Re: [R] nndist R vs. ArcGIS

From: Barry Rowlingson <b.rowlingson_at_lancaster.ac.uk>
Date: Mon, 11 Apr 2011 20:32:32 +0100

On Mon, Apr 11, 2011 at 4:49 PM, smoluka <smoluka_at_geo.oregonstate.edu> 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 near the boundary of your window are less likely to have a near neighbour because only some of the surrounding space can possibly have points. I think functions in spatstat will correct for this.

Make a simple test example and tell us what functions you are using.

And also try the r-sig-geo mailing list for this sort of thing.

Barry



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