I didn't know how to do this offhand, but a little research soon found a way.
So I think you need to search the existing resources before asking your
question as my basic search from R
>RSiteSearch("esri grid")
returned write.asciigrid as the first response. Since I routinely read
shapefiles into sp classes (readShapePoints in maptools) it's the conversion of
one to another.
The overview PDF file in the sp package gives an example on converting points
to grids ("5.2 Creating grids from points".)
It would appear that you just need to familarise yourself with what's in sp and
maptools. I would suggest looking through previous posts on this list with
regard to shapefiles which will give you an understanding of some of the
limitations that you might bump into. For example (I don't know if it is still
true) I have some point shapefiles that don't seem to be currently supported.
Tom
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Yong Li
> Sent: Friday, 10 March 2006 7:18 AM
> To: r-sig-geo@stat.math.ethz.ch
> Subject: [R-sig-Geo] Convert esri shape files to esri ascii
> grid from R
>
>
> Hi R spatial experts,
>
> Has anybody done the conversion of esri shape files to esri ascii
> grid based on field values in R?
> I knew it can be done easily in Arcview using avenue. But if it can
> be done in R, that will fly my daily work loads.
>
> Regards
>
> Yong
>
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