Hi, is there a way to convert an ashape object (object class of package
alphahull) into a spatial polygon? I need only the alpha hull object (the
external contour) and not the delaunay triangles. If not, is there a way to
simply create a single spatial polygon from a matrix containing xy
You can create a SpatialPolygons object from a matrix. See help file for
`SpatialPolygons-class` and sp vignette (page 7):
http://cran.r-project.org/web/packages/sp/vignettes/intro_sp.pdf
Cheers,
Roman
On Tue, Sep 3, 2013 at 12:25 PM, Francesco Carotenuto
carotenuto_france...@yahoo.it wrote:
I found a few discussions just by searching terms:
https://stat.ethz.ch/pipermail/r-sig-geo/2012-March/014409.html
http://casoilresource.lawr.ucdavis.edu/drupal/book/export/html/519
On Tue, Sep 3, 2013 at 8:25 PM, Francesco Carotenuto
carotenuto_france...@yahoo.it wrote:
Hi, is there a way
Alpha shapes to polygons: http://rpubs.com/geospacedman/alphasimple
And Michael Sumner already linked to the one I'm using - alpha hull to
polygon shapefile:
https://stat.ethz.ch/pipermail/r-sig-geo/2012-March/014409.html
Nicole K.S. Barker
Ph.D Student / Étudiante au Doctorat
Laval University
Thanks to everyone!
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Thanks for the tip about GDAL. I was checking the outfile with gdalinfo 1.9
and couldn't figure out why it wouldn't show the coordinate system.
I'll check out raster as an alternative to ncdf4.
Dominik Schneider
o 303.735.6296 | c 518.956.3978
On Fri, Aug 30, 2013 at 10:54 PM, Michael Sumner
Dear R-sig-geo users,
I’m using the raster package (mainly the calc function) to calculate new
indices for a large MODIS raster that I am using. The code works perfectly
when run over small rasters (e.g. 100 MB), but I now want to run the process
on a 60 GB raster. My computer has 20 GB of RAM
Hello all,
I am working on mapping the density of calls for service for our police
department in my town. Please excuse me because I'm completely self-teaching
R, so I'm probably pretty inefficient in my programming. Also, this is
probably a simple answer, so I apologize for that, but I hope
yOn Fri, 30 Aug 2013, Roger Bivand wrote:
On Fri, 30 Aug 2013, Paul Bidanset wrote:
Thank you. I'd like to subset into a specific county. Should there be
further partitioning from that level?
No idea. Please re-create your scenario by subsetting georgia and the
coordinates to suit.
Dear All,
I tried to compare the result obtained by fitting the spherical variogram
model using fit.variogram and nls functions. The large difference in the
results is a great concern for me knowing that the two functions use
Weighted Least Squares (WLS) approach for estimating parameters. The
Thank you very much for the example and the clarification. My hold out test
is random. The vector provided by gw.adapt() allows me to see the bandwidth
size for each point. Is there a way to see each regression point's
bandwidth size with the correct format you just showed me?
On Tue, Sep 3,
Dear Colleagues,
Good day!
Anyone had experience replacing map attribute/data frame (i.e. map@data) with
other data frame using loop. I have maps of A,B, and C and I have a data frames
of a1,b1, and c1. How can I replace/merge the data frames them using loop? So
far below is the code that I
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