Proposed features/leaftype

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The Feature Page for this approved proposal is located at Key:leaf_type.


leaf_type/leaf_cycle
Status: Approved (active)
Proposed by: Rudolf
Tagging: leaf_type=broadleaved/needleleaved/mixed
Applies to: NodeWayArea
Definition: Describes the type of leaves.
Rendered as: *
Drafted on: 2014-04-29
RFC start: 2014-05-02
Vote start: 2014-05-23
Vote end: 2014-06-06

Proposal

leaf_type=* describes the type of leaves, such as broadleaved or needleleaved.

leaf_cycle=* describes the phenology of leaves, such as evergreen or deciduous. Phenology is the study of cyclic and seasonal natural phenomena, especially in relation to climate and plant and animal life.

Rationale

Usage of "wood="
Value Usage
deciduous 269 228
mixed 171 085
coniferous 140 542
quercus 902
yes 541
evergreen 352
broad-leaved 194
eucalypt 126
broad_leaved 97
palm 66
nipa_palm 4
casuarina 2
Usage of "type="
Value Usage
broad_leaved 299 818
broad_leafed 96 697
broad_leaf 1243
broad-leaved 571
broad-leafed 434
conifer 28077
coniferous 1009
deciduos 2 632
deciduous 3 988
evergreen 230
palm 10782

There are several tags to indicate vegetation with leaves, e.g. landuse=forest, natural=wood, natural=scrub, natural=tree and others.

Today we have one additional key wood=* to describe the type of leaves. This key is arguable.

The oxford dictionary says: "wood =

  • 1. The hard fibrous material that forms the main substance of the trunk or branches of a tree or shrub.
  • 2. (also woods) An area of land, smaller than a forest, that is covered with growing trees."

The usage of wood= for the type of leaves is not suitable because wood relates to the trunc, not to the leaves. Maybe it is suitable for natural=wood, but the key also relates to forest, trees, hedges and shrubs.

The values wood=coniferous and wood=deciduous are ambiguous. Coniferous describes the kind of seeds, not the type of leaves, nor the phenology, but it seems that it is used for the leaftype. Deciduous describes the phenology, not the type of leaves, but it seems that it is used for the leaftype.

Coniferous stands for "cone-bearing seed plants with vascular tissue". See Wikipedia coniferous on Wikipedia. This plants are mostly needleleafed, but there also exist some with broad leaves (e.g. Gingko biloba).

There exist also the tag wood=evergreen to describe the phenology, but not the kind of leaves. This applies to needleleaved and broadleaved plants.

There exist also the tag wood=yes to mark the presence of trees.

Other values in use are palm, nipa_palm, eucalypt and casuarina.

There is also an extended usage of type=broad_leaved; type=broad_leafed; type=broad_leaf; type=conifer; type=coniferous. The usage of type=* for non-relation elements should be avoided. It seems this is the most extended non-relational usage of type=*, dedicated mainly to natural=tree.

There exist three undocumented tags trees=broad-leaved, trees=coniferous and trees=mixed. The tag trees=* is used for the kind of trees in orchards. The values broad-leaved and coniferous are mismatching. It seems these tags refers to a CORINE import in Spain.

There is no tagging for evergreen broadleaved plants (e.g. most trees in the rain forest), nor for deciduous needleleaved plants (e.g. larchs).

It is very complicated to include all combinations of leave type and phenology in one key, especially in consideration that the phenology is not common knowledge in every case.

We need two distinct keys to describe the type and phenology of leaves, suitable for all kind of plants and all kind of keys.

It is advantageous to use new keys, to avoid confusion with changing values of an already used key. The key wood=* will be deprecated. It seems there is no proposal nor approval for this key.

