Hi Kumar,
Based on the exchange in the thread Roger referenced I wrote a blog post
summarizing my understanding of these issue of scale and numerical
precision when performing topological operations with rgeos. It doesn't
address your issue directly, however, I think it will be of some value.
o idea why this is the case, but it works!
M
On Tue, Dec 15, 2015 at 2:22 PM, Matt Strimas-Mackey <stri...@zoology.ubc.ca
> wrote:
> Thanks for the suggestions.
>
> Here's what I tried based on what you said:
> par(mar=c(0, 0, 0, 0))
> png('plot.png')
> plot(square, axes = F, lwd
I'm trying to plot simple SpatialPolygons objects using the basic
plot() command from sp and save these as png or svg. For context, this
is part of a rmarkdown report that will eventually go on the web, so
the saving of images will be done automatically via knitr. Since this
involves images, I've
be corrected on that point(?)
>
> Cheers, Mike
>
>
> On Wednesday, December 16, 2015, Matt Strimas-Mackey <
> stri...@zoology.ubc.ca> wrote:
> > I'm trying to plot simple SpatialPolygons objects using the basic
> > plot() command from sp and save these as
.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f
>
> Best wishes,
>
> Roger
>
>
> On Fri, 6 Nov 2015, Matt Strimas-Mackey wrote:
>
>> Thanks for explaining this in such detail! I have a greater
>> appreciation for the importanc
on(pp))
# finally, set_RGEOS_dropSlivers can be used to remove these slivers
# and fix the topology
set_RGEOS_dropSlivers(TRUE)
pp <- rbind(p1, p3, p4, shift_poly(p2, 1e-4, 0))
plot(gUnaryUnion(pp))
set_RGEOS_dropSlivers(FALSE)
On Thu, Nov 5, 2015 at 2:49 AM, Roger Bivand <roger.biv...@nhh.no> wr
rather than have many elements at parallels. The
> Triangle library does not consider these hexagon coordinates to be
> duplicates, so there are two vertical segments between the two bottom polys
> at
>
> points(coordinates(as(as(spoly, "SpatialLines"), "SpatialPoints&q
(hex_union, border='orange', lwd=3, add=T)
On Wed, Nov 4, 2015 at 8:57 AM, Roger Bivand <roger.biv...@nhh.no> wrote:
> On Wed, 4 Nov 2015, Matt Strimas-Mackey wrote:
>
>> Thanks, lots of useful info here. I've never seen the setScale()
>> function; I don't think
I'm working with a regular hexagonal grid stored as SPDF. At some
point I subset this SPDF, then want to combine all adjacent hexagons
together so that each contiguous set of hexagons is a single polygon.
I'm doing this last step using gUnaryUnion (or gUnionCascaded, not
clear what the different
Seems like you may have some other function called mask either defined by
you or in another package loaded after raster. A couple things you could
check:
-just type mask (without quotes) in the console. The first line should
say something like:
standardGeneric for mask defined from package raster
Perhaps the rasterToPoints function is what you're after:
http://www.inside-r.org/packages/cran/raster/docs/rasterToPoints
gDistance(spatialpoints, rasterToPoints(r, fun=function(x) {x == 15}))
On Mon, Jul 6, 2015 at 10:38 AM, Alexandre Lafontaine
a_lafonta...@hotmail.com wrote:
Dear members,
Hi,
I have two shapefiles: one with polygons of plantations and another
with polygons of protected areas. There are multiple types of
plantations and multiple types of parks. I am able to plot both of
these shapefiles on one map with spplot by including the second SPDF
object in the sp.layout
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