Hi Warren, thanks for your feedback. You sent me back to my computer to re-check some numbers. Remember that the 57,828 kms in the blog post only includes OSM highway tags from highway=motorway to highway=tertiary. Other road types, including highway=unclassified, track, residential etc, are not included in the totals. I just ran some Overpass Turbo queries to calculate the total length of other road classes in WA, and this what you get:
OSM ROAD CLASS DISTANCE (km) CUMULATIVE TOTALS Motorway to tertiary 57,828 (as in blog) 57,828 Unclassified 87,195 145,023 Track 77,339 222,362 If you add motorways to tertiary plus unclassified roads in OSM you get 145,023 kms. This is very close to the total length of roads that is not managed by DPAW, as you quoted from the WA Main Roads report: 147,676 km. In fact the difference is only 1.8%. In addition to this, there are 77,339 kms of highway=track in WA in OSM. This vastly exceeds the length of DPAW managed roads (National Parks, Forestry) that you quoted from the WA Main Roads report (38,333 km). (I assume that at least some of these "extra" tracks must be on private property?) It's difficult to compare the numbers any more closely than this, as Main Roads WA and OSM categorise roads in different ways. Thus, the total length of highway=motorway + trunk + primary + secondary + tertiary + track in WA in OSM = 222,362 km. The total length of roads that are and are not managed by DPAW that you quoted from the WA Main Roads report is 186,009 km. So I reckon OpenStreetMap is doing pretty well really, *especially *on unsealed roads. (Plus, about 20,000 kms of residential roads have also been mapped in WA, as well as other road types). Having said all that, I'm sure that extra roads will be added to OSM in WA and the NT, as you suggest. Northern Qld is probably in the same boat. However, the total length of these roads will be very minor compared to what's already been mapped. Anyhow, thanks for keeping me honest, I'm glad I didn't stuff the numbers up that badly! Best wishes Ian :) On Tue, Jun 22, 2021 at 6:54 PM Warren via Talk-au < [email protected]> wrote: > An impressive effort Ian but I think you have underestimated the length > of Roads in WA. > > From Main Roads WA report: > > Road length excluding DPAW managed roads = 147,676 > > DPAW managed Roads (National Parks, Forestry etc) = 38,333 > > Mappers in WA have a long way to go. I suspect a large percentage of > the sealed roads have been mapped on OSM. The remainder are almost all > unsealed. > > The NT may be in a similar position. > > Nonetheless an interesting report. Thanks for sharing. > > Warren > > > > _______________________________________________ > Talk-au mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-au >
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