Hello,
I'm performing an empirical orthogonal function analysis on sea level
pressure using the spacetime package, and I'm having trouble determining
which elements of the function output I should use to interpret the results.
It seems that most examples in the literature calculate empirical
orth
I have a question regarding kernel density estimation in R. I have a
5-dimensional data, which consists of (x,y,z) locations, time of happening and
size of some events (for example earthquake). I wrote the following code in R
in order to find the 5D kernel density estimation:
library(ks)
libra
Alessandra,
This is pretty straightforward but you need to do your part (show us
what you have done) using a simple reproducible example. For example,
you can use the North Carolina data that comes with spdep. That
package also allows you to identify neighbors.
library(spdep)
library(raster)
nc
I should add that you can use geosphere::midPoint if you wanted the
great circle (longitude/latitude) mid-point instead of the Cartesian
midpoint.
But I now also see that you did not ask for splitting into
pre-existing segments, but into new ones Edzer's solution seems
appropriate for that...
I think the below is a solution:
library(raster)
# create some lines
cds1 <- rbind(c(-180,-20), c(-140,55), c(10, 0), c(-140,-60))
cds2 <- rbind(c(-10,0), c(140,60), c(160,0), c(140,-55))
cds3 <- rbind(c(-125,0), c(0,60), c(40,5), c(15,-45))
lns <- SpatialLines(list(Lines(list(Line(cds1)), "1"),
sp::spsample also offers regular sampling of points on SpatialLines objects.
On 10/23/2014 05:21 PM, Mathieu Basille wrote:
> May be a little bit far fetched, but maybe check 'redisltraj' from the
> adehabitatLT package (and section 4.2.2 of the vignette [1]). Note that
> it was intended for anima
May be a little bit far fetched, but maybe check 'redisltraj' from the
adehabitatLT package (and section 4.2.2 of the vignette [1]). Note that it
was intended for animal trajectories so might be a little bit out of scope
for you.
Mathieu.
[1]
http://cran.r-project.org/web/packages/adehabita
Hi,
With spatstat, you can find the mid point of line segments
http://lojze.lugos.si/~darja/software/r/library/spatstat/html/midpoints.psp.html
But I don't know any package that would split your line into equal segments.
One method would be to arrange equally spaced points along your line with
s
Dear list members,
How to segment or split a spatial line in shorter equal segments, and also,
how to get the mid point of ecah segment.
Best,
Manuel
--
*Manuel Spínola, Ph.D.*
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
CO
hi, i'm trying to map new york city and wondering if it's possible to pick
a projection that will have an effect that brings the map a bit closer to
the shapes seen in the nyc mta subway map (
http://i.stack.imgur.com/YT50F.jpg).
the bonne and azimuthal projections on this page (
https://en.wikip
Dear all,
I am trying to compute the average distance between centroids and between
neighbors, starting from a spatial polygon shape file.
What I am doing is compute the average distance between all centroids and
compute the average distance between neighbors for different regions in order
to b
Hi,
> Works great Frede. Didn’t think that xyplot could just be overlaid
> like this on a raster stack. Got carried away by the example Oscar has
> in the rasterVis tutorial, where "sp. points" is used within a layer.
With the latticeExtra::+.trellis function you can overlay trellis
objects. You
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