Hiya, thanks for all your additions to Stainton recently, it’s nice to see more detail being added to the map!

As you’re adding a lot of geometry (which is good), there are a couple of things you should probably be aware of to get the  best results:

1. You can make buildings square easily by selecting them then pressing ‘Q’. This helps keep the map tidy.

2. The aerial imagery isn’t actually properly aligned to ground truth. You need to align it before starting to edit — this is why some of the buildings I’ve tidied up after you in Stainton will now look misaligned to you.

Turn on the ‘OSMUK Cadastral Parcels’ overlay in the ‘Background Settings’ panel on the right, then adjust the imagery offset until features are aligned with the blue cadastral parcels lines. This alignment varies across the country, but with the current imagery for Stainton it’s -2.41,-0.76 metres.

Once the imagery is aligned you should be able to trace buildings/walls/etc. and they’re much better aligned with ground truth (i.e. GPS).

Thanks! Let me know if you have any questions :)