How about this?
http://r-sig-geo.2731867.n2.nabble.com/
Cheers,
Roman
On Thu, Nov 25, 2010 at 3:52 PM, Brian Oney zenli...@gmail.com wrote:
Hello List,
Sorry if this is just spam.
Maybe I couldn't find it or maybe it doesn't exist. I think it may
reduce traffic and occurrence of already
Thank you Robert, helpful as always. distance function did the trick.
Maybe I should shortly describe my approach to preserve it for posterity.
I have a polygon on a raster (with non-polygon cells set to NA). Using
function raster::distance, I was able to calculate distance for all NA
cells. I
Dear list,
I've been searching around and I continue to do so, but in the mean time I'm
seeking your advice on how to improve my approach.
I'm using raster package and I'm trying to find cells around (let's call it
a buffer) and inside a polygon. These subsetted cells are used for
calculations
I have solved the issue by checking that the number of layers is bigger than
one. It looks to me like stack() has some problems when being fed only one
layer.
x = character vector
list.of.files - lapply(X = list.of.files, FUN = function(x) {
if (length(x) 1) {
Dear Listers,
I have a list (list.of.files) of file names (character vector) with n number
of elements.
List of 9
$ 1: chr [1:5] binned_walker1_1.grd ...
$ 2: chr [1:2] binned_walker2_1.grd ...
$ 3: chr [1:3] binned_walker3_1.grd ...
$ 4: chr [1:6] binned_walker4_1.grd ...
$ 5: chr
Try argument mask. This should make all non-polygon area NA (assuming
that's what you want).
On Sun, Oct 31, 2010 at 2:08 AM, Manuel Spínola mspinol...@gmail.comwrote:
Dear list members,
I am trying to use polygonsToRaster function but I am not sure how to
use it.
I want to convert a
You can easily clip rasters with polygons (or other rasters) via raster
package.
See this recent
threadhttp://r-sig-geo.2731867.n2.nabble.com/Clip-a-raster-td5635474.htmlfor
one example using crop() and polygonsToRaster() functions. Other than
that, the packages has comprehensive vignettes and
Assuming a SpatialPolygons object is named sampling.area, this is how I
extract the coordinates.
sampling.a...@polygons[[1]]@polygons[[...@coords
Use str(sampling.area) to see the structure of the object.
Cheers,
Roman
On Tue, Oct 19, 2010 at 4:50 PM, isabelle boulangeat
Have you tried raster package?
On Sat, Oct 9, 2010 at 1:32 AM, govin...@msu.edu wrote:
Can someone let me know what package and function should be used to read
*.grd files in R? I tried readGDAL, open.ncdf functions already which threw
errors for file format mismatch.
Thank you all,
Recently, Robert kindly added a function to raster package (raster_1.5-14
from RForge) called lineValues. After loading the new package, I am unable
to access (or use) the function. Any ideas what I might be doing wrong?
rst.cln - raster::lineValues(lns = rst.lines, rst.cellnum)
Error:
You are looking for Sweave. This is LaTeX and R combined... sort of. You may
find LyX handy (a GUI for LaTeX).
Cheers,
Roman
On Fri, Oct 1, 2010 at 7:52 PM, Ricardo Rodríguez
ricardorodo...@gmail.comwrote:
hi all, how I can create reports with the results of my R scripts in pdf
format, if
I see nothing wrong with the suggested names, they appear to be valid.
I would like to know how otheres deal with this, but I tend to keep
parameter names short and sweet with very little extra finesse, e.g.
capital letters. I even try to avoid dots (I have them reserved for objects,
whereas
Dear Tomislav,
go for it if you can afford it (moot point if you're using it under academic
license terms).
Or, you can jump through a few hoops and get most of the things that is
provided by RR (especially big data and parallel computing) through other
resources. Have you seen Eclipse + StatET?
