On 3/10/23 19:41, Andrew Davidson wrote:
On 2/10/23 21:53, Little Maps wrote:
As I understand your message, we have and/or can get population data
for a small proportion of places in Aus (probably with comprehensive
data for most larger places and less data for the many smaller ones).
There are two classes of problems:
1. Urban centres that have gown so much that they have coalesced with
neighbouring urban centres. Some of these are easy to assign the
population to a single place node (Gold Coast, Nowra - Bomaderry,
Shepparton - Mooroopna). Others are not clear where you would put the
population (Central Coast, Blue Mountains, Ocean Grove - Barwon
Heads). There are about 90 of these out of 1800.
2. Settlements that are so small that the ABS doesn't consider them
worthy of their own mesh block (the smallest geographic unit they
report on). If a settlement doesn't rate a single residential mesh
block I'd say it's not really a candidate for anything above hamlet.
This means that, if we develop a guideline based primarily on
population data we then have to develop a simple way to extrapolate
the guidelines to places without pop data. Yes?
If you can't get population data that kinda suggests it's either tiny
or, grown so big that you have to start worrying about how to
subdivide the urban area into suburbs etc.
As a simple starting point, I’m curious whether it’s possible to
first try to get agreement on general cut-offs for
villages/towns/cities etc using only the places that have pop data
(i.e. those you’ve mapped). We could present some different scenarios
so that everyone could see the implications of different decisions
for areas that they know.
The ABS uses a threshold of 1000 people in an urban area to identify
an urban centre. In OSM speak this would be a town or city.
At the small end the old Natmap standard was not to show any
settlements smaller than 200. Maybe that's the threshold for
hamlet/village. Although I get the impression people would like to
adjust that for the level of services available. Perhaps we could
apply the Fitzpatrick adjustment:
add on or take off 50 people for each one of the following is or isn't
available:
pub
shop
servo
a government service (PO/Hospital/Police)
So a settlement with pub, shop, servo, and school with a population of
4 would be a village. A rural residential development with no services
and a population of 750 would be a hamlet.
The cutoffs are going to be arbitrary. The important thing is to just
choose some and make sure that there's some reasoning behind them.
The 'government/community services' might be ordered by there total
numbers?
PO (including local PO agents)
Police
Doctors (theses seam scarcer than Police?_
Hospitals
Outliers?
The Ilkurlka Roadhouse is on the Anne Beadell Highway. Next fuel .. east
771 km Coober Pedy or west 550 km Laverton.
Population? 1? ... ~200 at Tjuntjuntjara. the nearest aboriginal community?
https://www.ilkurlka.org.au/
Possibly these kind of places only go on certain types of map .. Hemma
does a good job with highlighting such places with fuel/store symbols
... and usually some contact details.
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