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. <div><br></div><div>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</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Dec 13, 2012 at 9:56 AM, Josh Doe <span dir="ltr"><<a href="mailto:josh@joshdoe.com" target="_blank">josh@joshdoe.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="gmail_extra"><div class="gmail_quote"><div class="im">On Thu, Dec 13, 2012 at 12:46 PM, Jeff Meyer <span dir="ltr"><<a href="mailto:jeff@gwhat.org" target="_blank">jeff@gwhat.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="gmail_extra"><div>On Thu, Dec 13, 2012 at 8:55 AM, Josh Doe <span dir="ltr"><<a href="mailto:josh@joshdoe.com" target="_blank">josh@joshdoe.com</a>></span> wrote:<br><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Obviously the number actually imported will be less, since I'm assuming there are a few structures already mapped in OSM. :)</blockquote></div><div class="gmail_extra"><br></div></div>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.<br>
</div></blockquote></div><div><br>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.<br><br>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.<span class="HOEnZb"><font color="#888888"><br>
<br>-Josh<br></font></span></div></div></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><font size="1">Jeff Meyer<br>Global World History Atlas<br><a href="http://www.gwhat.org" target="_blank">www.gwhat.org</a><br><a href="mailto:jeff@gwhat.org" target="_blank">jeff@gwhat.org</a><br>
206-676-2347<br></font><br><br>
</div>