How to match isochrones with their related points?

[nils]

See here:

Identification of isochrone

Ok, but that’s a user failure there;) But I guess I should catch the error when people just hit OK without specifying what they want to calculate. Although it’s fairly descriptive, considering it’s a Python error message. Happy you could make it work though!

So far, it’s the feature ID, which doesn’t help you a lot. It’s in your isochrone file though. Before you start with 1500 isochrones again, use the field calculator to get a field with ID of your original (assuming you didn’t do ANY geoprocessing on that layer ever since, bcs that can alter the feature IDs) and join the isochrones FTID field on that: