Hi @zhangchuangxin,

In an AttributeManager or Creator, there is an Advanced: Attribute Value Handling section. In here you can enable Adjacent Feature Attributes and set the Number of Subsequent Features to 1. This way you can use both the current and next feature in your Azimuth calculation - that is, if you can put your calculation into the Arithmetic Editor within this transformer.

There is more information about this under the Configuration>Parameters heading of the help doc: http://docs.safe.com/fme/2018.1/html/FME_Desktop_Documentation/FME_Transformers/Transformers/attributemanager.htm

Note: For this to work make sure features are entering the AttributeManager in the correct order, you can use a Sorter before hand if you are not sure.

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If the IDs are sequential the solution proposed by @hollyatsafe is very fast and efficient. But in case the IDs aren't sequential, the easiest is probably to split the ID into its two parts, e.g. using use the AttributeSplitter on "L", so that "102L63" becomes "102" and "63".

You can then use the FeatureMerger to match the "current" and "next" features.

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Hi david_r and hollyatsafe: Thank you for your input. However, the ID field is way more complicated and looks like below: D904L1

 

D904L3

 

D904L8

 

D904L8A

 

D904L8B

 

D904L9

 

D904L19

 

D904L19A

 

D904L19B

 

D904L19F

 

D904L19S Wabamun South Side 2nd Bay from East

 

and a very complicated business rule has been defined on how to find previous feature. Can you propose an alternative solution?

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