, 24 Feb 2009, Alessandro wrote:
Dear Researcher,
I have a shapefile with two columns "a" and "b" and I wish to subtract a-b
to obtain a new column of difference. I tried in SAGA + R with the module
"Table calculator for shapes". This worked without an error, but it didn't
save the res
Dear Researcher,
I have a shapefile with two columns "a" and "b" and I wish to subtract a-b
to obtain a new column of difference. I tried in SAGA + R with the module
"Table calculator for shapes". This worked without an error, but it didn't
save the results either. I suspect that this is a bug
Dear all,
Im my opinion it makes sense to use repeated k-fold cross validation. The
distribution of the statistics yields their confidence intervals.
I will try that during the next few months on a dataset with about 2500 data
points. The current plan is to repeat 1000 times a 10-fold cross val
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