The natural = coastline tag is used to mark the mean high water springs range over the shoreline during the edge of the ocean.
In which may be the shoreline?
Basically that is the highest line water hits in regular conditions. (See the imagery on the right for many some ideas how exactly to decide where that range are.)
Around Antarctica where you'll find ice shelving the coastline is mapped in the "calving line", this is the range in which the available drinking water fulfills the permanent ice shelving. See Antarctica/Marking for facts.
Mean low-water springs may be the position of the cheapest wave. There was presently no concurred method of marking this range in OSM. The area between mean low-water springs and OSM coastline might be marked based whatever soilA : for advice sand (see natural = sand or normal = shoal ), rocks (read natural = bare_rock or normal = stone ), dirty (see wetland = tidalflat or normal = mud ).
Simple tips to go into the information
Marking the coast is a bit different than along with additional features in OSM and you need to be careful for this right. Make sure you utilize natural=coastline on methods, perhaps not nodes or relations.
For small isles one enclosed ways are pulled all over border of an area, looping straight back on itself. For large landmasses the coast means a series of linear techniques linked end-to-end. These ways must write a consistent interlinked shoreline, the finish node of just one means must be the begin node of this further method. A break within the coast or any other error causes significant troubles whenever using this facts. If you are not positive about editing, it's always best to perhaps not make major improvement beyond adjusting nodes to align greater with aerial imagery.
The path the ways tend to be driven is essential! They must end up being attracted in order that the land is found on the remaining part and liquids about right-side of this way (whenever viewing toward the way arrows). If you view this as tracing around an area of land, e.g., an island, then your coastline way ought to be working counterclockwise.
Usually do not put more prices of natural =* using semi-colon importance separators, as it is not required. (additionally, it is not recognized by many facts people and renderers, but it's maybe not enough need to take into account it a bad idea by itself). A good example could be natural = coastline;bare_rock for islets, which will be symbolized as normal = coastline as a part of a multipolygon relation marked with natural = bare_rock .
- ways tagged natural = coastlineexample
- relation with all-natural = bare_rocktype = multipolygon - and elizabeth =* + room = isletexample
- normal = coastline means would be inside regards with outerrole.
The validator in JOSM can look at the shoreline for validity. Use it if you are using JOSM. If not utilize the OSM Inspector shoreline see at to evaluate for mistakes.
Coastlines typically correspond with other properties, eg lake lips, landuse and borders. You can split-up the shoreline in as much parts since you need to, just be sure often there is a continuous range.
Think about lakes?
This label shouldn't be utilized for freshwater ponds. Ponds tend to be mapped as closed means or multipolygon interaction with labels such as for instance natural = water or landuse = reservoir .
Before multipolygon connections were added to OSM, some huge ponds happened to be furthermore marked with natural=coastline, however they escort girl Hayward all being switched now. The only waterbody without degree link with the ocean that's utilizing this label could be the A Caspian Water . No one should make use of this tag for almost any additional inland liquid segments.
River ways tagged as waterway = river or waterway = supply end during the coast on a typical node for all the river means plus the coastline method. Large streams marked with waterway = riverbank or all-natural = drinking water and liquid = river bring a manner across their particular mouth definitely marked all-natural = shoreline . In those instances the river range also can offer on the reverse side with the coast, as an example if there is a dug deepwater channel or reasonable transport lane.
You'll find conversations about where change involving the sea to a broad lake (marked with waterway = riverbank ) should happen; you will find a view that this should essentially be at the top of the tidal part regarding river, but it is additionally accepted that junction are nearer to the mouth area regarding the lake because of the tidal section of the river tagged with tidal = yes . The main thing will be make certain that the shoreline and riverbank show at the least two surrounding nodes to generate a seamless junction within river and also the sea. There's a proposal detailing higher minimizing limitations associated with the keeping this junction as there are another proposition describing marking of tidal streams.
Bays and other huge tidal salt-water markets are included in the ocean when they attached to the water and must always be marked as a result.
The coast data for some countries ended up being originally created from a low-resolution data by using the PGS significance also imports. Inaccurate shorelines is visible primarily in a sawtooth shape, whereas the truth is the coastlines are typically gentle curves. In a lot of countries the shoreline steps have actually afterwards come improved either with tracing from aerial images, or replaced by best vector data.
Be mindful when tracing coastlines from aerial graphics. Those photographs in many cases are nearly for the correct position, which means that your coast might appear like it fits completely on artwork, in reality it is a hundred or so m down. Ensure the info meets to GPS facts.(which include official high water and low-water information when it comes to UK).
Errors and reliability examining
It is very important the coastline is formed and tagged properly. A single error inside the coast somewhere in Africa might imply most of Asia-Africa-Europe landmass cannot be drawn correctly! Always be certain the coastline has got the correct direction (land left, liquid off to the right). Try not to get across a coastline over it self - this has no meaning and e point twice (pinch point) aside from the start/end point (if appropriate). Should you want to making an island, beginning an alternative way.
Various other coastal features
Over the coast it is often useful to incorporate organic = beach , organic = bare_rock and all-natural = cliff for shores, revealed bedrock and high cliffs; in addition organic = wetland for many different types of wetland, including wetland = tidalflat , wetland = mangrove and wetland = saltmarsh . man_made = groyne can be used for sea defenses.
For remote areas of unconsolidated ingredients inside the sea which have been partialy revealed at reduced tide, read all-natural = shoal .
Making use of OSM coastline information