[FORGED] Re: using spatialpolygonsdataframe in ppm (or, converting spatialpolygonsdataframe to pixel image or other object useful in ppm)
Thanks Rolf, it's actually not what I meant and I appreciate the clarification :) - owin is clear in its definition of specific types, but spatstat types generally do allow combinations of domain, discretization, and path-based boundaries. So I hope I'm not wrong about *that*. (I aspire to be more expert on this cross-over topic, still working on it :) Cheers, Mike.
On Sat, 2 Sep 2017 at 20:27 Rolf Turner <r.turner at auckland.ac.nz> wrote:
On 02/09/17 19:00, Michael Sumner wrote: <SNIP>
It's not clear to me if you need polygons in spatstat or a raster owin version of them - admittedly spatstat does allow a combination of the
two, That's not actually true. The spatstat package allows for observation windows (objects of class "owin" which are either polygonal (of type "polygonal") *or* "raster-like" (of type "mask"), consisting of a pixellation of the bounding box with the pixels having the values TRUE or FALSE. There is also type "rectangle" which is conceptually a special case of "polygonal" but has (obviously?) practical advantages when it is applicable. However an "owin" object *cannot* be a combination of polygonal and mask types. <SNIP> cheers, Rolf Turner -- Technical Editor ANZJS Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276 <+64%209-373%207599>
Dr. Michael Sumner Software and Database Engineer Australian Antarctic Division 203 Channel Highway Kingston Tasmania 7050 Australia [[alternative HTML version deleted]]