4 replies to this topic

[spesseh]

Greetings! First post!

I am working with two sets of polygon layers. One is a world_country polygon layer and one is a set of conflict polygons. These conflict polygons (circular polygons from conflict centroid) are covering areas outside its centroid country. That is something i want to remove (the areas outside its country).

So, i need to clip away the areas of the conflict polygons that are outside the conflicts respective country boundaries.

Is there a way of doing this?

Cheers, Andreas.

[Hans van der Maarel]

Hi Andreas, and welcome to Cartotalk!

Yes, it is possible to clip based on country name. The actual method depends on what software you are using though. I know it's possible in FME, not sure about other software.

[spesseh]

Hi Andreas, and welcome to Cartotalk!

Yes, it is possible to clip based on country name. The actual method depends on what software you are using though. I know it's possible in FME, not sure about other software.

Hi, Thanks for your quick reply.

I am using ArcGis 9.2 at the moment, but i cant really find a method to do this without doing lots of time consuming editing. I have clipped the conflict polygon based on the country polygon, but that only removes the areas that are located outside terrestrial areas. Next step would be to clip each conflict polygon based on the country name.
Any suggestion on to how this could be done in arcgis?

Thanks!

[spesseh]

Hans,

I got a evaluation version of the FME program. Could you give me a short explaination on how to perform this clip based on country operatin in FME?

That would be great.

Andreas

[Hans van der Maarel]

Hi Andreas,

I've attached the workbench as a zip file.

 group_by_clipper.zip   6.8K   58 downloads

 group_by_clipper.png   47.8K   49 downloads

Keep in mind that most of the workbench is actually aimed at setting up the sample data. The real trick is in the Clipper. Set it to "Multiple Clippers" and group by the polygon id. Obviously the circles need to have this same id, otherwise it won't work. In your case, that would be country name.

The "Clipped_Inside" visualiser holds the data you're after. In real life, you would link that through to an output dataset.

Hope this helps.