[HOT] [Tag] landuse=residential in rural and urban areas

Pierre Béland pierzenh at yahoo.fr
Sun Nov 23 15:08:39 UTC 2014


We can take care of this once the job is completed. It is easy with the Ovepass query service to extract all [landuse=residential] and fix this, deciding how to group some of the smaller areas.
 Pierre 

      De : althio forum <althio.forum at gmail.com>
 À : HOT Openstreetmap <hot at openstreetmap.org> 
 Envoyé le : Dimanche 23 novembre 2014 9h48
 Objet : Re: [HOT] [Tag] landuse=residential in rural and urban areas
   
Following the discussion in [HOT] [Tag] #767 - Mali, Bamako
and merging some points here in [HOT] [Tag] landuse=residential in
rural and urban areas

Pierre Béland <pierzenh at yahoo.fr> wrote:
> In urban areas, we shoud simply have a large polygon
> around the urban area and not cut at each street.
I have seen also that the instructions were updated with "In Bamako,
do not trace small polygons for each section of houses between
streets. A large polygon [covers] the city."
A few comments:
* I think this is a good addition, thank you.
* Minor edit: I guess 's' is missing in cover[s].
* Minor trouble: I could not find the one large polygon that covers the city.

What do we do now with the existing smallish landuse=residential
inside Bamako? Do we leave them? Do we remove them while mapping or
reviewing or do we wait after next-level validation?

Tom Taylor <tom.taylor.stds at gmail.com> wrote:
> My own practice for large urban areas (last experience was a Canadian city
> rather than a HOT task) is to carve them up into multiple
> landuse=residential areas, bounding them on roads or other landuse types.
Tom, thank you for your insight, I can see even in Bamako that other
people follow your practice. It can be very nicely done but I find it
hard to get homogeneous mapping and according to the following
statement it seems like extra work but not immediately useful:
Pierre Béland <pierzenh at yahoo.fr> wrote:
> If you trace a large residential polygon,
> and inside it small polygons for schools, hospitals or any other landuse,
> you do not need to cut everything.
> The Map Renderers should know how to interpret this.

althio

althio wrote:
>
> My previous message leads me to a more generic question.
>
> In http://tasks.hotosm.org/project/767 and maybe some other project,
> the instructions reads:
> "Settlements:
> Trace polygon around clusters of houses. Tag with landuse=residential"
>
> I feel these instructions are related to rural areas. They can be
> misunderstood in the context of urban areas. In this project we are
> also mapping inside Bamako, very urban and very dense.
>
> What about urban areas? What is the good pratice, the recommended size
> for landuse=residential in Bamako and other African big cities?
> * Only one huge outline landuse=residential around the whole city
> * By neighborhoods?
> * Cut by main roads (arteries of the city)
> * Block by block
>
> As I map and review I see almost every case.
>
> Has this been discussed or documented already?
>
> althio



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