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Hurricane Katrina Damage Analysis
Alex Stern and William Tran
Overview
Assess the flood extent and impact created by Hurricane Katrina in New Orleans
Examining Orleans Parish
Duke University
Initial Steps
Collect Data Landsat 5 images from August 25th,
2005 and September 7th, 2005 Extract to Orleans Parish using Arc
Map, Parish shapefile
Classification
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
Rough Estimate
Tabulated Data
Flooded Urban
Urban to Vegetation
Water to Wetlands
Tabulated Data
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
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
Real World Application
FEMA Military Insurance rates
Questions?
NASA/Jeff Schmaltz, MODIS