Tag:boundary=forest

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Public-images-osm logo.svg boundary = forest
20210104 152558.jpg
Description
A mostly wooded area with explicit boundaries Edit or translate this description.
Group: Boundaries
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areasmay be used on relations
Useful combination
See also
Status: approvedPage for proposal

A delimited forest is a land which is predominantly wooded and which is, for this reason, given defined boundaries. The lands inside the boundaries are often subject to different rules than the surrounding lands. The delimited area is typically named, and have materialized, visible, typically cleared, boundaries. It may cover different tree stands, non-wooded areas, highways… but all the area within the boundaries are considered and managed as a single forest.

Identifying delimited forests

Though delimited forests are mainly wooded, they are not totally so. Delimited forests may contain screes, ponds, scrublands, or grasslands which are not covered by trees, and are consequently not tagged as wooded areas. Such non-wooded areas are still part of the delimited forest, as they may be:

  • managed by the manager of the delimited forest;
  • under reforestation;
  • lands with a distinct, wood-related ecosystem (glades for instance, which essentially exist because they are in a wooded area, else they would be called grasslands);
  • legally considered part of the surrounding forest, i.e. they are subject to the same subset of laws, rights and obligations ( Régime forestier in France, for instance).

Some forests may even be predominantly scrubland (natural=scrub), which often forms after a clearcut followed by natural regeneration (i.e. no plantation). In this case, the land will not be again tree covered until the seedlings grow, which can take decades.

Here are some examples of delimitation of forests and forests compartments in France:

Boundaries

A wild wooded area is considered a delimited forest when its limits are clearly materialized, for instance with paint, boundary markers, or cutlines.

The markings used to delimit forests are more significant than the standard markings used for common land lot boundaries. Standard land ownership boundaries in wooded areas typically lack signs, marks or paint highlighting the difference between wooded area boundaries and non-wooded area boundaries, but local laws and customs may prescribe carved marks or other methods for the materialization of delimited forest boundaries. If a wooded area is only delimited with land lot boundary stones, without any signs, marks or paint highlighting the difference between its boundaries and standard land lot boundaries, the area should not be modelled as a delimited forest.

Forestry activities

This tag is not about forestry activities: delimited forests may be the place of forestry activities, but this is not necessarily the case. Materialized boundaries may be mandated by law, current practices or necessity, but do not necessarily imply that the encompassed area is subject to forestry works.

Forests vs protected areas

Delimited forests and protected areas may overlap or coincide. If they overlap, they can be modelled separately, with a boundary=protected_area entity and a boundary=forest entity.

In some cases, though, a delimited forest may also be a protected area (most likely, IUCN Category VI): for instance, in France, the Réserve Biologique Dirigée (RBD) and Réserve Biologique Intégrale (RBI) can legally only encompass public forests, which are always delimited forests. In such a case, the facts that the area is, on one hand, a forest, and, on the other hand, a protected area, cannot be separated.

In the case that a whole delimited forest is also a protected area and these two characteristics apply to the same entity (a RBD/RBI, for instance), they must be mapped with a unique OSM entity, which would be tagged with boundary=forest + protect_class=*, consistently with the tagging scheme for IUCN Category II national parks (tagged boundary=national_park + protect_class=2). It is appropriate to also tag this entity with other relevant tags commonly used with protected areas, such as related_law=*, access tagging, or leisure=nature_reserve if applicable, to reflect the dual status of the area.

If, on the other hand, the protected area and the delimited forest exactly encompass the same area but are distinct features (that is to say, the legal protection status of the area is not attached to the area being also a delimited forest), they should be mapped with separate entities: a boundary=forest entity for the forest, and a boundary=protected_area for the protected area.

Areas named "Forest"

The fact that an area has the word "forest" in the name does not necessarily mean that the area should be mapped with the proposed tagging scheme: the wooded state of the land must be a predominant characteristic, and there must be defined boundaries. For instance, US National Forests have mostly unmaterialized boundaries, and are consequently not in the scope of the proposed tagging scheme.

Named natural forests, such as Germany's  Black Forest, are indeed large wooded areas which are considered as a unique forest, but they lack clear boundaries, are not effectively managed as a whole and, as such, do not qualify for the proposed tagging scheme.

Is this a delimited forest?

Here are some special cases where the applicability of the approved boundary=forest relation may need clarification.

