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How to iteratively merging rings

  • May 4, 2018
  • 3 replies
  • 19 views
chau
Contributor
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I have a set of polygons resembling the Towers of Hanoi (I have many towers with varying rings but only included one tower here):

I would like to start with the polygons which doesn't have any holes and which are holes in other polygons (in this case I only have the small one in the center) and dissolve it with the polygon in which it is a hole. I would like to repeat this until the dissolved area is larger than some threshold (here 30).

Can I do this in FME 2016?

I have attached a shape file with the data set above.

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3 replies

takashi
Celebrity
  • takashiCelebrity
  • May 4, 2018
The Dissolver can dissolve those rings at once and form a single large polygon. Why do you need iteration?

 

 

Why not inspect features with Visual/Data Preview and Feature/Record Information before writing them into a destination dataset?
chau
Contributor
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  • chauContributor
  • Author
  • Contributor
  • May 4, 2018
The Dissolver can dissolve those rings at once and form a single large polygon. Why do you need iteration?

 

 

I need it because of the combined dissolved area threshold, at least I think I need it.
takashi
Celebrity
  • takashiCelebrity
  • May 4, 2018

Hi @chau, if all the rings are donuts, remove hole from them, calculate area for each, then select one which has the maximum area within the threshold. I think it would be your desired result. This is an implementation example.

Why not inspect features with Visual/Data Preview and Feature/Record Information before writing them into a destination dataset?

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