User:Mashin/Rapids unification
Rapids | |
---|---|
Proposal status: | Draft (under way) |
Proposed by: | Mashin |
Tagging: | water=rapids
|
Applies to: | ![]() ![]() ![]() ![]() |
Definition: | A unifying system for rapids and whitewater features mapping. |
Statistics: |
|
Draft started: | 2021-11-27 |
RFC start: | n/a |
Vote start: | n/a |
Vote end: | n/a |
Background
Rapids are sections of rivers where riverbed has a relatively steep gradient and water flows through with increased velocity and turbidity. Knowing details about rapids ahead is essential for safe practicing of water sports.
Currently, several mapping approaches exist that cause conflicting situations with other water features or duplication of objects. This proposal aims at providing an amendment to the tagging suggestions in order to achieve:
- Simple and intuitive guideline
- Provide solution with minimal impact on current tagging and with little requirements for modification of already existing features.
- Maintain consistency and spirit of established water features tagging.
- Remove practice of creating duplicated features.
Proposed solution
Linear (Point) features
Primary way of tagging rapids is proposed to draw as a line feature along the median of a river section and tagged as
waterway=rapids
.
Alternatively: by placing a new node on
waterway=river
line and adding tag waterway=rapids
.
Explanation:
- This is consistent with tagging of routable water features and obstacles as
waterway=*
- Rapids
waterway=rapids
line should not duplicate or overlap withwaterway=river
line, but rather be inserted between twowaterway=river
lines. - Rapids line should be inserted into Relation:waterway to preserve river connectivity.
- Additional optional tags can be applied to rapids line or point:
- point:
whitewater:rapid_name=*
,whitewater:rapid_grade=*
- line:
whitewater:section_name=*
,whitewater:section_grade=*
- Note: Previously there has been an attempt to have single set of tags for both points and lines
whitewater:name=*
,whitewater:grade=*
. See 1, 2
- point:
Area features
Full area of water rapids are to be mapped as closed way tagged with
natural=water
+ water=rapids
.
Explanation:
- This is consistent with currently popular tagging of water areas as
natural=water
+water=*
- Rapids
water=rapids
area should not duplicate or overlap withwater=river
area. This is similar to the rationale thatwater=reservoir
areas do not overlap withwater=river
area of river that flows through the reservoir. - No additional tags such as name are necessary as those are part of linear (point) features.
Effect on existing features
waterway=rapids
nodes: Remain valid features.waterway=rapids
lines: Remain valid features. If overlapping withwaterway=river
line, the duplicatewaterway=river
section should be removed.waterway=rapids
areas: To be retagged asnatural=water
+water=rapids
. Other tags preset on area should be moved to line feature. Overlapping part ofwater=river
should be removed.whitewater:*=*
nodes & lines: Addwaterway=rapids
tag.
Examples
Features/Pages affected
Tag:water=rapids, Tag:waterway=rapids, Whitewater sports, Proposed features/Key:whitewater:grade, WikiProject Whitewater Maps/Proposals
External discussions
Please comment on the discussion page.