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The polygons are spread out across a region for each feature class, so they would need to be multi-part polygons I'm assuming.
ArcMap's ModelBuilder will dissolve these polygons into a single, multi-part feature. How can I get FME to do this same thing? I have reviewed the Dissolver and FeatureMerger transformers without any luck.
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To make a single-part polygon by dissolving areas which touch or overlap each other, use the Dissolver.
To make a multi-part polygon by aggregating areas regardless of spatial relationships, use the Aggregator.
See the help docs to learn more.
Anyway, to perform the transformation for each feature class, try setting a format attribute called "fme_feature_type" (it stores feature class name) to the "Group By" parameter of the transformer. See the "Format Attributes" tab in the reader feature type properties dialog. You can expose the attribute there.
Takashi
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The Feature Types They Are a-Changin’ (http://blog.safe.com/2015/04/fmeevangelist132/)
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