Ian, Thanks very much for doing this exercise.
I agree with all the sentiments already expressed - it's so encouraging to see we bounced back so fast, and so strong, and that all our efforts have made a difference. Everyone in the project should feel very proud of what we achieved. BJ On 25/05/2013, at 9:08 PM, Ian Sergeant <inas66+...@gmail.com> wrote: > I crunched some numbers comparing AU planet extracts from today and prior to > the redaction commencing. Although they were for my personal edification, I > thought I'd share them. > > We have about 70,000 km of additional mapped unclassified and residential > road now than we did before the redaction process - that is an increase in > distance of about 27%. In terms of distance of named roads in this > category, we're about where we were before the redaction in absolute terms. > > Trunk and motorways there is no significant variation. The number of > kilometres of mapped road and named roads in this category is roughly > unchanged. > > In primary, secondary, and tertiary, we've had an increase in mapped distance > of 35,000km, or around 20%. Although we've seen a significant decrease in > the number of secondary roads, and marked increase in the mapped km of > tertiary roads. Our post-redaction remappers have a tendency towards > tertiary roads, it would seem. Our length of named roads in this category is > up in actual kilometres, but down on a relative basis. > > In paths, tracks, footways and cycleways and service roads our mapped > distance is also up, We've seen huge increases in mapped tracks - closing > on double what we had before. > > So, my summary would be that we've probably comprehensively remapped he > motorways and trunk roads across the country. We've got significantly more > tracks, paths and residential/unclassified roads than we had before. There > would seem to be artifacts of extensive aerial remapping, with the lower > percentage overall of named roads, and what I'm thinking could be a > consequent tendency to underrate what passes for a secondary road in > Australia. I'd also attribute greater mapping outside of urban areas to the > more extensive bing imagery coverage, and possibly the focus of the redaction > process on urban areas. > > Of course, this is all quantitative data, not qualitative. Take it for what > it is. My summary is just a guess, and I can't say with any certainty that > the increase in distance isn't just fence posts on the Kimberley! > > Ian. > > > > > > > > > > > > _______________________________________________ > Talk-au mailing list > Talk-au@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-au _______________________________________________ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
