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Sumit Dugar, Practical Action Consulting | Nepal Session | SotM Asia 2017


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State of the Map Asia (SotM-Asia) is the annual regional conference of OpenStreetMap (OSM) organized by OSM communities in Asia. First SotM-Asia was organized in Jakarta, Indonesia in 2015, and the second was organized in Manila, Philippines in 2016. This year’s conference, third in the series, was organized in Kathmandu, Nepal on September 23 – 24, 2017 at Park Village Resort, Budhanilkantha, Kathmandu, Nepal.

We brought nearly 200 Open Mapping enthusiasts from Asia and beyond to this year’s SotM-Asia. The event provided an opportunity to share knowledge and experience among mappers; expand their network; and generate ideas to expand map coverage and effective use of OSM data in Asian continent. We chose ‘from creation to use of OSM data’ as the theme of this year’s conference, emphasizing on the effective use of OSM data. We also brought together a government panel from four different countries in this year’s SotM-Asia. We believe this event will deepen the bond and enhance collaboration among OSM communities across Asia.

More information about the conference can be found on:

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Sumit Dugar, Practical Action Consulting | Nepal Session | SotM Asia 2017

  1. 1. Participatory and Collaborative Digital Mapping to Enhance Community Disaster Resilience
  2. 2. The Demand • The Sendai Framework for Disaster Risk Reduction Theme 1 - Understanding Risk needs … “to develop, periodically update and disseminate, as appropriate, location- based disaster risk information, including risk maps, to decision makers, the general public and communities at risk of exposure to disaster in an appropriate format by using, as applicable, geospatial information technology”.
  3. 3. The Problem • Data deficiency in developing countries
  4. 4. The Problem • Global Model VS Local Need “Global Flood Risk Models have their limits compared with local-scale models, and there is often a mismatch between their actual ability and the envisaged use by practitioners. … without profoundly improved representations of exposure and vulnerability, gains from improved hazard modelling will not filter through to improved risk estimates.” Ward, et al. (2015). Usefulness and limitations of global flood risk models. Nature Climate. Change
  5. 5. Old Data – Participatory Mapping Participatory Rural Appraisal (PRA) and Vulnerability and Capacity Assessment (VCA) • Resource map • Social map • Risk map
  6. 6. Evolution of Participatory Mapping • Ground mapping • Sketch mapping • Transect mapping • Scale mapping • 3D-modeling • GPS mapping • Aerial/Remote sensing imageries • Multimedia mapping • PGIS
  7. 7. An Integrated Approach The general procedure – a) Collect and digitize or rasterize existing analog community maps (PRA, VCA and others) and identify geographic locations of target communities; b) Conduct remote mapping on the OSM platform using both satellite images and community maps and generate preliminary baseline community maps; c) Develop, together with local stakeholders, field surveys to fill major data gaps in the preliminary maps; d) d) Organize focus groups with local communities to discuss and further improve the baseline maps;
  8. 8. The general procedure (continued) e) Maintain traditional community participatory mapping activities using baseline maps as the basis and add information to capture new changes (e.g., land use changes, impacts from recent disaster events) and discuss risk reduction and preparedness options; f) Store spatial information locally in a GIS (likely by government agencies and NGOs) and upload non-sensitive data to OSM; g) Periodically update the maps and share and exchange them across communities and with regional stakeholders.
  9. 9. Pilot – Karnali River Basin, Nepal
  10. 10. 2014 Flood in Karnali River Basin
  11. 11. Pilot in Lower Karnali [2015-2017]
  12. 12. Results – Lower Karnali River Basin 50,000 + buildings and 100+ km of roads mapped in half a year
  13. 13. • Overlaying the available flood inundation maps over Open Street Map layers for Lower Karnali Region • Making comparison between the model outputs from HECRAS and Delft 3D Modelling for 20 Year and 100 Year Flood Scenarios • Also looking how the inundation map for modified river section (way to incorporate sediment dynamics) differs in extent and exposure Scale up in Lower Karnali River basin
  14. 14. •Extent: •Delft 3D modelling captures larger extent of lower depth inundation •Hot spot zones: •Northernmost delta region-Delft 3D Model •Southernmost delta region-HECRAS •Southern border region of Tikapur for both models
  15. 15. • Similar differences across the model results as observed for 20 year flood scenarios • Level of flooding increased in the hotspot zones • Delft 3D Modelling captured more prominent flooding beyond the Nepal border
  16. 16. 0 5000 10000 15000 20000 25000 30000 35000 40000 0-0.5 0.5-1 1-1.5 1.5-2 2-2.5 2.5-3 3-3.5 3.5-4 >4 NumberofBuildingsExposed Flood Inundation Depth (m) Karnali Flood of 20 Year Return Period Exposure Details Vs Inundation Depth Delft 3D Modelling using TanDEM-X Delft 3D Modelling using TanDEM-X (River Section Modified) HECRAS Modelling using SRTM DEM 0 5000 10000 15000 20000 25000 0-0.5 0.5-1 1-1.5 1.5-2 2-2.5 2.5-3 3-3.5 3.5-4 >4 NumberofBuildingsExposed Flood Inundation Depth (m) Karnali Flood of 100 Year Return Period Exposure Details Vs Inundation Depth Delft 3D Modelling using TanDEM-X HECRAS Modelling using SRTM-DEM Preliminary Flood Risk Analysis – Inundation Depth Vs Exposure Building Details
  17. 17. Disaster Resilience Building • Improve human and social capital directly • Building new relationships among local stakeholders • An inclusive partnership • Support better land use planning and management of natural and physical capital
  18. 18. GPDRR Award Youth-led Projects on Flood