[talk-au] Map errors in regional Victoria

[Andrew Loughhead]

My guess is that a cadastral map would show some of the winery tracks as
being road easements, which have not been utilised for roads by the
local council as yet.  As easements the land manager gets to use the
land, but could potentially lose them should the council decide to
construct those roads.  So it would make sense for the land manager to
use those easements where possible for its own tracks, rather than, say,
investing in vines which they could lose with no compensation.

In the Canberra area there are some examples of easements being marked
as existing roads.  Monash Drive is marked on Google [1] for example,
but is unlikely to ever be built.  Local Live [2] shows the same road. 
Presumably both sites have bought the same source data, complete with
free errors!  The vendor of that data has likely based their road data
in part on easements marked on the cadastre, rather than on the real
world. 

Sometimes these easements have a long history. Where my father lives
south of Hobart there are road easements which go straight up hillsides
which are close to being cliffs, and existing roads which needlessly go
straight up steep hills.  Apparently those easements in the cadastre
were drawn up in the UK based on limited or no topographic data, early
in the period of British settlement. 

[1]
http://maps.google.com/maps?f=q&hl=en&geocode=&q=hackett,+ACT,+australia&ie=UTF8&ll=-35.249615,149.163609&spn=0.031192,0.080338&z=14&iwloc=addr&om=1
[2]
http://local.live.com/default.aspx?v=2&cp=-35.254311~149.168115&style=r&lvl=14&tilt=-90&dir=0&alt=-1000&encType=1
<http://local.live.com/default.aspx?v=2&cp=-35.254311%7E149.168115&style=r&lvl=14&tilt=-90&dir=0&alt=-1000&encType=1>

Brett Henderson wrote:
> I performed some random mappings across Victoria while driving to and 
> from Mt Hotham over the weekend.
>
> I was comparing my tracks with those from other sources and came across 
> this peculiarity at Mitchellton Winery near Nagambie.
> http://maps.google.com/maps?f=q&hl=en&geocode=&q=mitchellstown,+australia&ie=UTF8&ll=-36.852153,145.090599&spn=0.046634,0.079479&z=14&om=1
>
> Notice the proliferation of Blunt Streets.  More interesting is the fact 
> that these streets don't actually exist.  If you look at the aerial 
> photographs, they're actually tracks within the winery itself.
>
> The same errors occur on the http://www.street-directory.com.au site.  
> The vicroads.vic.gov.au site doesn't show these roads but it does show a 
> Blunt Street nearby.
>
> I wonder how these errors were introduced.
>
>
>
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