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#1 2012-09-25 23:39:53

IvanKomarov
Member
Registered: 2012-09-25
Posts: 2

Systems and units in the US

Hello everybody,

I have been a contributor of OSM for a while. As I started sailing this season, I got interested in this project too ))
I tried to map some seamarks at Milwaukee harbor and faced difficulties right away.
First of all, Seamapeditor does not recognize IALA-B system that is used in the Americas and screws the system and seamark:buoy_lateral:category all the time I use the GUI.
Even worse, the Americans tend to use feet instead of meters wherever possible. When it comes to map height of lights, feet are used on all nautical charts. Wiki recommends mapping light heights in meters, but it would hardly work in the US. So I suggest allowing "ft" suffix after the number to distinguish between meters and feet.
There is another issue with regards to long distance measurements. In the Great Lakes area, as I was first surprised to spot at a map and then kindly informed by a Nautical Chart specialist, there is a historical tradition to measure light ranges in statute miles instead of nautical. So we might need "St" suffix or like to address this problem.

Regards,
Ivan.

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#2 2012-09-26 11:41:32

malcolmh
Member
From: Hull, UK
Registered: 2012-09-05
Posts: 194

Re: Systems and units in the US

Ivan,

The JOSM plugin does support both IALA systems. By default it starts in IALA-A mode, but if you save a seamark that is set to IALA-B, your user preferences will be updated so that it re-starts in B mode & lateral marks that you create will have the correct colours. The only thing that does not change is the colours used on the buttons.

As to the question of units, I will have to address this as a feature request, to be included in the next edition of the editor & renderer. There is provision for defining height & length units within S57, but I need to research this some more & think about how best to implement it.

Regards,
Malcolm


Malcolm Herring, Developer

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#3 2012-09-30 21:35:57

IvanKomarov
Member
Registered: 2012-09-25
Posts: 2

Re: Systems and units in the US

The JOSM plugin does support both IALA systems. By default it starts in IALA-A mode, but if you save a seamark that is set to IALA-B, your user preferences will be updated so that it re-starts in B mode & lateral marks that you create will have the correct colours. The only thing that does not change is the colours used on the buttons.

You are right, Malcolm,
it remembers the system. Colors are still confusing though... )) Another issue (or feature request) I have is tower-like beacons are often striped. The editor has a built-in ability to apply stripes to the top mark, but what about bodies of beacons? Why don't we have the same color scheme for mapping them?
And stake-like beacons, on their own, typically have a number on them. Shall it go to the seamark:beacon_lateral:ref tag?

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#4 2012-10-01 07:34:54

malcolmh
Member
From: Hull, UK
Registered: 2012-09-05
Posts: 194

Re: Systems and units in the US

Yes, body colours & striping can be set by clicking the small >> button on the left of the panel. This will bring up another sub-panel with the colours & patterns as well as several other object parameter settings.

The numbers on buoys and beacons should be entered into the "Name" box.


Malcolm Herring, Developer

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