Dylan Beaudette wrote:
> Hi,
>
> Here is another approach, using something like a 'concave hull' -- i.e. alpha
> shapes:
>
> http://casoilresource.lawr.ucdavis.edu/drupal/node/919
>
Thanks Dylan and thanks Roman for your advice. (convexhull.xy was what I
wanted).
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Hi,
Here is another approach, using something like a 'concave hull' -- i.e. alpha
shapes:
http://casoilresource.lawr.ucdavis.edu/drupal/node/919
Cheers,
Dylan
On Friday 23 April 2010, Roman Luštrik wrote:
> How does this function sound (convexhull.xy {spatstat})?
>
> http://bm2.genes.nig.ac.jp
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 coo
How to create nice polygons from a number of clusters?
I have sorted list of clusters representing hot-spots
> sorted.list.of.clusters
[1] 7 1 11 9 26 2 5 10 33 40 18 28 37 20 30 47 53
whereas my.cluster holds the classification of events (criminal
fire-setting) to clusters:
head(my.clust
On Thu, 23 Apr 2009, Alina Sheyman wrote:
I went back to the help page, but it still didn't clarify it for me.
Yes, the two files are different length, but both have a zip variable that
they can match on and then keep only those records that match. Or do I need
to additionally create an index fo
I went back to the help page, but it still didn't clarify it for me.
Yes, the two files are different length, but both have a zip variable that
they can match on and then keep only those records that match. Or do I need
to additionally create an index for the match to occur?
I am understanding it t
Hi Alina,
It sounds like you want to dissolve the zips based on their membership in a
district. If I have that right, then try the function unionSpatialPolygons. The
example from the help is below.
Zev
library(sp)
library(gpclib)
nc1 <- readShapePoly(system.file("shapes/sids.shp", package="mapt
On Tue, 21 Apr 2009, Alina Sheyman wrote:
To rephrase my question and explain my problem further
I have already created a map for revenue by zip code, in the state of
Massachusetts. To accomplish that I used a shapefile for Massachusetts and a
dataframe with my revenue/zip codes.
What I am tryi
To rephrase my question and explain my problem further
I have already created a map for revenue by zip code, in the state of
Massachusetts. To accomplish that I used a shapefile for Massachusetts and a
dataframe with my revenue/zip codes.
What I am trying to do now is to have the same map done not
This is a pretty general question, and there are potentially many
ways to do it.
One way to get started would be to follow the example(s) in the help
page for the overlay() function in the sp package.
-Don
At 1:26 PM -0400 4/20/09, Alina Sheyman wrote:
I have a list of made-up districts an
I have a list of made-up districts and corresponding zip codes. Based on
that I want to define my own polygons (for each district) and then use them
to create a map. Does anyone know how I would go about defining these?
thank you
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