[Tagging] Tagging Digest, Vol 108, Issue 162

Colin Smale colin.smale at xs4all.nl
Sat Sep 29 08:18:24 UTC 2018


river_feature would be fine as well as it would imply that it doesn't
need to be a linear feature, a node would also be OK (for small named
bays etc?)

Lets have a go at agreeing the basic principles of what we are trying to
achieve.  

* there can be contiguous linear sections of a river which can have
names 
* there can be small features with names, such as small bays which can
better be represented by a node 
* they can be "straight" (for example "reaches") or "curved" (for
example "bends") 
* they can (partially) overlap each other, and there may be gaps (there
may not be a clear, sharp transition from one section to the next) 
* in the case of linear feature, they encompass the entire width of the
river and are not just a 2D line 
* for "river", read (river OR stream OR drain OR...) 

This is pointing towards: 
* a way along the centre line of the river (colinear with the
main_stream lines?) OR a node for smaller / non-linear features 
* waterway=river_feature 
* river_feature={reach,bend,bay,...} 

* name=* 

I would like this to be applicable to lakes as well (why not?) but it's
difficult to see how a linear feature would apply to a lake. Any
comments? 

There was a suggestion that we should re-use existing flow lines and not
superimpose new ways. This would not allow for the fact that two linear
features may overlap - the end of a "bend" may overlap with the first
bit of a "reach" for example. The extent of these features may be well
defined, but they may not be so sharp. My thought is that this freedom
to allow overlaps is important. Any comments? 

On 2018-09-29 00:11, Graeme Fitzpatrick wrote:

> On Sat, 29 Sep 2018 at 06:32, Colin Smale <colin.smale at xs4all.nl> wrote: 
> 
>> The point of raising the "reach" business it to help abstracting the proposed tagging model to make it more generic. If we consolidate all the thoughts expressed so far, we can say that:
>> 
>> * there can be contiguous linear sections of a river which can have names 
>> * they can be "straight" (for example "reaches") or "curved" (for example "bends") 
>> * they can (partially) overlap each other, and there may be gaps (there may not be a clear, sharp transition from one section to the next) 
>> * they encompass the entire width of the river and are not just a 2D line
> 
>> This is pointing towards: 
>> * a way along the centre line of the river (colinear with the main_stream lines?) 
>> * waterway=river_section 
>> * river_section={reach,bend,...} 
>> * name=*
> 
> Liking your train of thought Colin. 
> 
> Just wondering, perhaps =river_feature? 
> 
> I'm not certain about "they encompass the entire width of the river" though? Would that then exclude things like _"The Deep Hole"_ & _"17 Mile Rocks"_, which are both named spots that I can point out on a map? 
> 
> Thanks 
> 
> Graeme  
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