[Talk-GB] What is farmland?

[Gareth L]

I’m all for using a polygon per field, but am unsure what to do at the boundaries. Do I make 2 field polygons meet? Or leave a gap as there’s a track/hedge/fence/small coppice/ ditch/drain ? I’m probably not going to be able to map the boundary particularly accurately in a first pass, so would rather omit than put in inaccurate barriers 

Any suggestions?

Gareth 

> On 16 Dec 2019, at 11:38, Tony OSM <tonyosm9 at gmail.com> wrote:
> 
> Mapping Fields - preferred method I think is individual fields, or at least polygons which are based on road or natural boundaries. Mea Culpa - I have also mapped farmland as larger polygons.
> 
> Large polygons make life difficult when a field changes use - near where I live it becomes scrub for several years before being developed for housing/industrial/retail.
> 
>> On 16/12/2019 10:21, Philip Barnes wrote:
>>> On Monday, 16 December 2019, David Groom wrote:
>>> ------ Original Message ------
>>> From: "Dave F via Talk-GB" <talk-gb at openstreetmap.org>
>>> To: talk-gb at openstreetmap.org
>>> Sent: 14/12/2019 15:54:13
>>> Subject: Re: [Talk-GB] What is farmland?
>>> 
>>>> On 14/12/2019 15:19, Martin Wynne wrote:
>>>>> Is this "farmland"?
>>>>> 
>>>>>  http://85a.uk/haws_hill_960x600.jpg
>>>> I would say yes, as I believe both arable & livestock is farmland.
>>>> 
>>>> I concur with your frustration about 'huge multi polygons', especially when joined to other features such as roads & rivers. I believe a few mappers were keen to fill in the gaps rather than map accurately. Personally I think there should be one polygon per field, but I admit that makes for a lot more work.
>>>> 
>>> I see no benefit to mapping individual fields as separate polygons
>>> tagged as farmland if adjacent fields are also farmland. Could you
>>> explain why you think this is best?
>>> 
>>> David
>>> 
>> Large polygons make future editing very difficult.
>> 
>> It is very beneficial to differentiate between arable, pasture and hopefully we can get real meadow back from the misuse it has received.
>> 
>> Farming use changes, mapping individual fields allows farmland types or other changes to be maintained far easier than if it is part of a huge polygon.
>> 
>> All in all it goes to make for a better more usable map.
>> 
>> Phil (trigpoint)
> 
> _______________________________________________
> Talk-GB mailing list
> Talk-GB at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-gb