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Hello,

 

I've made a workbench that downloads data to Shape automatically once per month from https://geodata.nationaalgeoregister.nl/hwh/eenheden/wms/v1_0?request=getcapabilities&service=wms (WMS).

 

This time I would like to make a workbench that compares the geometry and administrative data from the Shape files with each other (January-February, February-March and so on). I am thinking about doing this with the ChangeDetector transformer, but that's where my idea stops.

 

Could anyone give me advice on this?

 

Many thanks,

Claire

The ChangeDetector is the way to go, you'll have to feed it two datasets (old and new) and based on one or more key attributes and/or geometry it can find the changes. Best advice I can give you really is to just give it a try.

Two parameters to look out for are the Lenient Geometry Matching (whether or not a different vertex order is a change) and Vector Tolerance (to avoid tiny geometry differences due to rounding errors)

The ChageDetector is the transformer you are looking form.

It's easy to set up, has an intuitive Help section.

I would recommend a PathReader, some grouping of you files by month and sending it 2 by 2 to WorkspaceRunner that runs a workspace containing the Readers and ChangeDetector.

But, I recommend using WMF instead of WMS to get your data if you want to compare features geometry.

Rasters are not suited for this comparison.

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