[talk-au] Victorian Vicmap Address Import Proposal

Sebastian S. mapping at consebt.de
Thu May 20 10:52:37 UTC 2021



On 20 May 2021 8:00:54 pm AEST, Andrew Davidson <theswavu at gmail.com> wrote:
>On 19/5/21 2:48 pm, Andrew Harvey via Talk-au wrote:
>
>> 
>> 2. Should we also import `addr:suburb`, `addr:state` and
>`addr:postcode` 
>> tags? I'm proposing we do.
>
>Please don't do that. Now that we have a complete set of admin_level 10
>
>boundaries in Australia addr:suburb is now redundant.
>
I agree in theory but I'm practice this does not work.
I don't get the full address of a POI when checking in OSMAnd or other consumers, I only get a partial address which is not correct or complete.

We have also agreed to include +61 and 2 (area code) in phone numbers. The same argument could be applied here right?

>> Given postcode regions aren't mapped, then adding these to the
>address 
>> should be very helpful.
>
>Postcodes can be added once to the level 10 admin boundary or as a 
>separate postal_code boundary if they don't align.
>
>> `addr:state` is less important given these addresses fall within the 
>> Victoria state admin boundary already. The wiki touches on this
>saying 
>> "A few mappers consider higher-level tags, or even addr:city=* as 
>> redundant, since they could be calculated from the respective
>boundary 
>> relations they are contained in (if present and valid). However, such
>
>> practice has severe disadvantages and can lead to wrong results."
>
>If you read the explanation on the talk page this does not apply to 
>Australia because we have contiguous postal areas.
>
>> Either way, I don't think it matters too much, but since it's not 
>> harmful to include, and might provide some benefit, then we may as
>well 
>> include `addr:state`?
>
>It is actually harmful because you have to maintain the same piece of 
>information in thousands of places. Not only that having multiple 
>sources of information seems to confuse Nominatim. On the other hand 
>adding it has no real benefit, so I would suggest that you don't import
>

Again I think this argument is misleading.
What kind of maintenance do you anticipate for post code and locality?
While I see plots of land being split and getting new a house number, the probability of street name changing is much lower. Locality and post code even less likely in my opinion.
Fabricated scenarios of such as Narrabeen and north Narrabeen getting different post codes. Unlikely I would say.

>anything beyond the street name.
>
>> 3. `addr:suburb` vs `addr:city`.
>
>The addr:city is for countries where the postal address has the concept
>
>of a postal city. As we don't have that in Australia then we don't need
>
>to have this tag.
>

Thanks for this explanation

>> 
>> Both tags are in use within Australia. According to taginfo 
>>
>(https://taginfo.geofabrik.de/australia-oceania/australia/search?q=addr%3A
>
>>
><https://taginfo.geofabrik.de/australia-oceania/australia/search?q=addr%3A>)
>
>> within Australia addr:suburb occurs 521 ,671 times and
>addr:city 562,542 
>> times.
>
>About 99.99+ % of those addr:city are from the Brisbane address import 
>and I would view that as a mistake rather than a reason to perpetuate 
>this elsewhere.

I tend to agree

>
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