Tagging

Leaf type
Tag Comment Wide-view
picture
Close-up-view sample pictures
leaf_type=broadleaved Broadleaved vegetation. WaldAlfeld.jpg Fagus sylvatica leaf 001.jpg Feigenbaum im Frühsommer.jpg Virola sebifera.jpg ArichtiPalmTree.JPG
leaf_type=needleleaved Needleleaved vegetation.
Commonly coniferous.
Swiss National Park 131.JPG Picea abies Nadelkissen.jpg Larix decidua.jpg Dawn Redwood Metasequoia glyptostroboides Needles 3264px.jpg Calocedrus decurrens 7976.jpg
leaf_type=mixed Habitat with broadleaved and
needleleaved vegetation.
09272008 BrightonUT.JPG
leaf_type=leafless Leafless vegetation. Sentinel Peak Tucson Arizona.JPG Saguaro jul04 38.jpg Pachycereus weberi (1).jpg
Leaf phenology
Tag Comment Sample pictures
leaf_cycle=evergreen Plants that are never entirely without green foliage.

See Wikipedia evergreen on Wikipedia

Forests in Alberschwende 3.JPG Rain in Tena.jpg
leaf_cycle=deciduous Plants that are leafless for a certain period during the year.

See Wikipedia deciduous on Wikipedia

Bosco Chiesanuova (Grietz Dossetti Tinazzo) Lessinia VR Italy 2013-04-01 photo CTG ACA LESSINIA Paolo Villa 0081sp2.jpg Langaa egeskov rimfrost.jpg
leaf_cycle=semi_evergreen Plants that lose most, but not all, of their foliage for a fraction of the year. Subtropical semi-evergreen seasonal forest in Northern Thailand.JPG
leaf_cycle=semi_deciduous Plants that lose their foliage for a very short period,
when old leaves fall off and new foliage growth is starting.
Lucombe Oak (Quercus x hispanica 'Lucombeana' ) - geograph.org.uk - 1186259.jpg
leaf_cycle=mixed Habitat with evergreen and deciduous vegetation. Lahnberge Wald.jpg Chacachacare dry forest 3.JPG

The values relate to the Land Cover Classification System (LCCS) by FAO

The Global Forest Map (GFM) by UNEP-WCMC and the Global Land Cover 2000 Project by EU use the same terminology.

Applies to

Features/Pages affected

Comparison of tags
New tag Old tags
leaf_type=broadleaved wood=deciduous

wood=broad-leaved
wood=broad_leaved
type=broad_leaved
type=broad_leafed
type=broad_leaf
type=broad-leaved
type=broad-leafed
trees=broad-leaved

leaf_type=needleleaved wood=coniferous

type=conifer
type=coniferous
trees=coniferous

leaf_type=mixed wood=mixed

trees=mixed

leaf_cycle=evergreen wood=evergreen

type=evergreen

leaf_cycle=deciduous type=deciduous

type=deciduos

Current use

leaf_type=* leaf_cycle=*
wood=deciduous wood=coniferous type=broad_leaved type=conifer

Possible rendering

Rendering of woodland
Tag Rendering Comment Pictures
leaf_type=broadleaved Wood deciduous.png Broadleaved woodland. WaldAlfeld.jpg Aerial view of the Amazon Rainforest.jpg
leaf_type=needleleaved Wood coniferous.png Needleleaved woodland. Swiss National Park 131.JPG Pinus canariensis (Barlovento) 06 ies.jpg
leaf_type=mixed Wood mixed.png Mixed woodland. Mixed forest-Poland spring.jpg 09272008 BrightonUT.JPG
Signature for tree rows
Tag Signature Comment Picture
leaf_type=broadleaved Signatur Laubbaumreihe.png Broadleaved tree row. Birnbaumallee bei Hochosterwitz 01.jpg
leaf_type=needleleaved Signatur Nadelbaumreihe.png Needleleaved tree row. Bolgheri Viale dei Cipressi 001.JPG

Comments

Comments are welcome. Please keep the discussion on the discussion page.

Voting

The voting is finished. There are 27 approvals, 2 rejections, 3 abstentions. Therefore the proposal is approved. Thanks to all voters.

