[talk-au] seaward admin boundaries

[Warin]

On 19/1/21 11:45 am, cleary wrote:
> As with other boundaries, I'd prefer to keep administrative boundaries separate from natural features even where they approximate and may once have precisely aligned.  I'd like to see administrative boundaries consistent with the authoritative government source/s while natural features such as rivers, coastline etc. are mapped from satellite imagery.  Even where coastline erodes or changes in other ways, I think the administrative boundaries in OSM should remain unchanged until the relevant government authority redraws them.
>
> In regard to high-water and low-water marks, I defer to others with better knowledge.


Just checked a small sample with the PSMA data and that confirms the DCS Base Map that at least some of theboundaries in NSW are to wards the low tide mark, not th eOSM coastline/hi tide.

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> On Tue, 19 Jan 2021, at 8:35 AM, Warin wrote:
>> Hi,
>>
>> Someone has been working on the hi water coastline and that has mucked
>> up the suburban admin boundaries near Sydney. Looking at the DCS Base
>> Map these boundaries look to be further seaward than the hi water mark
>> .. possibly the low water mark, though I have not investigated this. I
>> have roughly moved these admin boundaries to where I think they are
>> according to the DCS Base Map. Certainly this would stop any further
>> problems with edits to the coastline vs the admin boundaries.
>>
>> Personal view: sorta makes sense that the council should have control
>> out to low water mark so they can police it. And would reduce OSM
>> problems with edits of the coastline.
>>
>> Thoughts on legalities, bad idea etc ... ???
>>
>>
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