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KEY ASPECTS OF NAVIGATION- Water

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Description

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database representation of a way or course through which water flows or an area covered by water

represents water body like river, canal, lake, sea, ocean, water body covered with ice

swimming pools, marshes, swamps and glaciers are not considered as Water Element

No overlap with land cover features(forest & semi natural area)

Standard names to be captured

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Data Model : Area or Line Representation

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a line representing the center line of a river or canal. Islands that have to be captured according to General Capturing Rules of Islands, and main land will be separated only by a line.

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General Capturing Rules

Water element shall be captured for each water body permanently or semi-permanently covered with water with a width of 10 meters or more or with a surface of 10 000 m² or more or if it has a special significance

shall not be captured for the underground part of a waterway except for a river flowing in a tunnel under a road.

Dividing line between bounding Water Elements

- Water element at join of waterways

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waterway with one name is one closed area, the other waterway stops where the two rivers join

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General Capturing Rules

-where inland water meets the sea or ocean, the dividing line between those two different Water Elements will be very rough and based on names. Generally the dividing line will be as straight as possible.

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-In case a river flows in and out a lake and the river has a higher display class than the lake, a part of the lake that connects the in-flowing river and the outgoing river should be considered as part of the river. It will be represented by a Water Element different from the Water Element(s) representing the other part(s) of the lake.

Standard Name for Water Element of the part of the lake which connects the in-flowing river and the outgoing river should be the same as the Standard Name for Water Element of the river

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General Capturing Rules

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General Capturing Rules

-Water Element does not stop at a tributary not belonging to General Capturing Rules

- Water Element stops where water can not flow through e.g. at dams.

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General Capturing Rules

Landing stages and piers are not considered for capturing Water Elements unless a Road Element is situated on this landing stage or pier that fulfils the capturing rules

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Network Capturing Guidelines

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Water Center Line

database representation of the center line of a river or a canal in a generalized way

Water Center Lines represent only linear water bodies (rivers, canals)

Line Feature Can have a Standard Name and Alternate names. In case a river

has a different name at its mouth, Standard Name for Water Center Line will always be the name that is given in general to the river from its spring till its mouth

-e.g. Rhône becomes Grand Rhône at its mouth, Standard Name for Water Center Line will be Rhône for the whole extent of the river

Water Center Line mandatory has Water Display Class (unique value)

Water Center Line is no transportation element

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Main/Minor arm ?

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Distinction into main and minor arm can be based on the width, the shipping lane, the name,…. Within river deltas or river mouths, the main arm will generally correspond with the shipping laneWater Center Line represents the main river arm. Minor river arms are not taken into account. Only in case it is not clear which arm is the main river arm, Water Center Line shall be captured for both arms

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General Capturing Rules-Water Center Line

Water Center Line shall be captured for each river or canal from the moment the width becomes 10m or more that belongs to the first class of Water Display Class

shall not be captured for harbor basins and river ports and underground part of a waterway except for a river flowing in a

tunnel under a road

Harbor basins : enclosed area of a river or harbor designed so that the water level remains unaffected by tidal changes.

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Shape of Water Center Line

Captured more smoothly on maps with scale 1/1 000 000 and smaller

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Relation With Water Elements

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Australia-Area Capturing Rules

Water Center Line shall be captured according to General Capturing Rules.

Additionally, Water Center Line shall be captured for each area permanently or semi-permanently covered with water with a width of 10 meters or more or if it has a special significance, and which belongs to the second, third, fourth and fifth Water Display Class.

Water Center Line shall be captured for each arm of a river.

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Water Display Class

database representation of a classification of water bodies based on the importance of the role that a water body has with respect to its function as a landmark

Mandatory and unique attribute of Water Element and Water Center Line

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Classification of Water Display Class

First Class (highest):

-Generally ,National and international water bodies

Second Class:

- Generally ,Regional water bodies

Third Class:

- Generally , State-wide water bodies

Fourth Class:

- Generally ,Multi-county, county and metropolitan water bodies with name

Fifth Class (lowest):- Generally , Multi-county, county and metropolitan water bodies depicted, which are not identified by a name.

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Values of Water Display Class in Australia

0:

-Undefined

1:

- Times Atlas (most important water areas e.g.: lakes, lagunes, ...)

2:

- Mair (other water areas and large rivers)

3:

- Water Area with name (water represented, with name on 1:200,000 maps)

4:- Other Water Area with name (other water areas or lines)

5:

- Other Water Area

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Capturing Rules-Water Display Class

Water Display Class 1 for seas and oceans If a certain water body belongs to more than one class, always the

highest Water Display Class shall be assigned to the respective Water Element or Water Center Line

Water Display Class of one and the same river doesn’t change

- A chain of water (i.e. a canal or a river) identified by one name must have one Water Display Class

-Water Display Class does not decrease going upstream a certain river or canal• e.g. the river that joins the sea or ocean will have a certain Water Display Class, the rivers

joining this river will have a lower or in some cases the same Water Display Class than the first mentioned river and so on.

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Capturing Rules-Water Display Class

Water Display Class where a lake is involved :a river flows in and out a lake

- CASE 1) River has a higher class than the lake• Water Display Class of the part of the lake which connects the in-flowing river and the outgoing river

should be the same as the Water Display Class of the river

- CASE 2) LAKE has a higher class than the river• the complete lake should get only one Water Display Class

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Capturing Rules-Water Display Class

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Questions

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