[R-sig-Geo] spgrass6 "r.in.wms"

[Roger Bivand]

On Tue, 19 Jul 2011, dman wrote:

> All,
>
> I'm trying to get some .wms info to plug into a process I have developed in
> R.
>
> Has anyone tried to implement "r.in.wms" via R opened within GRASS? Here is
> my swing at it.
> http://r-sig-geo.2731867.n2.nabble.com/file/n6600318/question_to_r-sig_re_wms.txt
> question_to_r-sig_re_wms.txt
>
> the error is around the maxrow, and maxcol not being integers. Is this a
> issue of using "list"? or possibly something else?

Your input:

pars<-list(mapserver="http://wms.jpl.nasa.gov/wms.cgi", format="jpeg",
   maxrows=5, maxcols=5, method="nearest")

is not correct. When GRASS wants an integer, it has to be an integer. The 
command works with:

pars<-list(mapserver="http://wms.jpl.nasa.gov/wms.cgi", format="jpeg",
   maxrows=as.integer(5), maxcols=as.integer(5), method="nearest")

and

pars<-list(mapserver="http://wms.jpl.nasa.gov/wms.cgi", format="jpeg",
   maxrows=5L, maxcols=5L, method="nearest")

where 5L defines an integer constant.

See

is.integer(5)

a numeric constant, and

is.integer(5L)

If you need WMS access directly from R, and if your GDAL is build with WMS 
support, you may also be able to use readGDAL() or similar rgdal functions 
directly.

Hope this helps,

Roger

>
> As per, your august help and guidance is much appreciated.
>
> D
>
>
>
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-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
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