Subsequent to Roger's suggestion I will shortly be sending a link to a
site where the shapefile
in question and it's various extensions can be downloaded as a zip file.
Any and all assistance with this problem are greatly appreciated.

Tyler

On Sat, Mar 28, 2009 at 8:04 AM, Roger Bivand <Roger.Bivand@nhh.no> wrote:

> On Fri, 27 Mar 2009, Tyler Dean Rudolph wrote:
>
> I have no trouble importing a subset of a road network for my study area as
>> a shapefile into R, but when I try to import the complete network (area
>> equivalent to approximately 30,000 km^2), I get the following error
>> message
>> (even when I split up the two class formats into two separate commands):
>>
>> fullroads<-as(as(readShapeLines(fn="D:\\GIS\\roadnet.shp"),
>>>
>> "SpatialLines"), "psp")
>> *Error in function (classes, fdef, mtable)  :
>>  unable to find an inherited method for function "coordinates", for
>> signature "numeric"*
>> **
>> Is this due to the memory limitations of R, or to those of my particular
>> machine, or to something else I'm missing?
>>
>
> It may be the file, it isn't memory (the error message would say so), and
> it is unlikely to be your machine. Please provide sessionInfo() and
> traceback() from immediately after the error. If the files in question can
> be made available as a zip archive on a website, this may allow others to
> try to debug the problem. We saw something like this with odd polygon
> geometries recently, but not with lines.
>
> Roger
>
>  The processes I am trying to
>> model are happening at very "large" spatial scales and it would be a great
>> deal more efficient if I could use the entire road network rather than
>> dealing with multiple subsets of a greater image.  Importing as an ascii
>> grid is not an option due to subsequent operations using distmap() which
>> are
>> based on the psp format.
>>
>> Tyler
>>
>>        [[alternative HTML version deleted]]
>>
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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@nhh.no
>
>

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