OpenSeaMap-dev:Harbours to merge

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This is a tutorial for merging harbours...

In OpenSeaMap we use several DBs with harbour data and there are other DBs who are offered for use.
A lot of harbours are stored in all this DBs.
So we need a merged master DB.

Here you find a Chart with all harbours to merge

How to select

Select the area:

  1. Scroll to your area
  2. Zoom in to z=17 or so
  3. Check the different harbours and marinas there:
    click to the icons and read the informations
    for yellow icons you can find details at SkipperGuide by "Click to details"

If you detect doublettes:

  1. Click to one of them and select it by "Click to merge"
    the selected harbour is set to the right side
  2. Click to the other of them and select it by "Click to merge"
    the selected harbour is set to the right side too
    If you did made a mistake: you can de-select a harbour on the right side by clicking on the "red minus" there

Now the merging-form appears :-)

How to merge Name

For distinguish harbours with similar names, different writing systems and chaotic foreign nameings OpenSeaMap uses:

  • The system of endonymes.
    Endomym means the name like local people call the location in their common and/or official language.
  • 5 different name-fields with specific difined rules

Two of the name fields comes frpm the World Port Index (WPI) and are very simpel.
If the harbour is listed in WPI: Take the two listed name to the two WPI-name-field.
If the harbour is not listed in WPI: build a name following the WPI-rules.

There are two WPI name fields:

WPI name without diacritics

 : English, first letter as capital, following letters as lowercases
use only ASCII (ABCDEFGHIJKLMNOPQRSTUVWXYZ and abcdefghijklmnopqrstuvwxyz)
replace each diacritics by the letter without the diacritic:
de: Ä=A, Ö=O, Ü=Ü, ä=a, ö=o, ü=u, ß=ss ()
dk: ø=o, å=a, ü=u (Kobenhavn, Grena)
fr: é=e, è=e à=a, â=a, ç=c, ()
sk: ö=o (Malmo)

WPI name with diacritics

English, first letter as capital, following letters as lowercases
use ASCII (ABCDEFGHIJKLMNOPQRSTUVWXYZ and abcdefghijklmnopqrstuvwxyz)
and diacritics like ä ö ü ø å é è â ç
de: ÄÖÜäöü (Lübeck, Glückstadt, Eckernförde)
dk: ø å ü (København, Grenå)
ES: ñ (
fr: é=e, è=e à=a, â=a, ç=c, ()
SK: ö (Malmö)



If the harbour is not listed in WPI: build a name following the WPI-rules:

English, first letter as capital, following letters as lowercases
use only ASCII (ABCDEFGHIJKLMNOPQRSTUVWXYZ and abcdefghijklmnopqrstuvwxyz)
Don't use diacritics (no äöüßàéèâøåñ)
de: ä=a, ö=o, ü=u, ß=ss (Lubeck, Gluckstadt, Eckernforde)
dk: ø=o, å=a, ü=u (Kobenhavn, Grena)
fr: é=e, è=e à=a, â=a, ç=c,
sk: ö=o (Malmo)

Local latin name

Local name as endonym in latin letters
if the local writing system is no latin: use the wikipedia:en:BGN/PCGN romanization as [[wikipedia:en:transciption|transcription]
Allowed special signs in locations in:
DE: ä ö ü (Lübeck, Glückstadt, Eckernförde)
DK: ø å (København, Grenå)
ES: ñ (
FR: é (
SK: ö (Malmö)

Local script name

local name as endonym in local script or writing system (Chinese, Arabic, Kiryllic, Latin, Greek, Japain and the Indian ones)

LOCODE

see the US/LOCODE-list - Abrevation for country (2 letters) and for location (3 letters, may be added by a number)

How to merge Position

Set the position by a <Right-mouse-click>
For to get it exact, it is only possible in z=18..16
If you like to move the setted position: click e second time by <Right-mouse-click>
The result is visualised by the croshair-marker (and by the coordinate, which can not be edited by keyboard).

Harbours

Please set the position of the main marker in the approach, before the harbour entrance.

Parts of a harbour

Set the maker in the middle of the basin.

Quais

Set the marker in the front of the quai.

Piers

Set the marker on the pier.

How to merge Importance, Size

For a meaningful cartography we need to disinguish the size of the harbours.

We use an artificial size item for now (derived from WPI and SG):

Old source
Item Remarks
WPI (large) L
WPI (medium) M
WPI (small) S
WPI (very small) VS
SG (harbour) H
SG (marina) M
SG (anchorage) A
needs to be transformed to →  
New merged
Item Remarks
Harbour large Main port of a coutry
Harbour medium Important industrial port, ferry port, fishing port
Harbour small small fishing port with some douzand berths and ferry/cargo landing place
Harbour very small only a few berths, or one landing place for ferry or cargo
Marina big > 200 berths, wide service
Marina small some douzand berths
Recreation anchorage protected area with appropriated depth

The importance derives also from dominance and prominence (other important harbours nearby).
So the meaning is different in different areas/parts of the sea.


Future

For the future, a better solution is to derive the importance of a harbour from its facts:
number of berths, max. size of ships, max. draft, annual ship traffic, annual passenger traffic, annual cargo traffic, connection to airport and railway, importance of the habour town, size of the harbour town, main port of an area or island, distance to the next important port, etc.