<html><head></head><body><div style="font-family:verdana, helvetica, sans-serif;font-size:13px;"><div style="font-family:verdana, helvetica, sans-serif;font-size:13px;"><div><div>This time I selected areas for 25 Tasking Manager projects completed in August 2018. OSM buildings extracts for the analysis are for August 30. <br></div><div><br></div><div>Individual contributors Building Maps are provided for contributors to prioritze for validation. These visualisations are usefull to evaluate rapidly. It is also possible to import into JOSM for validation / correction.</div><div><br></div><div>Irregular geometries indicators show again a great variability of results with a minority of contributors mapping less and mapping with less precision. Results vary also greatly from one project to the other (ratios from 1% to 61% of irregular forms).</div><div><br></div><div>This sample contains nearly 400,000 buildings last updated by 2,135 contributors. A minority of contributors (522) mapped 10.3% of Buildings but 71.2% of Flagged buildings for revision. On average, 64% of buildings traced by this group had irregular forms or topological errors. <br></div><div><br></div><div>As the visualisations show with current data (Overpass extracts), no correction have been done yet since the various project managers moved to other priorities. <br></div><div><br></div><div>See the Blog update on opendatalabRDC<br> <a href="https://opendatalabrdc.github.io/Blog/#!Database_Quality_Analysis_Tasking_Manager.md" rel="nofollow" target="_blank" class="">https://opendatalabrdc.github.io/Blog/#!Database_Quality_Analysis_Tasking_Manager.md</a></div><div><br></div><div><br></div><div><br></div><div class="ydp6d9abd0fsignature"><span style="font-style:italic;color:rgb(0, 0, 191);font-weight:bold;"> <br><font face="garamond, new york, times, serif">Pierre </font><br></span></div></div></div></div></body></html>