[Tagging] landuse=farmland and highway=track

[Dave Swarthout]

Haha, welcome to the club. This is a problem everyone faces. Here in
Thailand I spend a lot of time breaking up large wood multipolygons because
in the early days folks did not take the time to do it right. Woods do not
cover highways (unless its a farm track) nor do they cover water features
like river valleys or reservoirs. I can tell you this, it's a lot of work
either way you decide to do it but future mappers will thank you if you do
it properly in the first place.

I have found the Fastdraw plugin to be helpful but only if you're wanting
to follow outlines accurately. The tool takes a while to master and it
creates many more nodes than would just a quick outline. Take for example
an area I just "enhanced" - the wood polygon north of the junction of 1045
and 1047 was originally comprised of about 12 nodes. After I traced the
southern edge of the wood more closely, it now contains 966 nodes. Imagine
how many nodes and how much time would be required to do all the wood
multipolygons worldwide. It's off-putting to say the least.

http://www.openstreetmap.org/search?query=%2017.7009941%2C%20100.6239762#map=15/17.6990/100.6190

It looks better and is more accurate but takes up a lot more space on the
server. And it took a few patient minutes to trace. YMMV

Cheers,
Dave
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On Sun, Jan 10, 2016 at 3:21 PM, Gerd Petermann <
GPetermann_muenchen at hotmail.com> wrote:

> Hi all,
>
>
> I am currently (armchair) mapping rural areas in Japan, that means
> realigning nearly all
>
> existing ways.
>
>
> Whenever I am mapping landuse=farmland areas I wonder whether I should
>
> 1) draw one rather large polygon stretching across all highway=track ways
>
> and small buildings which are likely used by the farmer and waterway=ditch
> ways or
>
> 2) draw small polygons so that none of these objects is "covered".
>
>
> Obviously option 1) is easier and results in rather few landuse polygons
> while 2) is
>
> much more work and results in many typically nearly rectangular shapes.
>
>
> My current approach is this:
>
> a) I prefer NOT to draw landuse polygons across a major highway or a track
> with tracktype=grade1.
>
> b) When a building looks like a building=barn I prefer to think of it as
> part of the farmland .
>
> (I am always unsure about greenhouses on farmland.)
>
> c) I also think of ditches (not going along roads) as part of farmland, so
> I draw polygons across them.
>
>
> My problem: When I start to draw these polygons I feel an urge to complete
> the work,
>
> and that can be quite time consuming ;-)
>
>
> Is there a tool for this ? Maybe a plugin for JOSM ?
>
> Or maybe I should go more in direction of option 1)  first and let locals
> do the details ?
>
>
> Gerd
>
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>


-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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