On 22 June 2012 04:28, Simon Poole <si...@poole.ch> wrote: > Actually in real life the damage to nodes is substantially less ... > more importantly, > 0.53% points (so not quite half of the 1.2%) of the tainted nodes are from > imports, that, should we so wish, could be reimported (on the case of > ABS2006 with better data).
I'm not sure that percentages are useful applied globally and in this way. As you point out, the percentages are skewed by large imports, both tainted and untainted. In the particular case of the ABS2006 data that you mention, all the unmodified imported data has already been removed. The remaining data is all modified in some way. Rivers, roads, coastline, etc, use and change this information. I think it is accurate to say that all the remaining ABS2006 data, when deleted, will be losing some manually created information that can't be directly created from a reimport. Of course, the significance of that information is hard to estimate. The Nile River has many nodes, but infinitely easier to create than a dense mass of inner-city streets with skyscraper obstructed imagery, gps canyons, turn restrictions, one way rules. We have no measure that I've seen which is useful to assess that - but there is no doubt that in several cities it will be very significant. Ian. _______________________________________________ legal-talk mailing list legal-talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/legal-talk