[Imports-us] Baltimore Building Outlines Import

Elliott Plack elliott.plack at gmail.com
Sat May 4 16:43:12 UTC 2013


Matthew emailed me last night about this, and I'm excited to see him take over. I hadn't thought to pull the addresses from the parcel network.


I can also confirm the data is public domain. I work closely with the city GIS team in my work at Baltimore County.


Matthew: since your doing addresses, perhaps I should remove some buildings I already brought in.


Building type: you might be able to tell if its classified residential or commercial or whatever from the GIS data.


Looks great overall!


Elliott
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Elliott Plack
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On Sat, May 4, 2013 at 12:36 PM, Clifford Snow <clifford at snowandsnow.us>
wrote:

> On Fri, May 3, 2013 at 9:03 PM, Matthew Petroff
> <openstreetmap at mpetroff.net>wrote:
>>
>> Using QGIS, I assigned approximate street addresses to each building using
>> a
>> parcel map [3] and used the field calculator to clean up the labels and
>> remove
>> abbreviations. In addition, I removed all data that intersected with
>> existing
>> buildings to preserve existing work. I then separated the data into smaller
>> chunks and converted the Shapefiles to OSM with Merkaartor. After
>> simplifying
>> Merkaartor's output using osmconvert's "--drop-author" switch, I tagged the
>> data with sed, before finally using JOSM to remove duplicate vertices and
>> empty
>> tags. My only qualm with the data is that some buildings have more nodes
>> than
>> they need, but I'm not sure what can be done about it besides manually
>> reviewing
>> and simplifying all 200k+ outlines.
>>
> This is a great project. Having building outlines really helps when doing
> mapping parties.
> I would recommend doing a sample check of parcels and building outlines to
> verify that the combined data is accurate. And since you are using parcel
> data, is that also Public Domain?
> How many more nodes do typical building contain? We found importing
> building outlines in Seattle, that the imported outlines were much more
> detained, and accurate, than human drawn outlines. More nodes, but much
> richer looking outlines.
> I would recommend reading wiki.openstreetmap.org/wiki/Imports and adding
> your import to the catalog. You can use our import of buildings and
> addresses to Seattle as an example. See
> wiki.openstreetmap.org/wiki/SeattleImport
> Lastly, how do you plan to actually import the data? Are you using a
> script? If so what are you using?
> -- 
> Clifford
> OpenStreetMap: Maps with a human touch
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