Hi Eliza
I think this comes close to what you want (escaping manual work).
library(maps)
library(sp) ## has a point.in.polygon function
ireland - map(world, ireland)
map.axes()
xr - range(ireland$x, na.rm = TRUE)
yr - range(ireland$y, na.rm = TRUE)
xseq - seq(xr[1], xr[2], by = 0.1)
yseq -
Hi guys
Just to follow up on Ted's comments.
See http://erich.realtimerendering.com/ptinpoly/ for other points in polygon
algorithms. Eric Haines has made some performance evaluation of the methods. I
quote here Eric:
The worst algorithm in the world for testing points is the angle summation
Dear Frede and Ted,
What an absolutely crackerjack for somebody who was begging for such a
solution. It worked and worked awfully well.
I am grateful!
Eliza
From: fr...@vestas.com
To: eliza_bo...@hotmail.com; r-help@r-project.org
Date: Mon, 24 Mar 2014 08:09:26 +0100
Subject: RE: [R] points
On 24/03/14 20:09, Frede Aakmann Tøgersen wrote:
:
## get ireland map as polygon, only for main island
## map.poly not exported so use maps:::map.poly
## use exact to leave out Achill Island and only get main island
ie.polygon - maps:::map.poly(world, Ireland, exact = TRUE, as.polygon =
Thanks ray, I really appreciate your concern.
Eliza
Date: Tue, 25 Mar 2014 08:35:15 +1300
From: ray.brownr...@ecs.vuw.ac.nz
To: fr...@vestas.com; eliza_bo...@hotmail.com; r-help@r-project.org
Subject: Re: [R] points with-in boundaries of a map
On 24/03/14 20:09, Frede Aakmann Tøgersen
Thankyou very much jim. it worked! but regarding second part of my question,
isn't there a way to read the coordinates of intersecting lines with the
premises of the map?thanks,
Eliza
Date: Sun, 23 Mar 2014 14:19:43 +1100
From: j...@bitwrit.com.au
To: eliza_bo...@hotmail.com
CC:
On 03/23/2014 10:29 PM, eliza botto wrote:
Thankyou very much jim. it worked! but regarding second part of my
question, isn't there a way to read the coordinates of intersecting
lines with the premises of the map?
Hi Eliza,
I think you want the locator function, which will return the
Thankyou very much. I actually knew abt this command, I just wanted to have a
more direct command instead of manual.But anyway, thankyou very much
indeed.:DEliza
Date: Mon, 24 Mar 2014 09:50:50 +1100
From: j...@bitwrit.com.au
To: eliza_bo...@hotmail.com
CC: r-help@r-project.org
Subject:
On 23-Mar-2014 22:50:50 Jim Lemon wrote:
On 03/23/2014 10:29 PM, eliza botto wrote:
Thankyou very much jim. it worked! but regarding second part of my
question, isn't there a way to read the coordinates of intersecting
lines with the premises of the map?
Hi Eliza,
I think you want the
Dear UseRs,
I have a question regarding reading the coordinates within a country' map. I
drew map of ireland by using the following commands
library(maps)
library(mapproj)
map(world, ireland)
map.axes()
You can clearly see the axis labelled. What is want to do is to draw lines
(both vertically
On 03/23/2014 01:01 PM, eliza botto wrote:
Dear UseRs,
I have a question regarding reading the coordinates within a country' map. I
drew map of ireland by using the following commands
library(maps)
library(mapproj)
map(world, ireland)
map.axes()
You can clearly see the axis labelled. What is
11 matches
Mail list logo