A quick look at the number of mappers that have contributed to Ottawa there are a lot of individuals and that excludes the GeoBase import. At least some do not live in the Ottawa area, but that also does not preclude their visiting and adding to the map, and I am not sure the tools that they used but at least with some of the names I fully trust their capacity for high quality work. There is very little that was done with the GeoBase import in the area that I was looking at.
>From January 01, 2009, which is after the GeoBase import started in Canada but long before the Ottawa area was done, there have been 24 individual mappers that have contributed to the map in and around central Ottawa. Of those people 15 people have made contributions since June 01, 2009. Even since September 01, 2009 8 people have contributed to the map. Looking further at those that have contributed at least something since January 01, 2009, and this data is for their total contributions, there are some that have contributed little, even as little as a single node or way, while others have contributed a great deal, one person has over 620 ways and points contributed. Wiping out the work of all of these people is going to destroy a great deal of work that was done for the map. The source of the data was from ITOWorld http://itoworld.com and select the area you want to look at. You are going to have to set up an account with the site but they offer an excellent summary of work done by mappers throughout the world in a number of forms. Richard
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