Dear r-sig-geoers,
I want to randomly sample n points from regions of a raster layers,
the cells denoted as NA is not
included in this sampling process. And, I want to got the longitude
and latitude of the sampled points.
I checked the manual of raster package, I found several functions is
Dear Mao,
You can use function rpoint from spatstat, after converting your
raster object into a pixel image.
consider the following:
library(raster)
library(spatstat)
library(maptools)
library(sp)
# An arbitrary raster
r - raster(system.file(external/test.grd, package=raster))
# plot it
] how to do randomly sampling in raster layer
To: Mao Jianfeng jianfeng@gmail.com
Cc: r-sig-geo@stat.math.ethz.ch
Date: Tuesday, 3 August, 2010, 11:15
Dear Mao,
You can use function rpoint from spatstat, after converting your
raster object into a pixel image.
consider the following:
library
On 08/03/2010 11:15 AM, caspar hallmann wrote:
Dear Mao,
You can use function rpoint from spatstat, after converting your
raster object into a pixel image.
consider the following:
library(raster)
library(spatstat)
library(maptools)
library(sp)
# An arbitrary raster
r-
Dear Mao,
If r is a RasterLayer, you can also do
library(dismo)
xy - randomPoints(r, n=100)
plot(r)
points(xy)
Best, Robert
On Tue, Aug 3, 2010 at 2:51 AM, Paul Hiemstra p.hiems...@geo.uu.nl wrote:
On 08/03/2010 11:15 AM, caspar hallmann wrote:
Dear Mao,
You can use function rpoint
