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Question

from polygon to multipolygon


simeon.simic
Contributor
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Hello everyone,

I need help with polygons and multipolygons with my geometry, i read shape file if that is important
1. Which transformer should i use, or how can i see if my geometry is polygon or multipolyon ?
2. How can i change type from polygon to multipolygon, what should i use for that change?

3 replies

takashi
Influencer
  • April 28, 2025

Hi ​@simeon.simic ,

You can use AggregateFilter or GeometryFilter to determine if the geometry is Area or MultiArea, and use Aggregator to change Area to MultiArea.


simeon.simic
Contributor
Forum|alt.badge.img+2
  • Author
  • Contributor
  • April 28, 2025

Hi ​@takashi ,

Can you please tell me what parameters should i use in aggregator 

I connect geometry filter first, and i get Area, so what should i do next?

Thank you in advanced 


takashi
Influencer
  • April 28, 2025

Check Group Processing, then

  • Group By : <select unique ID attribute>
  • Complete Groups : When Group Changes (Advanced)

If the input features don't have unique ID attribute, consider add sequential number attribute as temporary ID by inserting Counter before Aggregator.

Note: If you use GeometryFilter to separate Area and MultiArea, set "Detail" to the Mode parameter and "IFMEArea" the Output Port parameter.


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