[Tagging] [Talk-bf] Buildings blocks

Jean-Marc Liotier jm at liotier.org
Wed Mar 11 13:59:55 UTC 2015


On 11/03/2015 13:25, althio wrote:
> I do not have the answer but I wanted to look towards place=* tagged as area.

I like that approach - it will let us position this entity within the 
existing frame of concentric urban territorial subdivisions.

> place=block [taginfo ~1 200 as area] [no wiki]
> place=city_block [taginfo ~900 as area] [wiki documentation, mostly in
> Stockholm, Sweden]

Too big: looking at http://i.imgur.com/jbIe1vB.png shows that the city 
block encompasses eight to ten of the entities we seek to tag - numbers 
may of course vary worldwide, but the hierarchy will be the same.

> place=neighbourhood [taginfo ~7 000 as area] [wiki, requires name
> according to documentation]

Too big - even more than the block since is a neighborhood might 
encompass several blocks.

> place=plot [taginfo ~900 as area] [no wiki]

I like that one a lot - looks very promising to me !

And look at http://www.openstreetmap.org/way/287224897 - it looks like 
UNHCR in Jordan follows the same line of thinking:

addr:postcode=JORZARV06B10P10
admin_level=10
bid=B10
blocdesc=Block 10
boundary =administrative
gid=271
name=Plot 10
pid=P10
place=plot
refugee=yes
vid=V06
vildesc=Village 6

I object to admin_level=10 since 
http://wiki.openstreetmap.org/wiki/Tag:admin_level%3D10#11_admin_level_values_for_specific_countries 
most often uses that for place=neighbourhood but apart from that it 
looks very similar to what we want to model. I would rather chose 
admin_level=11 which is not documented - though it has 4355 occurrences 
(http://taginfo.openstreetmap.org/search?q=admin_level%3D11)

In the same reasoning I mentioned for not considering place=block and 
place=city_block, it has blocdesc=Block 10 (which incidentally has a 
strong smell of UNHCR proprietary tagging - someone tell them that 
place=block and place=city_block exist ?)

Let's look at how it looks like on the ground: 
http://i.imgur.com/Ai2KgcB.png - it is in a refugee camp, but I'm 
convinced it is the same concept (and the way the Syrian conflict is 
going, come back in five years and it will look exactly the same as the 
Senegal example).

Or look at "Mama Muga's Plot" in Kibera : 
http://www.openstreetmap.org/node/612007108 - definitely the concept we 
have been discussing, mapped as place=plot

As a bonus, it has some degree of kinship with the concept of 'cadastral 
plot' which is its more administrative cousin.

Color me convinced - place=plot has my vote !




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