[talk-au] Mangroves and coastline

Brent Easton b.easton at exemail.com.au
Fri Dec 28 09:08:04 GMT 2007


natural=marsh will be rendered eventually.

I have the skills to do the Osmarender version. How do we want it to look? I did a test version a while back with a proper little marsh symbol (lines and grass) like on topo maps. It looked pretty good.

Cheers,
Brent.

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On 27/12/2007 at 12:40 PM David Groom  wrote:

>----- Original Message ----- 
>From: "Stephen Hope" <slhope at gmail.com>
>To: "OSM Australian Talk List" <talk-au at openstreetmap.org>
>Sent: Thursday, December 27, 2007 12:05 PM
>Subject: [talk-au] Mangroves and coastline
>
>
>>I was looking at the top of Cape York, where the current coastline in
>> OSM ends.  I was comparing the PGS coastal data with the current OSM
>> data and a yahoo image of the current coastline, and notices that the
>> data seems to be out by several kilometres.  Finally I realised that
>> the PGS data is following the dry land border, whereas the current
>> data in OSM is following the outer edge of the mangrove swamps.
>> Normally this is not a major difference, but here there were
>> differences of up to 12 km.
>>
>> Are there any guidelines as to which we should use? I guess it depends
>> on your definition of the coast. I can see arguments both ways. If we
>> decide to use the outer mangrove edge, then we should check the PGS
>> data in Qld even more than normal, because of the reefs and large
>> mangrove beds behind them in places.
>
>
>In Cairns & Darwin areas, I have marked the coastline as the outer edge of 
>the mangrove swamps. (ie at the mangrove / clear water interface), but
>kept 
>the PGS outline at the land / mangrove interface removed the tag 
>natural=coastline, and tagged an area as natural= marsh.  (maybe not the 
>best tag, but currently there is no natural=mangrove_swamp, so it appeared 
>to be the best compromise).
>
>Sadly neither the Mapnik or osmarender layers currently render
>natural=marsh 
>(i have put in request for both to do so, but to no avail), but you can
>see 
>what the rendering would look like at
>
>http://wiki.openstreetmap.org/index.php/Image:Cairns.png
>
>http://wiki.openstreetmap.org/index.php/Image:Darwin.png
>
>David
>
>
>>
>> While I'm thinking of it - are we interested in mapping the Great
>> Barrier Reef? (or any other reefs for that matter?)  Permanently dry
>> islands, sure.  But what about the low-tide only areas, or those that
>> are just below water level all the time?
>>
>> Stephen Hope
>>
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>> 
>
>
>
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____________________________________________________________
Brent Easton                       
Analyst/Programmer                               
University of Western Sydney                                   
Email: b.easton at uws.edu.au





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