Case Applicable? Why?
Illegal agricultural deforestation area No It most likely lacks precise boundaries, which are a prerequisite to be modelled as boundary=forest. In addition, once the deforestation is started, the area likely does not keep its wooded state for long and is thus out of scope for OSM.
Legal forestry concession with illegal logging Yes Even if the logging is illegal, the area is wooded, and the concession should have verifiable boundaries. Of course, if the area becomes totally, permanently deforested, without letting natural regeneration take place or replanting, the area is no longer a forest.
Wooded land without verifiable boundaries No If the area limits are not verifiable, it should not be modelled as a boundary=forest relation.
The  Black Forest No Even if it is a predominantly wooded land, which is commonly known as a whole, single wooded area, its boundaries are neither distinct nor verifiable, hence disputable, so it is not to be modelled with a boundary=forest relation. That being said, the underlying physical, wooded lands themselves are still eligible to modelling with natural=wood/landuse=forest.
Mostly wooded area without verifiable boundaries No The area is predominantly wooded, but its boundaries are unverifiable.
A unique, whole area with verifiable boundaries and predominantly wooded, but fragmented in distinct, separate areas Yes If the fragmented area is still considered in its entirety as a unique delimited forest, then it is to be modelled with a unique boundary=forest relation, which would enclose all the separate pieces of wooded land; use natural=wood/landuse=forest for the physical wooded land.
A wooded area with distinct existence and verifiable boundaries, which contain screes and glades Yes The boundary's verifiablity and the area being predominantly wooded qualifies it for a boundary=forest relation. As this relation is about delimited forest boundaries, if the screes and glades are considered part and parcel of the delimited forest, the relation will not treat them as exclaves of the said delimited forest. These non-wooded areas are to be mapped by their own entities, and the wooded land around with natural=wood/landuse=forest entities; once again, do not overlap natural=wood/landuse=forest entities and non-wooded entities.
A wooded land lot whose boundaries are mere boundary stones No The materialization of boundaries in a way which is distinct of standard land lots is required to prevent importing mere cadastral data; use landuse=forest or natural=wood without boundary=forest, which is not designed to allow importing plain cadastral data.
A wooded land lot whose boundaries are marked in a way distinct of adjacent land lots Yes The materialization of boundaries in a way which is distinct of standard land lots is enough, unless you are sure the specific marks used are unrelated to forests.
A US National Forest Likely, no Typically, US National Forests have no materialized boundaries, so they are not in the proposal scope.

Note regarding boundary materialization

The approved proposal mandated the materialization of boundaries, out of verificability concerns. That being said, some contributors, in vote comments, on the Talk page of the proposal or in the various preliminary discussions, explained that in their country, forest boundaries are not materialized out of practical reasons, for instance lack of funding, like in some African countries.

Though some sentences which follow do not meet the approved definition of this tag, it may happen that you want to map a forest corresponding to the above definitions, with the difference that its boundaries are not materialized but are still verifiable according to local laws and practices; for instance, the boundaries are published, and this publication is generally acknowledged by local people, societies, enterprises, authorities… as a legitimate, verifiable source. In such a situation, this source could be considered verifiable enough to allow mapping the forest. Be advised, though, that this appreciation may be challenged by mappers having stricter criteria of verificability, i.e. requiring boundary materialization.

How to map

A delimited forest should be mapped as follows:

  • The overall delimited forest should be mapped as an enclosing polygon or relation. Do not add land cover tagging (such as natural=*) to this boundary or "cut out" minor non-wooded areas such as ponds or screes that may be present.
  • A delimited forest may include smaller delimited forests, themselves either divided or not in compartments, so a boundary=forest entity may enclose smaller boundary=forest entities.
  • Natural features (such as natural=wood, natural=water, natural=scree, etc.) should be separately tagged with their own polygons delimiting actual areas where these features are present, and as an inner multipolygon member of the enclosing natural=wood/landuse=forest features if they are not wooded. Woodland-specific tagging such as leaf_type=*, leaf_cycle=*, etc., should be tagged on natural=wood/landuse=forest features.
Example modelling, with two different wooded areas (tagged natural=wood) and the overall delimited forest entity (tagged boundary=forest); the pond is considered part of the delimited forest and therefore included in it.

The overall delimited forest (entity tagged boundary=forest) can be tagged as follows:

Suggested tagging for boundary=forest
Key Value Discussion
type=* boundary Mandatory if the entity is a relation [1]
boundary=* forest Mandatory
name=* The forest name Recommended. If applicable, the delimited forest can be named with this tag, and, maybe, its subtags, like name=Forêt de Fontainebleau or name:de=Wald von Fontainebleau.
ref=* The forest ref Optional. Such reference is probably country-based, so one should use a subtag, like ref:FR:ONF, whenever applicable; the choice of this subtag for a given country is up to the local OSM community.
operator=* The forest operator Optional.
owner=* The forest owner Optional.
operator:wikidata=* Wikidata ID Optional. Use for giving the wikidata ID of the operator; for instance, a French forêt communale, mandatorily managed by the national Office National des Forêts, would be tagged operator:wikidata=Q3260938.
owner:wikidata=* Wikidata ID Optional. Use for giving the wikidata ID of the owner; for instance, the French forêt communale d’Épinal, owned by the commune d’Épinal would be tagged owner:wikidata=Q173695.
source=* The source used Optional.
protect_class=* Protection class ID Optional. Use if the delimited forest has also been designated a protected area as defined by IUCN protected area categories, and if the protected area and the forest form a single entity.
protection_title=* The forest owner Optional. Use if the delimited forest has also been designated a protected area as defined by IUCN protected area categories, and if the protected area and the forest form a single entity.
related_law=* The related law Optional. Use for giving the title of the edict or legal text which establishes or regulates the delimited forest.
leisure=* nature_reserve Optional. Use if the area is also a nature reserve; if there are access restrictions, don't forget to accordingly add access keys on the highways allowing access to the area.

What if I encounter a natural=wood/landuse=forest (multi)polygon which in fact represents a delimited forest?

Examples

French forêt communale

The forêt communale de Chauffecourt would be modelled by an entity (area or relation) tagged this way:

German state forest

The Einsiedler Wald relation would be tagged this way: