In Japan, municipalities are mandated toproduce hazard maps for floods, storm surges, volcaniceruptions, tsunamis, stagnant water, and landslides to whichthe municipality may be exposed. By combining exposure datawith satellite images and aerial photographs, post-eventdamage assessments can be carried out with reasonableaccuracy. Japan's experience with the disaster of March2011 demonstrates that having exhaustive data on exposureexpedites the damage assessment process, thereby reducingthe time required for compensation payments and insurancepayouts. Immediately after the Great East Japan Earthquake(GEJE) and tsunami, information on the damage caused by thedisaster was collected rapidly and shared among respondingagencies using a variety of top-down and bottom-up tools,including remotely sensed data, public and private datasets,and online tools such as the Ushahidi-based sinsai.info website. The data-collection and dissemination effortunderpinned assistance to the affected population, timelyallocation of resources to areas in need, and effectivereconstruction planning. This report gives findings;lessons; and recommendations for developing countries.
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