[talk-au] LPI Base Map - green areas ?

[Nev Wedding]

> On 17 Jan 2016, at 1:50 PM, Warin <61sundowner at gmail.com> wrote:
> 
> On 17/01/2016 1:12 PM, Nev Wedding wrote:
>> On 17 Jan 2016, at 11:28 AM, Andrew Davidson <u887 at internode.on.net> wrote:
>>> On 16/01/16 11:47, Nev Wedding wrote:
>>>> Though I don’t know the area you refer to, I feel landuse=water_catchment is an excellent choice and is the correct tag for an area that has a capture of water as specific defined use as already stated on https://www.wyong.nsw.gov.au/getmedia/7ca695e8-748d-4bca-beba-3b7bff8296e4/Mangrove-Creek-Dam-Brochure.pdf.aspx
>>>> …says ‘Mangrove Creek Dam Catchment’
>>> The problem is that the area we are talking about is not the area in the map you've linked to.
> 
> It is at least a substantial proportion of it.
> Note that the map also has the 'Mangrove Creek Weir Catchment' area that has a similar colour, abuts one boundary
> and some others areas (those are better differentiated colour wise) too.
> 
>>> What we are talking about is a sub-section of that area that has been protected for the purposes of drinking water supply.
>>> 
>> I don’t see any problem with tagging a sub-section of the water catchment in a special way, with added tag restrictions if considered appropriate.
>> The landuse=water_catchment does not imply that you have encompassed the entire catchment.
>> If naming as ‘Mangrove Creek Dam Catchment’ would imply the entire area.
> 
> A roadway can be tagged in subsections. Even if a subsection is omitted .. the remainder are valid entries and each sub section carries the name.
> I don’t agree with the asserted 'implication'.

Yes, I think you are correct
> 
>> 
>> I see that individually mapped rural private properties may have portions of each property reserved as protected water_catchment in the future as the country becomes more over populated.
> 
> In the UK many farms are in 'water catchment' areas.
> This is a problem for tagging 'landuse' .. many areas are used for more than one thing.
> A solution may come out of development of other tags by the tag tagging group (ref RFC - Discourage amenity=public_building).
> 
> If you want to explore what is going on in the UK .. a starting point is http://environment.data.gov.uk/catchment-planning/
> 
> A possibly shorter start would be https://www.nwl.co.uk/your-home/environment/catchment-management.aspx
> Basically  they want any run off or sub soil water to be up to a certain standard, not carrying too much pollution within the water catchment area.
> 
> 
>> 
>>>> 
>>>> Another I like is reservoir_watershed
>>>> 
>>>> 
>>> Three problems:
>>> 
>>> 1. OSM tags are traditionally based on UK English so that'd have to be
>>>  reservoir_catchment
> 
> Some don't have a reservoir but simply use the local river/s (e.g. see https://www.nwl.co.uk/your-home/environment/catchment-management.aspx).
> 
> So reservoir_catchment does not 'work' for all.
> 
> "Water Catchment" is used in the UK http://www.ofwat.gov.uk/wp-content/uploads/2015/11/prs_inf_catchment.pdf
> 
> watershed? One definition; and area or ridge of land that separates water flowing into different rivers. So that definitely does not fit.
> 
> 
> 
> 
>>> 2. This tag has already been used in a bulk import of data for
>>>  Massachusetts where I assume it means something in Massachusettsan law
>>> 3. Implies that this represents the entire catchment of a reservoir but
>>>  we're only talking about a sub-section here.
>>> 
>> Yes, I agree that reservoir_watershed and reservoir_catchment implies the entire catchment representation.
> 
> highway=motorway ... implies the entire motorway?
> 
> I don't think so.
> 
> Some are tagging individual farm fields ... that are not the entire farm.
> I don’t 'see' the implication that any tagged area or way has to be the entire thing even if named.

Agreed :)

> 
> 
> 
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