  • I approve this proposal I approve this proposal. --Rudolf (talk) 16:32, 23 May 2014 (UTC)
  • I approve this proposal I approve this proposal. --Janko (talk) 17:25, 23 May 2014 (UTC)
  • I approve this proposal I approve this proposal. Escada (talk) 18:07, 23 May 2014 (UTC)
  • I approve this proposal I approve this proposal. --Dieterdreist (talk) 18:57, 23 May 2014 (UTC)
  • I approve this proposal I approve this proposal. --Tordanik 21:07, 23 May 2014 (UTC)
  • I approve this proposal I approve this proposal. --PeeWee32 08:35, 24 May 2014 (UTC)
  • I approve this proposal I approve this proposal. --Nounours77 (talk) 13:49, 24 May 2014 (UTC)
  • I approve this proposal I approve this proposal. —seav (talk) 20:53, 24 May 2014 (UTC)
  • I abstain from this proposal. It has not been explained why common terms "broad-leaved" and "needle-leaved" should be written without a hyphen. I also wish to point out that, should this proposal be accepted, that will not be a license to make any automated tag changes to our existing database. --Frederik Ramm (talk) 06:38, 26 May 2014 (UTC)
There was no complaint about the syntax, therefore there is no explanation about it. The notation "broad-leaved" is used 194 times. The notation "needle-leaved" is used nowhere. I agree that this proposal is no license to automated mass-edits.
If you take a close look you can find the explanation in using the terminology of "LCCS by FAO". --Rudolf (talk) 07:50, 26 May 2014 (UTC)
The tag broad_leaved is actually used on over 300000 elements on OSM, broad-leaved on around 20000 (mainly the French CORINE import). See taginfo. SK53 (talk) 10:08, 6 June 2014 (UTC)
  • I approve this proposal I approve this proposal. Unixasket (talk) 09:39, 26 May 2014 (UTC)
  • I approve this proposal I approve this proposal. B108 (talk) 09:52, 26 May 2014 (UTC)
  • I approve this proposal I approve this proposal. LordOfMaps (talk) 09:53, 26 May 2014 (UTC)
  • I approve this proposal I approve this proposal.--Boscolindo (talk) 10:11, 26 May 2014 (UTC)
  • I oppose this proposal I oppose this proposal.--KK-O (talk) 11:15, 26 May 2014 (UTC) We have three main types of forest in geographie: deciduous,coniferous or mixed. If we want more details, we should name the trees in the forest by their botanical names, but this should be a part of a botanical database. The name wood=* in OSM is defined as the forest/wood-type and that is okay and everybody knows the OSM-meaning.
The values of "wood=" are ambiguous. It's the same to distinguish warm or heavy. Also it is impossible to tag evergreen broadleaved forests, which are main parts of the worldwide treecover. We cannot consider forests in Europe only. --Rudolf (talk) 12:31, 26 May 2014 (UTC)
  • I approve this proposal I approve this proposal. streckenkundler (talk) 13:26, 26 May 2014 (UTC)
  • I approve this proposal I approve this proposal. Seichter (talk) 14:34, 26 May 2014 (UTC) But I doubt whether this tagging will get widespread acceptance.
  • I approve this proposal I approve this proposal.--Geri-oc (talk) 06:40, 27 May 2014 (UTC) siehe aber Diskussion (Grundtags)
  • I abstain from this proposal. -- HillWithSmallFields (talk) 10:51, 27 May 2014 (UTC) I mostly like this proposal, but I don't like the leaf type values; not only would needle-leaved be better than needleleaved, but since the key already mentions that it is about leaves, I think the "leaf" word-element should be left out of the value, so I suggest the values should be simply "broad" and "needle"
The values "broadleaved" and "needleleaved" are consistent with the terminology of the "Land Cover Classification System (LCCS) by FAO". This system is used worldwide. --Rudolf (talk) 12:12, 27 May 2014 (UTC)
  • I oppose this proposal I oppose this proposal. I do not believe that this is a better way to distinguish between different types of wood.--Hfst (talk) 20:40, 27 May 2014 (UTC)
With the existing tags, a definite distinction is all but impossible. --Rudolf (talk) 06:24, 28 May 2014 (UTC)
