On 1/4/23 09:50, Graeme Fitzpatrick wrote:
Don't know if this helps. or makes it worse!
More data = good.
The fact that the data is confusing, to me, simply means that a simple
assumptions of using the high tide as the boundary for all is a problem.
Had a thought so looked at Gold Coast Council's online city plan,
where I know that a National Park touches the shore:
https://cityplan.goldcoast.qld.gov.au/eplan/property/41NPW429/0/184?_t=property
compared to what we have
https://www.openstreetmap.org/edit#map=18/-28.09018/153.45895
Darker green on Council map is NP, bright green is Council Public Open
Space, patch of ocean is Council "ground", which we show as being
within the Admin Boundary of Gold Coast City based on PSMA Admin
Boundaries, but which is also "outside" the Australian "coastline"?
Other spots on the GC show similar, in that there is a discrepancy, &
often an overlap, between Council & State boundaries.
Umm State seaward boundaries should be 3 nautical miles seaward from the
'coastline' (~5.5 km). I forget if that 'coastline' used is high or low
tidal stuff.
You should be able to see the OSM state boundary here
https://www.openstreetmap.org/relation/13056696#map=13/-28.0814/153.5054
Council boundaries should be a lot closer to the coast(which ever one
you chose)?
On Fri, 31 Mar 2023 at 18:14, Warin <61sundow...@gmail.com> wrote:
On 29/3/23 14:30, Andrew Harvey wrote:
On Wed, 29 Mar 2023 at 14:05, OSM via Talk-au
<talk-au@openstreetmap.org> wrote:
Since the coastline tag is also supposed to represent the
high water mark then I would say that they should be snapped
together (since they then represent the same feature - that
is, the high water mark). This would mean that the boundary
data already in OSM from the government basemaps would just
be their own mapping of the high water mark, and probably be
less up to date or refined as our own.
Exactly. So if anything we should be actively snapping them.
Are there any links to these boundaries linked to the high water
mark???
I would have though that CAPAD data would be accurate as it should
come from the National Parks people using the gazette.
My trove searches only turned up low water mark stuff - but I only
looked in NSW.
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