Question
Centroid inside a polygon
In DGN file , How can i identify a centroid , multiple centroids inside a polygon, also please let me know how to give centroid attribute for a polygon .
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Hi,
to get a centroid for a polygon with FME, have a look at the InsidePointReplacer, CenterPointReplacer or the CenterOfGravityReplacer.
David
David,
Thanks,
- I also need to check the number of centroids inside a polygon
- I also need to know how to give same attribute for centroid and the polygon having
- If different centroid have different attributes how can we check this.
Hi,
to check for points inside a polygon, look at the PointOnAreaOverlayer and the SpatialFilter. Use the Group By attribute to match points and polygons with eachother.
To check for differences between objects, use the Matcher.
David
+22- Contributor
The CoordinateExtractor will allow you to tag a feature with the X and Y coordinates of the centroid.
I think from your question though you maybe looking to do point - in - polygon analysis. If so then use the PointOnAreaOverlayer, this tool will allow you to identify how many points fall inside a polygon and also allow you to join all your point features attributes onto the polygon as a list. You can then use the list transformers to analyse the contents of the list.
I hope that helps.
+59- Safer
Yes, use the PointOnAreaOverlayer transformer.
- The _overlaps attribute will tell you how many centroids the polygon has
- Attributes will be copied to/from the points and polygons
- Perhaps use a Matcher to check for centroids that are in the same polygon (get the same polygon ID perhaps?) but do not have the same attributes