Using quite a simple polygon in Geometry Replacer, this transformer
fails to convert to skeleton centerline. In this question example we isolated
only 1 polygon that makes the centerline replacer to crash as an example; it’s
something we have observed over time with different datasets, etc..

 

 

The question is - why
does centerline replacer using skeleton option fails even if this geometry from
shapefile seems rather simple?

 

 

Tested FME 2014 SP and FME 2015 SP1. The centerline replacer
failure using skeleton option was there in previous versions also.

 

 

In the example we are sending, we identified 1 coordinate
that seems to be offending the polygon and causing this crash. We isolate this
coordinate, and by moving it very little, the centerline skeleton already
works, still, it was not a coordinate that was near or on top of another etc.

 

 

Attached you will find the polygon (1 polygon only) and the
WS with some tests.

 

 

Assumptions:

 

 

• -We do
  know that using generalizer helps to
  prevent crashes using Centerline Replacer, but we don’t want to generalize as
  we want to maintain this exact polygon coordinates to maintain topology to
  neighboring polys; Being already a simple poly we don’t want to generalize
  further;

• -Tested for duplicate coordinates and there are
  no duplicate coordinates on the polygon boundary.

 

Restating the question, why does centerline replacer using
skeleton option fails even if this geometry from shapefile seems rather simple?
By trying to understand why this 1 polygon fails, might help to modify the
skeleton replacer and prevent more features to crash.

 

 

Thanks in advance,

 

Ricardo

 

 

PS: Topics in not directly related - CenterLineReplacer not available as a Topic