[R-sig-Geo] jitter within polygon

[Paul Lantos]

Thanks, Jim. There isn't a way to specify the polygons a priori in order to constrain the jittering?

Paul

-----Original Message-----
From: Baldwin, Jim -FS [mailto:jbaldwin at fs.fed.us] 
Sent: Saturday, January 28, 2017 12:47 AM
To: Paul Lantos <paul.lantos at duke.edu>; r-sig-geo at r-project.org
Subject: RE: jitter within polygon

Sounds like you need a "point-in-polygon" routine to determine if the jittered point is still within the polygon.

R has several such routines.  Here are two:

  pnt.in.poly in the SDMTools package
  point.in.polygon in the sp package

Mathematica has several options, too.

Jim



-----Original Message-----
From: R-sig-Geo [mailto:r-sig-geo-bounces at r-project.org] On Behalf Of Paul Lantos
Sent: Friday, January 27, 2017 9:30 PM
To: r-sig-geo at r-project.org
Subject: [R-sig-Geo] jitter within polygon

I am trying to figure out how to randomly jitter points within an overlying polygon structure.

I can easily jitter the points themselves, but I would like this to be constrained by the boundaries of polygons containing the points.

This isn't for visualization - I can do that easily enough in GIS. I actually need to generate coordinates.

Thanks,
Paul

Paul M. Lantos, MD, MS GIS, FIDSA, FAAP, FACP                       Contact
Departments of Internal Medicine and Pediatrics                           919-684-6355 (Pediatric Infectious Diseases)
    Pediatric Infectious Diseases                                                                919-681-8263 (Hospital Medicine)
    General Internal Medicine                                                                    paul.lantos at duke.edu
Duke University School of Medicine                                                     @PaulLantos
Duke Global Health Institute


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