Merging Regions of a shapefile

[Neil Saunders]

Lots of interesting ideas that I wasn't aware of - Thank you everybody
for your input; I'll let you know how it goes!

On 1/18/06, Schuyler Erle <schuyler at nocat.net> wrote:
> * On 16-Jan-2006 at 12:40PM PST, Neil Saunders said:
> >
> > Thanks for your reply; However I've tried using PostGIS but could't
> > get the shapes to actually "merge" together. Ideally what I'd like to
> > do is have a tool such as OpenEV in to which I could load my
> > shapefile, select a given number of *adjacent* regions, and merge
> > selected regions to a single region, if you catch my drift. I'm
> > beginning to think that it may not be possible... :(
>
> You can totally do this in GRASS, if you have the patience to learn
> GRASS. We describe how in hack #77 from Mapping Hacks
> (http://www.mappinghacks.com/).
>
> If you have a recent PostGIS built with a recent GEOS, you might try
> the BuildArea() function from GEOS:
>
>    http://postgis.refractions.net/docs/ch06.html#BuildArea
>
> SDE
>