Hurricane Mitch - PowerPoint PPT Presentation

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Hurricane Mitch

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Lidar instruments can be mounted on satellites, the space shuttle, or small aircraft (as shown here), or they can be used on the ground (yellow instrument shown here). – PowerPoint PPT presentation

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Title: Hurricane Mitch


1
Using Natural Disasters to Teach Science
Hurricane Mitch October 1998
2
Using Natural Disasters to Teach Science
Destruction Caused by Hurricane Mitch in Honduras
  • Hurricane stalled over the mainland October 29
    - 31 1998.
  • 7,000 fatalities
  • 33,000 homes destroyed
  • 95 bridges destroyed
  • 70 of road network damaged

3
Flooding Caused by Hurricane Mitch
Destroyed housing
Flood-inundated area
Destroyed agriculture
Tributary
Rio Choluteca
4
Using Natural Disasters to Teach Science
Landslides Caused by Hurricane Mitch
5
Using Natural Disasters to Teach Science
El Berrinche Landslide Scar (looking south)
6
Using Natural Disasters to Teach Science
Cross Section and Lidar Map of El Berrinche
Landslide in Honduras (map view to west)
7
Using Natural Disasters to Teach Science
  • Lidar Light Detection and Ranging

8
Using Natural Disasters to Teach Science
Review of Lidar Principles
  • Scanning mirror sweeps laser beam across the
    ground
  • Range to target is determined by measuring time
    interval between outgoing and return of reflected
    laser pulse
  • Aircraft position is determined using GPS phase
    differencing techniques
  • Pointing direction of laser determined with
    Inertial Measuring Unit (IMU) and recording of
    mirror position
  • Data streams recorded and synchronized to process

9
Using Natural Disasters to Teach Science
Lidar Flight Lines over Tegucigalpa, Honduras
Survey area
Flight lines
10
Using Natural Disasters to Teach Science
Result of Lidar Mapping
  • Two-dimensional map of Tegucigalpa, Honduras
  • El Berrinche landslide scar shown by black
    dotted line
  • Colors show elevation of land surface in meters
  • Map is about 3000 m (3 km) wide by 3200 m (3.2
    km) tall.
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