The CRCCalculator creates a unique ID for a feature based on its geometry and/or attributes. CRC stands for Cyclic Redundancy Check. This is particularly useful if the dataset has a "natural key" - http://en.wikipedia.org/wiki/Natural_key. Natural keys are created from a list of attribute names and their values for a particular data record or feature. These can be cumbersome to work with in an FME workflow (i.e. FeatureMerger) so combinging the natural key into a single CRC unique ID can simplify the workspace.
The attached workspace(CRCCalculator Example.zip) shows an example use of the CRCCalculator transformer.
Creating a Unique identifier using CRCCalculator
Article Number: 000001412 - Last Modified: Aug 3, 2011
CRCCalculator can be used to create unique IDs based on a natural key or a combination of feature attributes and feature geometry