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Hello,

I have a sequence of points along a line. I have to detect change in an attribute (called "framing") of a point from its previous point. The points are sequential. Sequences are stored as an attribute too "sequence". I imagine I can use an AttributeCreator to create a new attribute called "change" and make the value conditional. Problem is, I am not good at RegEx or conditional statements to know what would be useful.

I need to compare the "framing" attribute with only the previous point within the sequence. Not the one ahead.

I have been trying to follow the example in the thread below but no luck.

https://knowledge.safe.com/questions/33705/compare-attributes-from-two-features.html

 

Eg, if there is a way to compute something along these lines:

IF point.framing = point(sequence-1).framing

Then, Change = No.

Any help will be appreciated.

PS: Working with FME 2016.0

Hi @fariyafarhad, FME has the ability to use adjacent features. If your points are sequential, you might be able to compare using this option.

@fariyafarhad, I think that the AttributeCreator or the AttributeManager with the Enable Adjacent Feature Attributes option helps you. Could you please post the screenshot that illustrates relevant parameters setting in your workspace?

Hi @fariyafarhad, FME has the ability to use adjacent features. If your points are sequential, you might be able to compare using this option.

Hello @TiaAtSafe

 

Thank you for your pointer. That definitely help me set up the parameters

 

@fariyafarhad, I think that the AttributeCreator or the AttributeManager with the Enable Adjacent Feature Attributes option helps you. Could you please post the screenshot that illustrates relevant parameters setting in your workspace?

Hello @takashi. I was able to use the AttributeCreator transformer with Adjacent Feature enabled to come up with the solution.

 

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