[talk-au] JOSM Scanaerial plugin on NSW LPI layers

[Ross]

In Australia all property boundaries are not the centreline of the road 
there is always a road reserve as Andrew pointed out.  So simple do not 
make boundaries the road.

Likewise be very careful assuming the boundary is the centreline of a 
river.  eg the NSW Victoria border along the Murray River.  If you don't 
know it's actually the southern river bank.

Realistically with these boundaries if you move them to align with any 
physical  feature then you are corrupting the data.  Also  if you make 
the boundary part of a physical feature without checking the full length 
of the boundary then you are corrupting the data again.

It's really much cleaner and easier to just import/trace the boundary.  
If this shows up where a road/railway/whatever should be then trace it 
from the imagery as a separate way and tag it appropriately.

Cheers
Ross


On 25/01/16 08:53, Ian Sergeant wrote:
> On 25 January 2016 at 09:29, Andrew Davidson <u887 at internode.on.net 
> <mailto:u887 at internode.on.net>> wrote:
>
>      The boundaries of the parks and forests are not going to be roads
>     as they consist of a number of property lots that get declared for
>     that purpose. Property boundaries don't run down the middle of the
>     road, they'll be offset (at times the existing road isn't within
>     the road reserve anymore).  Property boundaries can be rivers
>     (bank or thalweg depending) or the MHWM (also known as the "coast"
>     in OSM).
>
>
> If OSM was only a colouring-in exercise, then this would be 
> straightforward.
>
> However, roads in OSM are a vector representation of the road.  And is 
> is very common for the boundary of an area to be the road itself, that 
> is there is no small gap between the area and the road.
>
> When the boundary of an area *is* the road, then I think it's entirely 
> correct to include the ways that make up the road in the multi-poly 
> that defines the area. Even though the vector nature of OSM slightly 
> expands features that are 2 dimensional when they are adjacent to 
> features that are 1 dimensional. The data is correct.
>
> Of course, if the boundary isn't defined by the road, but just happens 
> to be close to it, then that's different.
>
> Ian.
>
>
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