These are just comments, if you have any ideas on how to catch a few more errors let me know.
I've just been playing with the duplicate building tool and picked up over a hundred buildings than had been mapped by a new mapper who made just four edits. I don't think they completed any tiles. As I work through a couple of projects I'm currently validating I'm finding the experience level of the mapper who marked the tile done doesn't correlate that well with the number of errors. I think one new mapper marked half a dozen tiles done. There were all spot on but the mapper hadn't actually done any mapping on them. One new mapper is playing games. In one section of the project which is practically just forest they are subdividing the tiles so they get credited with 16 tiles rather than one. None of which have much mapping on them. They are up to 75 tiles completed by now rather than 5 tiles and have validated two tiles on the project using iD. I'd love to know which these were to double check them in TM3. In TM2 if I was fast enough I could pick them up quite easily. A number of "intermediate" or "advanced" mappers have untagged ways etc on their tiles left over from previous mappers. Just idle thoughts if anyone has a magic wand let me know. Thanks John
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