I'm not a great person for maperthons, the last one I attended could have gone a little smoother, there was a time delay before mapping. They were mapping buildings and highways and although they were mapping for some time no tiles were completed.
Recently there was another one locally which I drifted down to and I did the patter. I took two laptops with JOSM preinstalled and set them up. As new mappers came in I just asked them to sit down at the laptops and start mapping with the building tool. Then we set up their laptops with JOSM and they continued on their own machines installing JOSM, I think one needed to download JAVA and I had JOSM an a DVD. They then continued mapping. We had them mapping their first building within minutes. The big delay was setting up an OSM account and logging into the task manager. 12-15 people registered we had six mappers eventually, four were new to JOSM. They mapped buildings quite quickly and I guarantee all were square, all were correctly tagged and none were more than six inches out of place. Most were spot on in Bing. Tiles were completed and not just ones without buildings in them we deliberately pointed them to tiles that had a fair number of buildings in them. As they mapped they became more adventurous in drawing two squares on an L shaped building and joining them together. We knew that one section was a caravan park so the mapper explored the tags and found building=static_caravan and was delighted to find they could select all the static_caravans and retag them all at once. One new mapper was a teacher so since we had a very experienced iD mapper there after she had been mapping in JOSM for a period of time I got him to show her how to map in iD. Her comment was not so complex to set up in that you didn't need to start JOSM first but per building it was more mouse clicks involved and more to remember. I don't know if the group of mappers we had was small enough we could give them a bit more one on one or they were just exceptionally good new mappers. They all had Windows machines to work on. I do know that Jo has had some similar results going directly to JOSM for new mappers. It does look as if going JOSM and the building_tool plugin is a viable route for new mappers mapping buildings in maperthons. Both the quantity per mapper and the data quality of the mapped buildings was high. Cheerio John
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