[Imports-us] Leveraging MassGIS L3 Parcel files for assisting in manual address merging

Frederick Hunter fhunterz at verizon.net
Sun May 24 03:18:07 UTC 2015

Hi Lars,

Thanks for the reply. I hadn't realized that imports of address data was
being held off in anticipation of a possible more complete MassGIS

Am I correct in understanding that it would be better to not add address
data for now in hopes of making a future import of addresses easier? 

In regards to your questions, what I have done so far for parcels with
multiple buildings (or address ranges), was to add the address to the
house using the Bing aerial view for confirmation. If there are many
buildings, such as a new development, I will not add addresses to any of
the buildings either.


Am Samstag, den 23.05.2015, 21:01 -0400 schrieb Lars Ahlzen:
> Hi Frederick!
> First of all, kudos for working on much needed address data in OSM!
> At a cursory glance, it looks pretty good from a technical standpoint.
> I do think that even if it's done semi-manually and fractions of a
> town at a time, it's still an import and should probably follow the
> import guidelines. That's a good checklist for making sure you get
> things right anyway (which is surprisingly hard!).
> We do have some locals here in MA with lots of experience of imports,
> and who are also familiar with that particular dataset, that may be
> able to provide some additional feedback as well.
> That said, I would like to take a step back to make sure importing
> addresses from the MassGIS L3 Parcel data is our best option. While I
> frequently use it for determining hard-to-survey boundaries, I have
> some questions about its usefulness as an address source:
> As far as I know there are still towns/cities in MA, such as the city
> of Boston, for which L3 data is not (yet) available. I realize you're
> not necessarily proposing an import of the whole state, so it may not
> matter in your case. However, scattered address data is less useful
> than a state-wide import (though, I suppose, better than nothing).
> The L3 data has, as far as I know, a single address or address range
> per land parcel. I'm sure that's fine in most places, but I imagine it
> can lead to some tricky cases in denser areas. For example, I could
> find several examples of one parcel with multiple buildings and a
> range of house numbers. In that case, how would you do the mapping
> from house numbers to buildings? What about a parcel with one house
> number and multiple buildings?
> Also, there's a rumor that MassGIS is going to release proper address
> data with a compatible license. In fact, that is probably the main
> reason that we've held off on any address imports in MA. It still
> hasn't happened, and I'm not sure if it ever will, but it may be worth
> looking into before doing this on a larger scale.
> - Lars
> On Sat, May 23, 2015 at 6:31 PM, Frederick Hunter
> <fhunterz at verizon.net> wrote:
>         Hi All,
>         I am still relatively new to OSM and have come up with what I
>         think is a
>         more efficient way of adding address data to buildings using
>         JOSM.
>         So far I have added a number of addresses to Maynard, MA and
>         began
>         working on Concord, MA using the JOSM L3 Parcel background
>         layer. This
>         has taken a very long time, and I am hoping to get some buy in
>         for this
>         more efficient way of importing address data to OSM.
>         I created a quick overview of my idea and proof of concept on
>         my blog
>         https://www.openstreetmap.org/user/xunilOS/diary/35076.
>         High level overview of what I would like to do:
>         1. Create .osm xml file with a towns addresses using a script
>         and L3
>         Parcel data
>         2. Temporarily import address nodes into JOSM
>         3. Download a section of the town for editing
>         4. Merge the address nodes with buildings, verifying addresses
>         are in
>         line with L3 Parcel background layer
>         5. Delete all the address nodes based on a unique tag I can
>         search by
>         6. Upload changes to OSM
>         7. Using OSM Inspector check for road name mismatches or other
>         errors.
>         Before using this method, I would like to gather some thoughts
>         or things
>         I may want to do differently from the folks on this thread.
>         A few questions I specifically have.
>         1. Can I do this?
>            - I would imagine this is no different than using the
>         MassGIS L3
>         Parcel data layer in JOSM as the data is coming from the same
>         source and
>         the wiki page on massGIS states it can be used as long as it
>         is
>         sourced.
>         2. Does this qualify as a bulk import and need to go through
>         the a
>         complete import review / community buy in ect.. as stated on
>         https://wiki.openstreetmap.org/wiki/Import/Guidelines.
>            - The way I see it, the data is coming from the same source
>         which
>         has already been approved. Also, the merging of address data
>         is still a
>         manual step as I don't want to upload addresses as single
>         nodes, but add
>         them to buildings. This would allow me to verify the address
>         numbers are
>         in line with the L3 parcel data layer in JOSM.
>         Many thanks in advance for your thoughts,
>         Frederick
>         _______________________________________________
>         Imports-us mailing list
>         Imports-us at openstreetmap.org
>         https://lists.openstreetmap.org/listinfo/imports-us
> -- 
> Lars Ahlzen
> lars at ahlzen.com

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