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Use of GIS Analysis in Historic Preservation Disaster Response

Use of GIS Analysis in Historic Preservation Disaster Response. Introduction. New Orleans scenario Widespread flooding Large areas not immediately accessible Condition of individual facilities unknown, therefore number and type of experts needed unknown as well. Goal.

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Use of GIS Analysis in Historic Preservation Disaster Response

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  1. Use of GIS Analysis in Historic Preservation Disaster Response

  2. Introduction • New Orleans scenario • Widespread flooding • Large areas not immediately accessible • Condition of individual facilities unknown, therefore number and type of experts needed unknown as well

  3. Goal Use GIS to assist in recovery efforts when historic assets, such as museums and historic sites, are impacted by a widespread flood disaster.

  4. Goal • Determine the likelihood that a facility has been flooded • Prioritize recovery efforts by facility • Estimate time when access to facilities would be feasible • Provide a route to each facility avoiding streets blocked by flood waters or debris

  5. Objectives • Obtain digital data for water level and elevation • Obtain or create point files showing the location of museums & historic sites • Determine level of water at each location • Categorize flood risk at each location to facilitate effective use of resources

  6. Data • USGS SDTS DEM files for Orleans Parish • 1:24,000 • 12 quadrangles to cover parish • Used mosaic tool to create one elevation raster • Publicly available at www.geocomm.com

  7. Data • TIGER street file • Publicly available from US Census Bureau • Based on USGS 1:100,000 topo maps • Historic Sites shape file • Publicly available from the Louisiana Register of Historic Places

  8. Data • Water level raster • Source: FEMA • Not yet available to the general public • Created from LIDAR data

  9. Data • Parish boundary • US Geological Survey shape file • Contained all counties in the US • Created Orleans Parish shape file by selection • Publicly available at www.nationalatlas.gov

  10. Data • Museums file • Obtained list from www.neworleansmuseums.com • Entered addresses into a table • Created shape file using an address locator

  11. Analysis • Clipped all vector files using parish boundary file • Created Museum feature class using • Projected all files to Louisiana State Plane • Created a geodatabase and imported all files

  12. Analysis • Used Zonal Statistics to determine elevation at locations of historic sites and museums • Used Zonal Statistics to determine water depth at locations of historic sites and museums • Joined elevation and water level tables to historic site and museum files

  13. Analysis • Queries to select historic sites and museums where water level was above ground level • Output consists of 3 categories: • Green (water level =< ground level) • Yellow (water level up to 2 feet above ground level) • Red (water level > 2 feet above ground level

  14. Analysis • 24 Museums • 14 with no flooding • 7 with flooding up to 2 feet • 3 with flooding over 2 feet

  15. Analysis • 101 Historic Sites • 12 with no flooding • 86 with flooding up to 2 feet • 4 with flooding over 2 feet

  16. Conclusion • Improvements • Shape file of buildings • Transportation network • Incorporate GPS • Continually re-adjust based on water level

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