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Measuring the impact of humanitarian mapping in Nepal
Posted on Tuesday, 9 June 2015

Last April 25, Nepal was rocked by a magnitude-7.8 earthquake, the largest one the country has seen in 81 years.

In an effort to mobilize relief efforts faster, volunteers from Tableau joined the Humanitarian OpenStreetMap Team (HOT) to help map Nepal and provide information in the midst of crisis. 4,000 volunteer cartographers focused on items most critical to first-response efforts like roads and buildings. Within 48 hours of the quake, volunteers had added more than 13,199 miles of new roads and 110,681 new buildings in remote, previously-unmapped regions of Nepal.

Last May 13 — 18 days after the main quake and two days after a 7.3-magnitude aftershock — the Tableau team queried OpenStreetMap’s road segments to analyze the volunteers’ work. Tableau’s analysis showed that a few volunteers were particularly active, editing between 1,000 and 16,000 road segments apiece. However, the majority of edits were done by a group of volunteers with a median edit of five road segments. Altogether, these editors contributed up to 65 percent of the changes in the roads data, whereas the top 20 editors only contributed 35 percent.

Nepal_dashboard



To learn about what “long tail” is and its impact in this situation, read the complete article here.

This visualization was done with Tableau business intelligence. Get a free 14-day full version trial of Tableau by clicking here.

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