How to map landuse
|This page is not a proposal, it should describe all mapping-methods which are possible regarding the proposals and discuss them. See also (FIXME: what is the difference?! really need for another page?): Landuse, Proposed features/landcover, Land use and areas of natural land.|
- 1 Definition
- 2 Level of Refinement
- 3 Frequently asked questions & Common mistakes
- 3.1 Can I use both, landuse=* and natural=* on the same closed way?
- 3.2 Do I have to add natural=wood to landuse=forest?
- 3.3 I want to give a settlement a name. Can I tag it on the area with the landuse?
- 3.4 Does the amenity area of a school/university have to be excluded from surrounding landuse (e.g. residential)?
- 3.5 On which areas is it possible to add landuse=retail?
- 3.6 Since a park is already marked using leisure=park is it still necessary to add landuse=recreation_ground?
- 3.7 How should a track with a grass surface be mapped?
- 4 Beginners Method
- 5 The Multipolygon Method
Level of Refinement
...are only represented by ways. The landuse/natural is deduced from the neighbouring areas.
If there are shops existing in an area, but the major usage of it is for residential purpose,
Explanation: There are different levels of abstraction within OSM. highways are in general represented by ways (i.e. they are abstract). Those
Frequently asked questions & Common mistakes
- Yes. Usage by humans is orthogonal to what natural features exist within that area, even if there is a weak connection.
I want to give a settlement a name. Can I tag it on the area with the landuse?
- This is a case for a place=*-tag.
Does the amenity area of a school/university have to be excluded from surrounding landuse (e.g. residential)?
- Since the area marking the school is not used for the specific landuse (e.g. residential), it should be excluded.
- Areas which are mixed with residential/commercial since some shops exist in the ground floor and of course locations which are only used for retail. It is not necessary to compare the number of shops with the number of flats.
Since a park is already marked using leisure=park is it still necessary to add landuse=recreation_ground?
How should a track with a grass surface be mapped?
The Multipolygon Method
A native application of multipolygons is for example the case of an island in a lake.
The only way to map a named lake and an island within it is to include both ways with the roles outer and inner into a relation. The relation is tagged with type=multipolygon, the lake is tagged with natural=water,name=* and the island is tagged with landuse=*/natural=*.
Neighboured ways of landuse-areas share many nodes. To avoid to create two long ways sharing partially the same nodes, describe the areas with multipolygons which collect all outer and inner ways including the way shared by both areas. Because landuse=* is always an area and can therefore only be applied on closed ways, the relation has to wear the landuse-tag.
Analog to border-relations exclaves are able.
Tip: The most editors provide a shortcut-key to cut ways into smaller pieces.
Highways as outer and inner
In many cases the landuse on one side of a street differs from that on the other side. In those cases the highway can be cut into pieces as required. The required pieces can be put into the relation with the roles inner or outer.
This section is discussed at Discussion and not yet decided.