Neil,
You could also accomplish this using FME, with a
PolygonDissolveFactory. FME *is* a proprietary application, with a
reasonably hefty pricetag. However, you can download a 15 day trial
version from SAFE (http://www.safe.com) and give it a shot. This will
merge together your geometries very quickly, but if this is the only
processing you need to do on your data, and FME license would likely be
overkill.
--Adam
Brock Anderson wrote:
Neil,
I can't say much about OpenEV, but you may be able to use one of the
geometry constructors to group your region polygons together. Perhaps
the "collect" function would do it?
Docs here: http://postgis.refractions.net/docs/ch06.html#id2905042
Brock
Neil Saunders wrote:
Hi Brock,
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... :(
Thanks once again for you input!
Cheers,
Neil
On 1/16/06, Brock Anderson <[EMAIL PROTECTED]> wrote:
Neil,
I tend to use Postgres/PostGIS for this kind of processing.
For example:
Load the data into postgres like this:
shp2pgsql <loader options here> england.shp england_table | psql
Then dump it out again into several shapefiles. Use an SQL statement to
select the regions to include in each file:
pgsql2shp <dumper options here> england_table "select * where ..."
pgsql2shp <dumper options here> england_table "select * where ..."
pgsql2shp <dumper options here> england_table "select * where ..."
Brock
Neil Saunders wrote:
Hi Folks,
I've got a map of England as a shapefile, containing regions for each
county. What I'd like to do is merge selected regions in to a larger
region (E.g Devon, Somerset, Cornwall etc into "Westcountry").
Does any one know a simple (Preferably GUI based) way of achieving
this?
Thanks in advance,
Neil.
--
Adam Quiney
Analyst
Refractions Research Inc.
(250) 383-3022
