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 25 th, 2005 and September 7 th, 2005  Extract to Orleans Parish using Arc Map, Parish shapefile

Classification  Supervised classification for both images  Landsat 5 bands 1,2,3,4, and 7  Five land cover classes Urban, Vegetation, Wetland, Water, and Flooded Urban

Accuracy Assessment 2005 NAIP 2m orthophoto mosaic Class ReferenceClassifiedNumberProducersUsers Name Totals TotalsCorrect AccuracyAccuracy Class Urban % 40.00% Vegetation %100.00% Wetlands % 45.83% Flooded Water %100.00% Overall Classification Accuracy = 70.67% Overall Kappa Statistics = Class Name Kappa Class Urban Vegetation Wetlands Flooded Water *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 damaged Evaluated over urban land area: ○ 281,332 persons displaced, 34,916 housing units damaged  Loss of wetlands, errors 4 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