[R-sig-Geo] A question re: tripack / voronoi cell area units

2006-01-05 Thread Rick Reeves
Greetings: I've checked the tripack documentation for an answer to this question: How to determine the units for areas calculated for voronoi mosaic cells (by the cells method) in the tripack package? I assume that they are related to the units of the $x and $y coordinates input to the voro

Re: [R-sig-Geo] Clarification on Neighbours list

2006-01-05 Thread Roger Bivand
On Thu, 5 Jan 2006, Ronnie Babigumira wrote: > Someone has pointed out that my question was not clear. With a clear danger > of sounding really stupid, I will try to clarify > > Say I have a polygon, which I convert to raster format so each cell is n by > n. For some reason I select a set of ce

[R-sig-Geo] Clarification on Neighbours list

2006-01-05 Thread Ronnie Babigumira
Someone has pointed out that my question was not clear. With a clear danger of sounding really stupid, I will try to clarify Say I have a polygon, which I convert to raster format so each cell is n by n. For some reason I select a set of cells and have a neat rectangle such as below. To get a n

[R-sig-Geo] Neighbours list

2006-01-05 Thread Ronnie Babigumira
Hi, I have a raster map in raster format and would like to make a neighbours list. Reading spdeps documentation I sense that cell2nb is what I should use, however, my grid is not regular (my understanding of this that the grid would be a square or rectangle yet my grid is an abstract form of a