[OSGeo-Discuss] Command line tool for dissolving polygon boundaries

[Noli Sicad]

Dan,

I am using Spatialite CLI for to this job.

1. Import shapefile into Spatialite
2. Create CSV.file for the counties
3. Use Vitual table for counties.csv
4. Use ST_UNION to create a new table with dissolved boundaries
5. Dump the new spatialite table to Shapefile file

Noli


On 3/2/11, Simon Cropper <scropper at botanicusaustralia.com.au> wrote:
> On 02/03/11 08:37, Dan Putler wrote:
>> All,
>>
>> Is there a FOSS command line tool that runs under Linux for dissolving
>> polygon boundaries based on a field in an attribute table that (ideally)
>> works directly with shapefiles? There are a number of non-cli tools out
>> there, but I'm working with all US counties on a county by county basis,
>> and wanted to avoid importing each individual county into another product.
>>
>> Dan
>> _______________________________________________
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>>
>>
>
> Dan,
>
> My understanding is that SAGA can be accessed using the command line.
> Check out this page...
> http://sourceforge.net/apps/trac/saga-gis/wiki/Executing%20Modules%20with%20SAGA%20CMD
>
> If you intend to create a bash script to dissolve your shapefiles, it
> would be just as easy I presume to write a script that opens the
> shapefile, dissolves the polygons, then closes it; progressively working
> through the list of counties. Remember most packages have the ability to
> run script. gvSIG uses Jpython, QGIS python, etc. I fact from what I can
> tell you can actually import QGIS modules into python.
> http://desktopgisbook.com/Creating_a_Standalone_GIS_Application_1
>
>
>
> --
> Cheers Simon
>
>     Simon Cropper
>     Principal Consultant
>     Botanicus Australia Pty Ltd
>     PO Box 160, Sunshine, VIC
>     W: www.botanicusaustralia.com.au
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