[R-sig-Geo] convert sp's Spatial Point Data Frame into Splancs data object

[Roger Bivand]

On Tue, 19 Jun 2007, KAM Tin Seong wrote:

> Hi all,
>
> I have a set of point data in sp's Spatial Point Data Frame format and 
> would like to analyse this data using Splancs, can someone advice me how 
> should I go about doing it.  By the way how to define a Splancs poly 
> object.

You asked a related (but incomplete) question a short time ago. It seems 
that you want to make a gridded kernel density object from a possibly 
marked point pattern. Without a redpoducible example (ie. a canned or 
random point pattern with a fixed seed), it is difficult to reply to your 
claim that the output grid is shifted. It would be useful to find out 
whether you are right or not, so before trying splance, please complete 
your work on spatstat. Please attach or make available on a website data 
that demonstrates your problem, and then we can see if it is a grid shift 
or not. The data do not have to be the complete original data, but should 
demonstrate the problem given your code.

If it then turns out that there is a grid shift, it can be attended to. I 
am not online, and cannot view your image attachments.

Roger

>
>
> Dr Kam Tin Seong
> Practice Associate Professor
> School of Information Systems
>
> Singapore Management University
> 80 Stamford Road
> Singapore 178902
> e-mail: tskam at smu.edu.sg <mailto:tskam at smu.edu.sg>
> DID: + 65 6828 0932
>
>
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>
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no