[talk-au] Port Hacking (Bay v. Water)

Markus_g markus_g at bigpond.com
Thu Oct 21 12:04:10 BST 2010

Some one has has edited the data since. So it is now different. 

I have removed the coastline across the entrance and removed the
natural=water tag in the multipolygon.

Also I added back the inner bays that were removed by the user.



-----Original Message-----
From: talk-au-bounces at openstreetmap.org
[mailto:talk-au-bounces at openstreetmap.org] On Behalf Of David Groom
Sent: Thursday, 21 October 2010 8:36 PM
To: OSM Australian Talk List
Subject: Re: [talk-au] Port Hacking (Bay v. Water)

----- Original Message ----- 
From: "Andrew Harvey" <andrew.harvey4 at gmail.com>
To: "OSM Australian Talk List" <talk-au at openstreetmap.org>
Sent: Tuesday, October 19, 2010 11:51 PM
Subject: Re: [talk-au] Port Hacking (Bay v. Water)

> On Tue, Oct 19, 2010 at 11:34 PM, Markus_g <markus_g at bigpond.com> wrote:
>> Well at the moment it isn't rendering correctly as there is no coastline
>> across the entrance.
> I see you've fix that now.

I'm not sure that was correct.

Looking at all ways forming the coastline there should be an uninterrupted 
sequence of ways.

Currently there appears to be:

1) one "section" of ways tagged as natural = coastline which are a 
continuous collection of ways running up the coast and across the entrance 
to the bay.

2) another "section" of ways within the bay , tagged as natural = coastline

Either the ways in the bay need to have natural = coastline removed from 
them, OR the bit across the mouth of the bay needs to have natural = 
coastline removed from it.

I cant say whether this is the reason why the bay is not rendering blue, but

it certainly is not going to help matters.  Also note that if this is the 
reason, then due to the fact that mapnik coastline layer is not updated as 
frequently as other data, then no immediate change may be noticeable.


>> Well to be tagged as natural=water it should be a body of standing water,
>> such as a lake or pond.
>> To be tagged as natural=bay it should be an area of water mostly 
>> surrounded
>> or otherwise demarcated by land. Bays generally have calmer waters than 
>> the
>> surrounding sea, due to the surrounding land blocking some waves and 
>> often
>> reducing winds. It can also be an inlet in a lake or pond.
>> I think it should be a bay or coastline.
>> If I am unsure I use the following source to decide, but others may have
>> different reasons to tag certain ways.
>> http://www.ga.gov.au/place-name/
>> It lists the feature code for Port Hacking as a bay.
>> http://www.ga.gov.au/bin/gazd01?rec=78217#
> Okay, I'm happy with bay now.
> I've split off some of the other bays
> (http://www.openstreetmap.org/browse/changeset/6103886), I wasn't sure
> if these should also form part of the mulitpolygon as well as outer.
> Also it seems the main boundary for Port Hacking is a way traced from
> Yahoo, it is close to the ABS administrative boarder, I was wondering
> if we should just place the Port Hacking boarder on the ABS boundary.
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