One thing to remember about postal codes is that they are a delivery mechanism 
first and foremost. Unless Canada Post has changed things, they don’t have a 
location, per se, because they’re based on postal walks (the route the postman 
walks). Most postal codes refer to something like 11 dwellings, except in the 
cases of large volume receivers (apartment buildings and large commercial 
receivers) and rural postal codes, so any spatial reference is rarely going to 
be 100% spatially accurate.

 

Cheers!

 

  --G

 

 

From: Adam Martin [mailto:s.adam.mar...@gmail.com] 
Sent: December 30, 2014 9:31 AM
To: Stewart C. Russell
Cc: talk-ca@openstreetmap.org
Subject: Re: [Talk-ca] Adding Buildings + Leisure + Corrections To Ottawa Map 
Over Holiday Season

 

Hey Russell / all,

I performed a rudimentary test of an address in the map without a postal code 
and later used the Nominatim to search for it to see what it produced. The 
address was 27 Cairo Street in St. John's, NL - I used this because it is an 
old address of mine and I know the postal code there without reference to 
Canada Post or the like. The result from Nominatim is A1B 3X9. The actual 
postal address is A1C 4X2 - a significant difference. I don't believe that the 
postal data in Geocoder is particularly accurate.

Adam

 

On Tue, Dec 23, 2014 at 6:11 PM, Stewart C. Russell <scr...@gmail.com 
<mailto:scr...@gmail.com> > wrote:

On 2014-12-23 12:27 PM, Richard Burcher wrote:
> - I've removed the mention of postcode collection. I'm not sure of the
> legal aspect of collection as raised in an earlier thread.
>

I've found that if you add an address without a postal code, then query
Nominatim later, it returns the postal code. I suspect geocoder.ca 
<http://geocoder.ca>  data
is involved somewhere along the way.

cheers
 Stewart



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