I think we have to accept that maperthon mappers will not map an exact number of tiles.
Whether that is half a tile, two and quarter tiles it doesn’t matter. We still need to catch the errors they make and if they are spread out over a project on tiles that are not marked done they are difficult to find. One very simple improvement is to ask them to map a block, say at the top left hand corner. This makes it much easier for someone with JOSM to slurp the area in, grab a tile then pull in the surrounding area and run JOSM validation on the area. This picks up the crossing ways, the highways that almost meet, the area=yes that have been left without further tags, highways=road and the untagged ways. It’s not perfect validation but it hits some of the major errors that keep the mapping from being useful. Ideally after 30 minutes ask people to upload or save, then grab with JOSM. You’ll need the mappers to write on a bit of paper what their OSM name is to provide feedback but immediate feedback can be helpful to the mapper and for data quality reasons. Even if you don’t have JOSM or know how to use it, it helps a validator or even what I call a heavy mapper who doesn’t think of themselves as a validator but often will come in and complete a partially mapped tile making some corrections as they go. Thoughts? Thanks John
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