The answer I have found is both clear and straightforward:
require(maptools)
IloveR<-as(as(readShapeLines(fn="mylinedata.shp"), "SpatialLines"), "psp")
I was hoping someone might be able to point me in the direction of something
like this but I was fortunate enough to stumble across it in one of
Hi there,
I have a spatial road network for which I would like to construct a
"distance map" as in the distmap() function in the spatstat package.
However this function only seems to readily accept .ppp, .psp, and owin
objects. How can I import my data into a format that can be used to create
a d
The distmap calculation works fine for polygons
imported from shapefiles, thanks Adrian and Roger!
Agus
Roger Bivand escribió:
>
> Doing all the conversions as specified, it does work:
>
> library(maptools)
> library(spatstat)
> load("refG.rda")
#Note, refG comes from:
#refG <-
#readOGR("C:/A
Dear list,
I have 2 raster (im) objects (ai and escenai) which
are identical except by 1 single pixel
at position 356,777:
> ai$v[356,777]
[1] 255
> escenai$v[356,777]
[1] NA
I calculate distmap for both:
refdist <- distmap(as.owin(ai))
adist630 <- distmap(as.owin(escenai))
As the only diffe
Finally, I've given up
using distmap on an object imported
from a shp file. Could not solve the casting
problem from the sp object to the owin object.
I've rasterized the vector prior to importing to R
and this is the way I calculate the distmap and export it.
refG25 <- readGDAL("GFOEOABUFActi25.
On Tue, 26 Jun 2007, Agustin Lobo wrote:
Still some problems:
sessionInfo()
R version 2.5.0 (2007-04-23)
i386-pc-mingw32
locale:
LC_COLLATE=Spanish_Spain.1252;LC_CTYPE=Spanish_Spain.1252;LC_MONETARY=Spanish_Spain.1252;LC_NUMERIC=C;LC_TIME=Spanish_Spain.1252
attached base packages:
[1] "sta
Still some problems:
> sessionInfo()
R version 2.5.0 (2007-04-23)
i386-pc-mingw32
locale:
LC_COLLATE=Spanish_Spain.1252;LC_CTYPE=Spanish_Spain.1252;LC_MONETARY=Spanish_Spain.1252;LC_NUMERIC=C;LC_TIME=Spanish_Spain.1252
attached base packages:
[1] "stats" "graphics" "grDevices" "utils"
On Mon, 25 Jun 2007, Edzer J. Pebesma wrote:
> Roger Bivand wrote:
>> On Mon, 25 Jun 2007, Agustin Lobo wrote:
>>
>> > I've tried (among other things):
>> > > limit1 <- read.shape("limit_PNSN2000.shp")
>> > Shapefile type: Polygon, (5), # of Shapes: 2
>> > > limit1poly <- Map2poly(limit1)
Roger Bivand wrote:
> On Mon, 25 Jun 2007, Agustin Lobo wrote:
>
>> I've tried (among other things):
>>> limit1 <- read.shape("limit_PNSN2000.shp")
>> Shapefile type: Polygon, (5), # of Shapes: 2
>>> limit1poly <- Map2poly(limit1)
>>> limit1owin <- as(limit1poly,"owin")
>> Error in .classEnv(thi
On Mon, 25 Jun 2007, Agustin Lobo wrote:
I've tried (among other things):
limit1 <- read.shape("limit_PNSN2000.shp")
Shapefile type: Polygon, (5), # of Shapes: 2
limit1poly <- Map2poly(limit1)
limit1owin <- as(limit1poly,"owin")
Error in .classEnv(thisClass) : unable to find an environment
I've tried (among other things):
> limit1 <- read.shape("limit_PNSN2000.shp")
Shapefile type: Polygon, (5), # of Shapes: 2
> limit1poly <- Map2poly(limit1)
> limit1owin <- as(limit1poly,"owin")
Error in .classEnv(thisClass) : unable to find an environment containing
class "polylist"
> limit2
On Fri, 22 Jun 2007, Agustin Lobo wrote:
> Dear sig-geos,
>
> I have to calculate a distmap (that is, a map
> in which the value of each cell is the distance
> from the cell to a given object) for a set of polygons.
> It seems to me that distmap.owin in spatstat would do it
> fine, but distmap.owi
Dear sig-geos,
I have to calculate a distmap (that is, a map
in which the value of each cell is the distance
from the cell to a given object) for a set of polygons.
It seems to me that distmap.owin in spatstat would do it
fine, but distmap.owin does not accept objects
imported from shp vectors via
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