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#1 2016-06-21 15:01:41

bensa
Member
Registered: 2016-06-21
Posts: 3

Why small fairways are not shown online map

Is there a reason why small fairways are not shown on online map?

See for example:
http://map.openseamap.org/?zoom=14&lat= … &lon=24.42

Is there a way to make them visible?

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#2 2016-06-21 18:15:57

AdVerburg
Member
From: Goes, the Netherlands
Registered: 2016-01-23
Posts: 16

Re: Why small fairways are not shown online map

Prime reason for not visible is that there is no fairway drawn. Just land, island and water in between, and some buoys.
If you want to have "roads" on the map you must draw an area and tag that with seamark:type=fairway and if possible with seamark:name=TheName.
Such fairways become visible when the zoom level is 14 or greater.
Have a look at  http://map.openseamap.org/?zoom=14&lat= … FFFFFFFFFF

best regards, Ad Verburg

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#3 2016-06-23 05:02:06

bensa
Member
Registered: 2016-06-21
Posts: 3

Re: Why small fairways are not shown online map

Ok. Thank you for the information!
I'll start drawing fairways then.

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#4 2016-06-25 17:34:39

Laiva
Member
Registered: 2016-06-25
Posts: 2

Re: Why small fairways are not shown online map

All the fairways in Finland were traced from Ministry of Transportation seamaps under CC-4.0 license but were deleted by user malcolmh.

http://www.openstreetmap.org/changeset/25012359
http://www.openstreetmap.org/changeset/25014406
http://www.openstreetmap.org/changeset/25014465
http://www.openstreetmap.org/changeset/25021358
and so on..

They could be easily reverted back to database but there was a post issued on the matter:
http://forum.openseamap.org/viewtopic.php?id=1990

The problem is that the fairways in finnish system can also have bends and curves in the official nautical maps while the S-57 standard says they should be straight.

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#5 2016-06-26 06:39:31

malcolmh
Member
From: Hull, UK
Registered: 2012-09-05
Posts: 193

Re: Why small fairways are not shown online map

You are confusing fairways with recommended tracks. The objects that I deleted were "seamark:type=recommended_track". Recommended tracks should be single straight line segments aligned along part of a "seamark:type=navigation_line" segment. "seamark:type=fairway" is mapped as a polygon and can be any shape. It would not be sufficient to re-tag non-area objects as fairways as they would not be rendered.

Last edited by malcolmh (2016-06-26 06:42:02)


Malcolm Herring, Developer

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#6 2016-06-26 08:06:40

Laiva
Member
Registered: 2016-06-25
Posts: 2

Re: Why small fairways are not shown online map

You are right. I belive the thread author meant indeed recommended tracks. Here is a link to the official S-57 layout of the mentioned area. It can be noted that recommended tracks are not straight lines to the navigation lines of leading marks in most cases.

http://www.paikkatietoikkuna.fi/web/en/ … arker=true

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#7 2016-06-27 06:41:11

malcolmh
Member
From: Hull, UK
Registered: 2012-09-05
Posts: 193

Re: Why small fairways are not shown online map

I can see on that chart Navigation Lines that are aligned on pairs of leading beacons, which then become Recommended Tracks at their far end. These Recommended Tracks join onto other similar pairs to form a continuous track. Note that each track segment is a separate object, even though they join with others to form a single line. (in OSM this would be a series of two node ways that share nodes.)

This map is copyright material and cannot be used as the source of data for the OSM Db. Also a CC-4.0 license is not compatible with ODbL unless explicit permission is obtained from the copyright holder. See: http://wiki.openstreetmap.org/wiki/Impo … patibility

Last edited by malcolmh (2016-06-27 08:19:31)


Malcolm Herring, Developer

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#8 2016-07-20 07:42:50

bensa
Member
Registered: 2016-06-21
Posts: 3

Re: Why small fairways are not shown online map

Hmm..
Is the main problem the fact that recommended tracks are can not be represented perfectly similar to ones in official charts? Or the fact that the width of the fairway is not shown everywhere?

The width of every fairway / recommended track is not shown on official maps either..

If I draw them again will they be deleted by a purist who insists that it is better to have no tracks at all than tracks that tell everything essential but are not "pure" enough..? Are you sure that this "malcolmh" is not a mole from a commercial map company?? =p

It is ridiculous to claim that the tracks are not needed especially if the map has no depth data.

Right now you can not use the the openseamap even for route planning in Finland with routes AND depth data missing.

So, I recommend that you should reverse the deletions done by malcomh so we can have a map that can be used for something instead of having a map that has no use at all.

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