[R-sig-Geo] Merging shapefiles and csv

Roger Bivand Roger.Bivand at nhh.no
Thu Jul 31 18:51:44 CEST 2014


On Thu, 31 Jul 2014, HallS wrote:

> Hi all,
>
> OK thanks for all your help.  I believe now I have successfully merged the
> two, when I run str(merged_file) it shows all of the correct variables, and
> when I run plot(merged_file), I still get the outline of the correct shape.

Beware that the data from the objects may be jumbled - never use merge, 
always use match() on the row.names vectors of the objects to ensure that 
the key-IDs agree. Jumbled data happens, it is important not to think 
"shapefile" but to think DBMS with the ID key your way of staying sane.

Hope this clarifies,

Roger

>
> Thank you for all your help, I must confess writeOGR doesn't work still, but
> I thought this was required in order to draw a choropleth map and I realise
> now this is not the case and it can be done with just the merged file I
> believe.
>
> Thanks again
>
>
>
> --
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> Sent from the R-sig-geo mailing list archive at Nabble.com.
>
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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no



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