Re: [R] nndist R vs. ArcGIS

2011-04-12 Thread smoluka
The problem was on the ArcGIS 10 end. The program corrupted my layers. I re-created the layer and now I get the same answer. Thank you all for your insight. Alexis PS, the scale is in terms of owl territories and therefore 1.3 km is really huge. -- View this message in context: http://r

Re: [R] nndist R vs. ArcGIS

2011-04-11 Thread Rolf Turner
On 12/04/11 07:32, Barry Rowlingson wrote: On Mon, Apr 11, 2011 at 4:49 PM, smoluka wrote: Can anyone tell me why I would get different average nearest neighbor values for the same set of coordinates between ArcGIS 10 and R? Sometimes the difference in distance is over 1.3 km. Edge correctio

Re: [R] nndist R vs. ArcGIS

2011-04-11 Thread Barry Rowlingson
On Mon, Apr 11, 2011 at 4:49 PM, smoluka wrote: > Can anyone tell me why I would get different average nearest neighbor values > for the same set of coordinates between ArcGIS 10 and R? Sometimes the > difference in distance is over 1.3 km. Edge correction? In a spatial point pattern, points nea

Re: [R] nndist R vs. ArcGIS

2011-04-11 Thread Seeliger . Curt
Alexis wrote: > Can anyone tell me why I would get different average nearest neighbor values > for the same set of coordinates between ArcGIS 10 and R? Sometimes the > difference in distance is over 1.3 km. spatstat::nndist calculates Euclidean distances rather than distances along the earth's s

[R] nndist R vs. ArcGIS

2011-04-11 Thread smoluka
Can anyone tell me why I would get different average nearest neighbor values for the same set of coordinates between ArcGIS 10 and R? Sometimes the difference in distance is over 1.3 km. Alexis -- View this message in context: http://r.789695.n4.nabble.com/nndist-R-vs-ArcGIS-tp3442375p3442375.