You are right -- google pointed me to the example:
http://www.asdar-book.org/book/vis_mod.R
chunk 31, where the function "krige", without variogram model, results
in idw. To avoid confusing scripts that suggest kriging takes place,
package gstat also provides a function idw, which does the same thing, by
zn.idw <- idw(log(zinc) ~ 1, meuse, meuse.grid)
In addition, package spatstat contains a function called idw, doing idw
interpolation on a marked point pattern. When loading both spatstat and
gstat, this means the order of loading matters.
On 10/17/2011 03:39 PM, giuseppe calamita wrote:
Hi Erin,
did you check the book from Roger Bivand -Edzer Pebesma and Gomez-Rubìo:
Applied spatial data analysis with R?
There is some short explanation of how the algorithm work and just one record
of code.
If you want I think I can send you some line of codes as examples.
Giuseppe
________________________________
Da: "r-sig-geo-requ...@r-project.org"<r-sig-geo-requ...@r-project.org>
A: r-sig-geo@r-project.org
Inviato: Lunedì 17 Ottobre 2011 12:00
Oggetto: R-sig-Geo Digest, Vol 98, Issue 15
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Today's Topics:
1. errors in installing HDF5 package under windows (zhijie zhang)
2. IDW example (Hodgess, Erin)
3. Creating big raster from small tiles (steven mosher)
4. Re: Creating big raster from small tiles (steven mosher)
5. Re: Creating big raster from small tiles (Robert J. Hijmans)
6. Re: Getting the other GIS to recognize files created by
writeRaster() (Robert J. Hijmans)
7. measuring angle or relative direction of 2 lines (Tracey Osborne)
8. Re: Creating big raster from small tiles (steven mosher)
9. Re: errors in installing HDF5 package under windows
(Paul Hiemstra)
10. Re: Delete points within a certain distance of each other
(Paul Hiemstra)
11. Re: Delete points within a certain distance of each other
(Mathieu Rajerison)
12. Re: errors in installing HDF5 package under windows
(Paul Hiemstra)
Dear all,
The HDF5 binary package is not available now, so i download the source
package and unzip it. When i check it before building the package, some
errors appeared, see below. I donot think it's related with the R and HDF5
versions. I guess i missed something here.
--Errors--
* installing *source* package 'hdf5' ...
cygwin warning:
MS-DOS style path detected:
C:/PROGRA~1/R/R-213~1.2/bin/i386/HDF5~1.RCH/hdf5/libs
Preferred POSIX equivalent is:
/cygdrive/c/PROGRA~1/R/R-213~1.2/bin/i386/HDF5~1.RCH/hdf5/libs
CYGWIN environment variable option "nodosfilewarning" turns off this
warning.
Consult the user's guide for more details about POSIX paths:
http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
cp: cannot stat `/cygdrive/d/Backup/my
documents/hdf5-support/cyghdf5-0.dll': No such file or directory
cp: cannot stat `/cygdrive/d/Backup/my documents/hdf5-support/mgwz.dll': No
such file or directory
ERROR: configuration failed for package 'hdf5'
* removing 'C:/PROGRA~1/R/R-213~1.2/bin/i386/HDF5~1.RCH/hdf5'
---------
If anybody have some experiences on reading HDF4 and HDF5 datasets
successfully, please also give me more information on this.
I have searched the R help, and cannot find a solution. Somebody suggest
the rgdal, which seems not to work.
Any suggestions or help are greatly appreciated.
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--
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics e.pebe...@wwu.de
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