Dear OSM-PH and Hotties, Just a word of thanks to those who helped in mapping Quiapo area [0]. Your contribution helped a lot in the buildup of our dataset for our DRR project.
After our mapping event, we believe we covered 50% of all buildings in the area [1]. A subsequent field mapping was done by our staff and local partner which increased the coverage to ~70%. We will continue validating the data and in the coming days, test the suitability of the information into InaSafe's impact modelling [2]. There are a few more tasks that need to be completed in the extended areas around Quiapo, and, we encourage you fill in the gaps. One thing we observed during the validation is that while the initial tracing is very helpful, sometimes, "poor" tracing can influence the quality of validation in the field using field/walkingpapers particularly for highly urbanized areas like our site. Some research calls this path dependency effect, where, “the first iterations have a high impact on the final results due to a path dependency effect.” A good discussion I found was from Patrick Meier's blog [3]. [0] http://tasks.hotosm.org/job/56 [1] http://www.openstreetmap.org/?relation=2524687 [2] http://inasafe.org/ [3] http://irevolution.net/2012/09/24/best-way-to-crowdsource-satellite-imagery-analysis/ _______________________________________________ talk-ph mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-ph