I have a function (that is within a function and everything wrapped in a
wrapper function) that uses raster::xyValues. When I run the wrapper
function and try to pass xy arguments as a vector (of 2, as mentioned in the
documentation), I get an error that the buffer argument (I call it
Your df variable should have coordinates in it and in the form of a matrix
or SpatialPoints (from ?SpatialGridDataFrame: points coordinates, either
as numeric matrix or as object of class SpatialPoints-class). Based on the
code you provided, I would guess that you have a few columns to spare, and
Dear List,
I have a list of xy coordinates
origin.point
[[1]]
x y
196 35.65648 4.268407
267 26.97161 -0.921370
[[2]]
x y
2396 25.82682 -34.30095
2485 24.36276 -31.83600
...
and I'm tryig to extract raster cell values within the radius like so:
cell.num
Thank you Michael for taking interest in my problem. Here is the code that
should work. The only difference is that here, for a polygon, I use a square
instead of a circle (no biggie). I suspect gridDistance may have something
to do with the hexagon.
library(raster)
library(sp)
rst - raster(nrow
Interesting. Works for me out of the box.
sessionInfo()
R version 2.11.0 (2010-04-22)
i386-pc-mingw32
locale:
[1] LC_COLLATE=Slovenian_Slovenia.1250 LC_CTYPE=Slovenian_Slovenia.1250
[3] LC_MONETARY=Slovenian_Slovenia.1250 LC_NUMERIC=C
[5] LC_TIME=Slovenian_Slovenia.1250
attached base
Thank you Jacob for pointing out the obvious I missed. Looks like distance()
will do what I want.
r - raster(ncol=36,nrow=36, projs = +proj=NA)
r[] - NA
r[500] - 1
dist - distance(r)
plot(dist)
Michael, compare this output to (notice +proj=NA - see Roberts
comments
Dear List,
I have a raster with a set of different values (about 8 in total) - they are
all discrete values (sort of like factors, really) on a log scale (10, 1,
0.1...). For better visualization, I would like to assign a specific color
to each value. I have tried with the plot argument col =
See package raster.
stack()
brick()
Also some nice vignettes for the package.
Cheers,
Roman
On Tue, Jun 1, 2010 at 3:15 PM, Conde Ovando, Dalia Amor
co...@demogr.mpg.de wrote:
Hi all,
I am working with satellite images LANDSAT, and I am wondering if there is
any way to do a layer
I have found a function (kudos to Barry Rowlingson) on this mailing list
that makes a circle. I have modified it to fit my needs. You can convert the
points into a polygon. You should be able to clip your rectangle with that.
circle - function(x = x, y = y, r = radius, n = n.faces){
t -
I have created a list of RasterLayers and am trying to plot each layer
individually by extracting it from a list. I get the error listed below. I
have tried unlist() but it's not working for some reason. Can anyone suggest
how to make it plot?
plot(list.of.rasters[[1]][1])
Error in xy.coords(x,
Hello,
I have a general question regarding rasters from raster package. What sizes
of rasters are usually employed in analyses? How would you classify a raster
of 1000x1000 pixels, small, average, large, huge...?
Cheers,
Roman
--
In God we trust, all others bring data.
[[alternative
I've tried to plot a few islands off the west coast of Croatia (Yugoslavia
in the dataset) and get a similar result. Perhaps it's the (relative small)
size of these island polygons that is stirring up problems?
Cheers,
Roman
On Tue, Apr 27, 2010 at 6:17 PM, Bin Li b...@lsu.edu wrote:
I am
Thank you Marcelino and Robert for your valuable input. It was helpful.
Marcelino, your solution seems to resolve the issue, however I find Robert's
suggestion easier (more compliant with the existing code I already have).
What I would like to add to the discussion is that I set the projection of
How does this function sound (convexhull.xy {spatstat})?
http://bm2.genes.nig.ac.jp/RGM2/R_current/library/spatstat/man/convexhull.xy.html
Convex Hull of Points Description
Computes the convex hull of a set of points in two dimensions.
Usage
convexhull.xy(x, y=NULL)
Arguments x vector of x
This is the normal behavior (see image
herehttp://imagepaste.nullnetwork.net/viewimage.php?id=837)
when I use option A-ish (calculating distance to a single point).
Intuitively, however, I would expect the plot to look something like
this (crudely
drawn for your
Dear list,
I have a polygon that I converted to raster (kudos to polygonsToRaster()). I
would like to assign values (through a custom function) to cells within this
polygon (now as raster). Roughly speaking, cell value will depend on its
distance from the central cell (polygon centroid). How
# Dear list,
#
# I'm apologizing in advance if my question is rather basic, but I've
# been banging my head against the wall over this all day and the
# seismology department has already contacted me to stop it.
#
# I'm trying to add points (SpatialPointsDataFrame object r) to a
# raster object
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