  • I approve this proposal I approve this proposal. This is a good way to clean up our tagging mess. But once this gets accepted, you need to push on it: Templates in JOSM, iD, write map creators to implement it... I'm curious about how this will work out. --Derstefan (talk) 20:47, 27 May 2014 (UTC)
  • I approve this proposal I approve this proposal. --User:nyampire (talk) 06:46, 28 May 2014 (UTC)
  • I approve this proposal I approve this proposal. Javiersanp (talk) 08:32, 29 May 2014 (UTC)
  • I approve this proposal I approve this proposal. simlox (talk) 15:55, 29 May 2014 (UTC)
  • I approve this proposal I approve this proposal. Bulwersator (talk) 20:32, 4 June 2014 (UTC)
  • I approve this proposal I approve this proposal. --Surly (talk) 04:47, 5 June 2014 (UTC)
  • I approve this proposal I approve this proposal. --NetWormKido (talk) 06:52, 5 June 2014 (UTC)
  • I approve this proposal I approve this proposal. FreeExec (talk) 06:11, 5 June 2014 (UTC)
  • I approve this proposal I approve this proposal. -- and I suggest to add the "scaleleaved" value for cypress and many Cupressaceae plants BushmanK (talk) 06:31, 5 June 2014 (UTC)
This proposal follows the classification of the LCCS. It is advantageous to keep the values as simple as possible. --Rudolf (talk) 06:35, 6 June 2014 (UTC)
  • I approve this proposal I approve this proposal. Felis_Pimeja (talk) 06:11, 5 June 2014 (UTC)
  • I approve this proposal I approve this proposal. Ullus (talk) 10:31, 5 June 2014 (UTC)
  • I abstain from this proposal. I am wholly sympathetic to the objectives of this proposal, but am unconvinced that the specific tags here leaftype etc. are the best ones which can be used. In particular the existing wood=* has for many years provided basically the same concept. It has, of course, been polluted by wood=deciduous, a problem which needs to be resolved. As a botanist when I see leaf type I tend to think of terms like simple, crenate, entire, pinnate etc., not terms which relate to woodland. (leaftype can be used with trees, but if the species=*, genus=* or taxon=* are used this is redundant.) My feeling is that we should avoid creating new tags when what is needed is to improve the use of an existing tag, and that we should try when possible to find tag and key values which relate closely to normal speech. We talk about broad-leaved woodland, coniferous woodland, LaubWald, NadelWald, and so on which is why I my preference to keep wood for this purpose. Read Andy Allan's excellent description of what the issues are with changing tags. -- SK53 (talk) 10:08, 6 June 2014 (UTC)
As a "parallel inventor" of this scheme (I've started a couple of discussions and proposed almost the same variants of tagging), I can say, that it's impossible to improve/reorder the usage of "traditional" wood=*. First, literal meanings of values are orthogonal, not oppose to each other. And there is no way to tell everybody, that meaning was changed. Second, there is no way to find out, if some particular area was tagged with "old" meaning or "new" meaning (except some stupid thing like using "wood_meaning=new" flag, that is stupid). Third, I understand your point about leaf topology, but different sciences have different terminology.--BushmanK (talk) 23:24, 6 June 2014 (UTC)
  • I approve this proposal I approve this proposal. This is a better tagging system than the current one and kudos to Rudolf for this effort but this isn't the end of the story - we need to look at render/editor support, creating good examples and use cases and building and exploring edge cases. Copying the LCCS (which does have copyright) may be a good thing but no reason OSM has to stick with existing systems so we could amend to suit our needs in future. Also there's a question of what do we do with existing tags in OSM and writing more rendering rules...but don't get me wrong I support this but SK53 and others raise some important issues. --Hawkeyes (talk) 21:32, 6 June 2014 (UTC)