Can anyone suggest a really good changedetector tutorial or documentation? I'm having difficulties understanding the output where a change in attributes and/or geometry is found. I can't tell which attributes changed (before and after) and I'd like to see exactly where the geometry change is instead of only seeing which features have changed. Hope that makes sense. I'm still learning.
Question
Changedetector info
+23- Safer
Hi @jeaner,
If the Help doc for the ChangeDetector is unclear, please let know where it falls short, and we would be happy to improve it.
If you expand the Changed Output section of the ChangeDetector settings and add a list name to the Detailed Change List Name box, the transformer will add a list of all the changes between the Original and Revised features, for both geometry and attributes.
+63
I just (well, yesterday...) recorded a tutorial video on the ChangeDetector, but it's in Dutch 😅
But yeah, as @daveatsafe mentioned, having it create a list of changes will help you track down the attribute changes but for the geometry ones it just lists it as geometry changed, without going into specifics. If you need those specifics, you'd have to build that processing yourself. Exactly what you'd need to do depends on your specific use case. To name an example, if you want to see differences between polygons you could try an AreaOnAreaOverlayer to highlight those differences.
Hi @jeaner,
If the Help doc for the ChangeDetector is unclear, please let know where it falls short, and we would be happy to improve it.
If you expand the Changed Output section of the ChangeDetector settings and add a list name to the Detailed Change List Name box, the transformer will add a list of all the changes between the Original and Revised features, for both geometry and attributes.
Thank you for the reply. I'm sure the documentation is fine. The problem is my ignorance on how to deal with the output. I've found that doing tutorials is helpful so I can see how others might work with it. I think I will revisit the List docs and tutorials--I think I remember there being a really good one for lists. Thank you so much!
I just (well, yesterday...) recorded a tutorial video on the ChangeDetector, but it's in Dutch 😅
But yeah, as @daveatsafe mentioned, having it create a list of changes will help you track down the attribute changes but for the geometry ones it just lists it as geometry changed, without going into specifics. If you need those specifics, you'd have to build that processing yourself. Exactly what you'd need to do depends on your specific use case. To name an example, if you want to see differences between polygons you could try an AreaOnAreaOverlayer to highlight those differences.
Thank you!
+23- Safer
Thank you for the reply. I'm sure the documentation is fine. The problem is my ignorance on how to deal with the output. I've found that doing tutorials is helpful so I can see how others might work with it. I think I will revisit the List docs and tutorials--I think I remember there being a really good one for lists. Thank you so much!
Our documentation is written by people who are very familiar with FME, but this can make it hard to view it from the point of view of a new user. So feedback on where it may not be as useful as we hoped is always welcome
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