Good day all,

I've only recently been introduced to the useful spatial tools available in R (and indeed to GIS in general!).  I have found reading some of the posts on this mailing list quite useful, so am hoping that someone can help, or else let me know it can't be done!

I have a map in Shapefile format, which I can read into R.  The shapefile is divided into regions.  What I want to do is merge the regions on the shapefile into larger areas.  The link between each of the individual shapefile regions and the larger regions is on a text file of the following format:

Area_ID    Larger_ID
1                    1
2                    1
3                    1
4                    2
5                    2

Is it possible for me to do this in R, without the use of other GIS software?

Thanks in advance for any help that may be provided.

Kind regards
Lyndon


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