[Imports] [Talk-us] MassGIS Building Import Start

[Jeff Meyer]

Agreed about having to deconflict after buildings are imported on top of
other buildings. I didn't see any suggestion of that in Jason's process.

In Seattle, we're looking at doing a manual comparison of each building way
provided by the city to the building ways already in OSM. Essentially,
manually copy the new buildings into the OSM data layer in JOSM, identify
duplicates, compare, make sure all tags are kept in the desired way, then
delete the undesired way, move to the next one. In my neighborhood, I've
found that the city's shapes are better than my Bing traces 100% of the
time. - Jeff


On Thu, Dec 13, 2012 at 9:56 AM, Josh Doe <josh at joshdoe.com> wrote:

> On Thu, Dec 13, 2012 at 12:46 PM, Jeff Meyer <jeff at gwhat.org> wrote:
>
>> On Thu, Dec 13, 2012 at 8:55 AM, Josh Doe <josh at joshdoe.com> wrote:
>>
>>> Obviously the number actually imported will be less, since I'm assuming
>>> there are a few structures already mapped in OSM. :)
>>
>>
>> Should there be an implicit assumption that structures already mapped in
>> OSM are of better quality than those being reviewed for import? Obviously,
>> there shouldn't be a blind overwrite or duplication, but the process Jason
>> has outlined involves a fair amount of curated review.
>>
>
> For the first take, yes, don't import any structures that are already
> mapped (or really, just overlap), which is what he seems to have done with
> the preprocessing step.
>
> It would be useful to create a second OSM file with structures that were
> excluded in this preprocessing step, so a second step could be to compare
> them in case MassGIS is more accurate or up to date than what is in OSM.
> Perhaps Jason has already done this, or at least saved the original
> database so this can then be run. It would be very messy to determine which
> buildings were excluded after the import is done, without looking at the
> full history of each building.
>
> -Josh
>



-- 
Jeff Meyer
Global World History Atlas
www.gwhat.org
jeff at gwhat.org
206-676-2347
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