measuring the angle between intersecting lines: Does anyone know of any
helpful tools/methods in R for measuring the angle between two intersecting
lines in a map or an equation that would do so with the start and end
latitudes and longitudes of the two lines? Or give directions of lines?
Thanks,
I basically have to reclass() all 72 tiles, then aggregate() them
from 30 arc seconds to 5 minutes and eventually put them in a brick
with other rasters
so I can average across the layers.
I thought unionExtent() was going to be the ticket, but that just
effects the extent.
On 10/16/2011 02:10 PM, zhijie zhang wrote:
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
spatstat::nndist?
2011/10/17 Paul Hiemstra paul.hiems...@knmi.nl
On 10/15/2011 02:57 PM, Sandeep Patil wrote:
Hello all
I have about 4500 spatial points which are irregularly spaced...
What is want to do is to replace points that are clustered very near
each other by one point
On 10/16/11, Hodgess, Erin, wrote:
Dear R Sig Geo People:
Here is probably a dumb question, so please forgive me in advance (or
swear, whatever is most appropriate): could someone recommend a good
reference on IDW that has a numeric example, please?
Sure, check out Paul Bolstad's GIS
Believe it or not, the Wikipedia entry has the formula listed. You can
easily try it out yourself. It's such a simple procedure that it can
be done by hand.
http://en.wikipedia.org/wiki/Inverse_distance_weighting
Pete
On 10/16/11, Hodgess, Erin hodge...@uhd.edu wrote:
Dear R Sig Geo People:
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
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
Hi Aurelie,
Try this:
skate.ppp$marks - data.frame(species=skate.ppp$marks, number=skate$number)
HTH,
MArcelino
At 17:41 17/10/2011, GodinA wrote:
Hi all, I have a multitype point patterns
representing 12 different species as
follow: marked planar point pattern: 821
points multitype,
Awesome! Thank you very much MArcelino!
-
Aurelie Cosandey-Godin
Ph.D. Candidate, Department of Biology
Industrial Graduate Fellow, WWF-Canada
Dalhousie University | Biology Dept. |Halifax, NS, Canada
Email: god...@dal.ca | Web: wormlab.biology.dal.ca
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