[Talk-GB] Google maps added addresses!

ipswichmapper at tutanota.com ipswichmapper at tutanota.com
Mon Dec 28 20:11:35 UTC 2020

Using streetcomplete requires accurately drawn buildings with building=house tag and they have to be terraced properly. Often this isn't done. I wrote about streetcomplet compatible taggong as well as how to draw buildings quickly in a guide I made (post on the user diaries) , however more users, especially experienced/intermidiate users of JOSM need to know about this.


28 Dec 2020, 17:33 by frederik at remote.org:

> Hi,
> On 12/28/20 17:21, Rob Nickerson wrote:
>> What can we do to improve coverage of addresses in OSM? I notice that we
>> have some pretty good aerial imagery now. Should we see if we can get
>> good building outline from an AI / machine learning approach? If the
>> quality is good we can then use these to help add addresses. For example
>> we can ask new mappers to add addresses using tools such as StreetComplete.
> From my personal experience it definitely helps to have building
> outlines if you want to record addresses, however my recording of
> addresses very frequently required making changes to the pre-existing
> building outline - most frequently, splitting a terraced building into
> individually addressed parts, but sometimes also more complex merges and
> splits because the situation that presents itself from the air is
> different to what you see when standing before the building.
> I doubt that getting building outlines from an AI process will help more
> than it hurts; firstly because they are usually not "good", secondly
> because even good building footprints will create problems if e.g.
> streets, solar panels or other things have been created based on
> different imagery and will now (in the case of streets) overlap with, or
> (in the case of roof solar panels) lie outside of the building
> footprint. I think you will achieve better overall map quality when
> mappers trace building outlines manually.
> The bulk of this work is surveying the house numbers; tracing the
> buildings on top of that adds just a few percent extra work. I can trace
> 1,000 buildings in a lazy evening while watching a film, but I need
> weeks to record that many house numbers...
> Bye
> Frederik
> -- 
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
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