On Tue, Jan 26, 2010 at 11:42 AM, Steve Murray <smurray444@hotmail.com>wrote:

>
> Dear all,
>
> Thanks for the replies so far.
>
> Just to emphasise, I'm not using Excel in any way. I have many many files
> to output, so it'd take considerable time to export from R, reprocess in
> Excel, then load into Arc! On a PC I'm able to go directly from R to ArcMap
> (9.3) without having to go via Excel. I've simply been viewing the data in
> Notepad, which was fine for observing the removal of the end-of-line
> characters and general format of the data (3 columns).
>
> My data are structured as follows:
>
> > str(mrunoff)
> 'data.frame':    61538 obs. of  3 variables:
>  $ Latitude : chr  "5.75" "6.25" "6.75" "7.25" ...
>  $ Longitude: Factor w/ 720 levels "0.25","0.75",..: 1 1 1 1 1 1 1 1 1 1
> ...
>  $ Runoff   : num  0.687 2.661 0 0 0 ...
>

what about changing the class from Longitude and Latitude to numeric? This
could probably solve the problem?



>
> I can't use col.names=NA, as I do have column names! These are also
> required by Arc as identifiers. Also, as you can see, there are no
> complications in the variable names which, as you rightly say, can cause
> problems in Arc.
>
> If anyone has any further suggestions regarding how to overcome this
> problem of generating data from R on a Mac for input to ArcGIS on a PC, then
> I'd be very grateful to hear them.
>

In addition, as far as I know, Arc can read dbf and from R, you can export
to dbf, via the package "foreign" - might be worth a try.

Cheers,

Rainer


> Many thanks again,
>
> Steve
>
>
>
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