1. Hurricane Katrina Damage Analysis Alex Stern and William Tran

2. Overview  Assess the flood extent and impact created by Hurricane Katrina in New Orleans  Examining Orleans Parish Duke University

3. 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

4. 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

5. Accuracy Assessment 2005 NAIP 2m orthophoto mosaic Class ReferenceClassifiedNumberProducersUsers Name Totals TotalsCorrect AccuracyAccuracy 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

6. Rough Estimate

7. Tabulated Data

8. Flooded Urban

9. Urban to Vegetation

10. Water to Wetlands

11. Tabulated Data

12. 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

14. 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

15. Real World Application  FEMA  Military  Insurance rates

16. Questions? NASA/Jeff Schmaltz, MODIS