Re: [Tagging] Farmlands subject to rotation of crops

[Warin]

On 22/7/20 12:53 am, Michael Montani wrote:

Dear all,

I wanted to check with you which is the best way to map farmlands 
subject to rotation of crops. An example could be of a farmland used 
for general crop in one part of the year and left it at rest for the 
remaining part of the year, being actually used as a meadow for 
animals grazing there.


Which would be the best way to tag such area?




landuse=farmland

Optionally add?
description=crop rotation
produce=crop (this is non specific... possibly add detail with 
produce=wheat,barley,crop is specific crops are known?)

comment=crop rotation

When a field is fallow then I would not use farmland=meadow as this is 
incorrect ... unless it is truly used as animal grazing or harvesting 
the plants. Some crop lands are used after harvesting from grazing of 
animals but this is a temporary thing that is a small percentage of the 
time, so I don't map it.. too much to keep upto date and that would be 
confusing for maps that don't update on a weekly basis.




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Re: [Tagging] Farmlands subject to rotation of crops

[Joseph Eisenberg]

I agree that the information "crops are rotated in this field" is not
verifiable, because it is recording historic information about what
happened the last few seasons, rather than what is in the field right now.

It is ok to tag the crop that is currently planted in a field, especially
if it's a perennial crop which will be the same for several years. Even if
it is only an annual it might be semi-permanent: rice terraces are used to
plant rice every season, because they are specially designed and irrigated
for that purpose, for example. And if a mapper wants to add information on
the current crop this year, this is fine too: though it might require
updating each year.

I've previously asked about a tag for farmland (cropland) which is
currently fallow. If it's been fallow for a while, usually grasses or other
semi-natural vegetation will grow back (in most climates), and it can be
tagged as landuse=meadow (even if it's not used for hay or grazing). But
before that, it's not clear if there is a tag for cropland that is
unplanted and temporarily fallow for a few months to 1 year.

- Joseph Eisenberg

On Wed, Jul 22, 2020 at 2:57 AM Mateusz Konieczny via Tagging <
tagging@openstreetmap.org> wrote:

>
>
>
> Jul 22, 2020, 11:33 by dieterdre...@gmail.com:
>
>
>
> sent from a phone
>
> On 22. Jul 2020, at 10:36, Volker Schmidt  wrote:
>
> I would go with farmland, orchard, vineyard and not even consider
> indicating any rotation of crops.
>
>
>
> +1, these are also those that I distinguish, because annually sown crops
> are subject to frequent changes, while you typically will keep vineyards
> and orchards for many years.
>
> +1, I would consider crop rotation tagging as historic unverifiable data
> and therefore out of scope of OSM
>
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Re: [Tagging] Farmlands subject to rotation of crops

[Mateusz Konieczny via Tagging]

Jul 22, 2020, 11:33 by dieterdre...@gmail.com:

>
>
> sent from a phone
>
>> On 22. Jul 2020, at 10:36, Volker Schmidt  wrote:
>>
>> I would go with farmland, orchard, vineyard and not even consider indicating 
>> any rotation of crops.
>>
>
>
> +1, these are also those that I distinguish, because annually sown crops are 
> subject to frequent changes, while you typically will keep vineyards and 
> orchards for many years.
>
+1, I would consider crop rotation tagging as historic unverifiable data and 
therefore out of scope of OSM

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Re: [Tagging] Farmlands subject to rotation of crops

[Martin Koppenhoefer]

sent from a phone

> On 22. Jul 2020, at 10:36, Volker Schmidt  wrote:
> 
> I would go with farmland, orchard, vineyard and not even consider indicating 
> any rotation of crops.


+1, these are also those that I distinguish, because annually sown crops are 
subject to frequent changes, while you typically will keep vineyards and 
orchards for many years.

Cheers Martin 
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Re: [Tagging] Farmlands subject to rotation of crops

[Volker Schmidt]

This is a rather tricky problem, especially as the changes may not follow
any particular pattern.
I am not a crop mapper at all, but I can distinguish between the major
local crops (in Italy). And in many cases the mapping in OSM is wrong,
mostly because the data is fruit of imports which were too specific.
One effect which is noticeable around here is not rotation, but that the
crops tend to follow patterns like market prices, or subsidies by the EU.
There are exceptions, like corn (mais) which normally does not change. So
my experience with precise crop mapping is that very often it is simply
wrong.
There are obvious exceptions, like orchard (fruit, olives), and vineyards.
But most annually sown crops may change easily, and the average OSM mapper
does not update crops. I would go with farmland, orchard, vineyard and not
even consider indicating any rotation of crops.

That does not exclude making a special effort in certain areas, provided
you have the trained mappers.

On Tue, 21 Jul 2020 at 17:13, Michael Montani 
wrote:

> Dear all,
>
> I wanted to check with you which is the best way to map farmlands subject
> to rotation of crops. An example could be of a farmland used for general
> crop in one part of the year and left it at rest for the remaining part of
> the year, being actually used as a meadow for animals grazing there.
>
> Which would be the best way to tag such area?
>
> Thanks,
>
> --
> *Michael Montani*
> GIS Consultant, *Client Solutions Delivery Section*
> *Service for Geospatial Information and Telecommunications Technologies*
> United Nations Global Service Centre
> United Nations Department of Operational Support
>
> Brindisi | Phone: +39 0831 056985 | Mobile: +39 3297193455 | Intermission:
> 158 6985
> E-mail: michael.mont...@un.org  | www.ungsc.org
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[Tagging] Farmlands subject to rotation of crops

[Michael Montani]

Dear all,

I wanted to check with you which is the best way to map farmlands subject to 
rotation of crops. An example could be of a farmland used for general crop in 
one part of the year and left it at rest for the remaining part of the year, 
being actually used as a meadow for animals grazing there.

Which would be the best way to tag such area?

Thanks,

--
Michael Montani
GIS Consultant, Client Solutions Delivery Section
Service for Geospatial Information and Telecommunications Technologies
United Nations Global Service Centre
United Nations Department of Operational Support

Brindisi | Phone: +39 0831 056985 | Mobile: +39 3297193455 | Intermission: 158 
6985
E-mail: michael.mont...@un.org | 
www.ungsc.org
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