Mapping the extent of a natural hazard (e.g., assessing areas with a high risk) or disaster is a first step in disaster risk management and emergency response. Subsequently, exposure mapping enables the estimation of the impact of hazards or disasters, for example, regarding the number of affected inhabitants or infrastructure. The following practice shows the use of Quantum GIS to analyze a disaster extent map in combination with auxiliary data such as population or land cover data.
The objective of this practice is to estimate the exposure of a natural hazard or disaster. As an example, the number of inhabitants affected by a flood event is estimated. The joint use of the flood mask, created by the Recommended Practice: Flood Mapping, and the WorldPop data set constitutes a viable solution to quickly estimate the impact of the flood regarding the population. The proposed methodology is a universal practice which combines a simple approach based on open-source software and free of charge data together with a beforehand created map covering the extend of a natural hazard or disaster.
Disaster Cycle Phase:
Recovery & Reconstruction
Relief & Response
The practice was applied in the context of the flood event in Malawi in January 2015. Since December 2014, heavy rains affected Malawi causing rivers to overflow. The flooded area in this analysis covered a part of the Nsanje district around Chiromo.
This practice can be applied globally. Besides of the beforehand created hazard or disaster extent map, the practice does not need specific near real-time data as it is based on population, land cover, or other auxiliary geodata archives. The WorldPop data set provides population data for Africa, Asia as well as Central and South America with a spatialresolution of 100 meters. The Landcover30 data base provides global landcover data with a spatial resolution of about 30 meters.
At the request of the National Emergency Management Agency (NEMA), Government of Mongolia, UN-SPIDER supported NEMA and stakeholders organisations in strengthening disaster risk management and emergency response by effective use of space based information including data sharing, National Spatial Data Infrastructure, policy level interventions and capacity.
The team of seven experts, under leadership of the UN-SPIDER, visited Mongolia from 11-15 August 2014. The mission team represented following organisations: UN-SPIDER/UNOOSA, National Disaster Reduction Center of China (NDRCC), University of Georgia, Airbus Defence and Space, Asia Disaster Preparedness Center (ADPC), United Nations Office for the Coordination of Humanitarian Affairs (UNOCHA) and Asia-Pacific Space Cooperation Organization (APSCO). Some of these organisations are already engaged with organisations in Mongolia in the area of disaster management and space technology.
During this five-day mission, the mission team visited seven Ministries and Government agencies and three United Nations offices to carry out in-depth discussions. On 15 August, the Workshop “Use of Space Technology in Disaster Risk Management” was organized. About 40 officials representing various ministries/departments, institutions, and academia attended the workshop. The workshop generated awareness among a larger group of stakeholders in Mongolia, and sought their inputs on current challenges in using in disaster management.
Mongolia has invested heavily in Earthquake Early Warning Systems and needs to strengthen its’ efforts towards disaster risk reduction as well as to be equipped with adequate capacity, skills and infrastructures;
DRR decision making calls for balanced effort to address issues with respect to stages of disaster management and related activities should be further linked to climate change issues involving space based information ;
Long term analysis should be conducted on a regular basis;
More detailed hazard assessments maps are needed for operational purposes;
Mechanisms should be established for allowing for rapid data sharing with minimal administrative action;