[HOT] HOT carto, Re: Buildings and residential areas: Buldings as nodes (Q1)

[Andrew Buck]

The real solution is to "upgrade" these nodes into properly mapped
buildings with a way.  We really should be discouraging people mapping
as nodes like this as it is largely a waste of time since someone has to
map it as a way later on anyway and when they do they either need to
delete the existing nodes or merge them into the buildings to preserve
history (but also taking much longer).

Adding renderings to maps only encourages people to take the easy way
out in the short term and create more bad data.  We should not encourage
this and should be actively trying to fix the nodes already in the
database.  I have done this on a few occasions and have probably knocked
out a few thousand of them, but unless we get serious about cleaning
them up we will end up with more and more of them.

Buildings as nodes is not a recognized way of mapping them that has
broad support.  Almost without exception the only people doing this are
newbie HOT mappers who don't know the correct procedure.  So this is a
mistake that should be fixed, just like non-square buildings or
unconnected roads.

-AndrewBuck


On 05/25/2017 04:09 AM, Bjoern Hassler wrote:
> Hi all,
> 
> just to follow up on the buildings discussion - it seems that it's not
> likely that node-buildings will be rendered in the standard cartography,
> see https://github.com/gravitystorm/openstreetmap-carto/issues/806.
> 
> However, I think there is a case for rendering node-buildings in the HOT
> cartography? I'll file a suggestion here: https://github.com/
> hotosm/HDM-CartoCSS.
> 
> Bjoern
> 
> On 23 May 2017 at 04:54, Rob Savoye <rob at senecass.com> wrote:
> 
>> On 05/22/2017 01:44 PM, john whelan wrote:
>>
>>> consider and it is a major part of engineering.  No matter what
>> compression
>>> system is used four nodes will always take up four times the space as one
>>> node.  Maybe not with .7z compression looking for strings in the long lat
>>> but its a good rule of thumb.  Again OSM is now running the largest
>>> database known in whatever it is running in, I forget the name.  It's
>>
>>   OSM uses PostgreSQL with the postgis and hstore extensions. I run it
>> locally to save on bandwidth latency, plus it works offline too cause
>> connectivity is poor around here. Mobile bandwidth is getting better all
>> the time all over the planet though. Adding data to OSM is better to be
>> done the way most others do it than worrying about bandwidth.
>>
>>   Looking into a few OSM files, I see <node> used as a building that
>> hasn't been mapped as a polygon, ie.. just a waypoint. That's useful
>> enough for most people trying to find someplace. For a building that
>> actually has it's dimensions mapped, then it's a <way>, with references
>> to each <node>. It depends what type of info you want from your map.
>> When generating a display map, a <node> won't appear as a building,
>> it'll just be a cute icon. If you want to see a whole building shape, it
>> needs to be a <way>. Some buildings have both.
>>
>>         - rob -
>>
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> 
> 
> 
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