hurricane katrina damage analysis alex stern and william tran
TRANSCRIPT
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Hurricane Katrina Damage Analysis
Alex Stern and William Tran
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Overview
Assess the flood extent and impact created by Hurricane Katrina in New Orleans
Examining Orleans Parish
Duke University
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Initial Steps
Collect Data Landsat 5 images from August 25th,
2005 and September 7th, 2005 Extract to Orleans Parish using Arc
Map, Parish shapefile
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Classification
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Accuracy Assessment 2005 NAIP 2m orthophoto mosaicClass Reference Classified Number Producers Users Name Totals Totals Correct Accuracy Accuracy
Class 0 38 54 38 --- --- Urban 16 25 10 62.50% 40.00% Vegetation 38 20 20 52.63% 100.00% Wetlands 15 24 11 73.33% 45.83% Flooded 1 0 0 --- --- Water 42 27 27 64.29% 100.00%
Overall Classification Accuracy = 70.67%
Overall Kappa Statistics = 0.6291
Class Name Kappa Class 0 0.6032 Urban 0.3284 Vegetation 1.0000 Wetlands 0.3981 Flooded 0.0000 Water 1.0000
*No accuracy assessment performed on post-storm image
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Rough Estimate
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Tabulated Data
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Flooded Urban
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Urban to Vegetation
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Water to Wetlands
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Tabulated Data
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Change Detection 37 sq miles of flooded urban 54 sq miles of flooded land Increase of water and vegetation Urban class lost 56 sq. miles
Evaluated over total land area:○ 134,585 persons displaced, 16,697 housing units
damagedEvaluated over urban land area:○ 281,332 persons displaced, 34,916 housing units
damaged
Loss of wetlands, errors4 sq miles of wetlands changed to urban
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Problems and Limitations Inaccuracy of classifications Inaccuracy of census data
interpretation and analysis Limitation of area analyzed Technical Errors
○ ArcMap conversions○ Differences in shapefiles○ Multiple extractions
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Real World Application
FEMA Military Insurance rates
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Questions?
NASA/Jeff Schmaltz, MODIS