January 12, 2010 Haitian January 12, 2010 Haitian Earthquake Damage Earthquake Damage

Assessment Using High Assessment Using High Resolution Satellite Resolution Satellite

ImageryImagery

Mahtab A. Lodhi, Ph.D. Mahtab A. Lodhi, Ph.D. Department of GeographyDepartment of Geography

University of New Orleans, Louisiana University of New Orleans, Louisiana

–…are extreme events within the earth’s system…

–…the economic losses due to natural disasters have shown a significant increase in recent years…

Natural disasters…Natural disasters…

……hazard – a potentially hazard – a potentially damaging damaging phenomenon…phenomenon…

……hazard and hazard and disasterdisaster

Preparedness

Disaster Event

Relief Efforts

Rehabilitation

Reconstruction

Mitigation

….Remote sensing for disaster management…

Study AreaStudy Area

ALI (July 30, 2010) ALI (July 30, 2010) Bands 4,5,6 Bands 4,5,6

merged with Pan merged with Pan bandband

Study AreaStudy Area

Imagery Data UsedImagery Data Used• DigitalGlobe ConstellationDigitalGlobe Constellation– Quickbird & Worldview–2Quickbird & Worldview–2• Pre & Post Event Pre & Post Event – used in visual Analysis used in visual Analysis

• NASA’S Earth Observing–1 (EO–1) NASA’S Earth Observing–1 (EO–1) –Advanced Land Imager (ALI)Advanced Land Imager (ALI)• Pre & Post EventPre & Post Event– used in digital analysisused in digital analysis

–HyperionHyperion• Pre & Post EventPre & Post Event

Spatial resolution VS. spectral Spatial resolution VS. spectral resolutionresolution

WorldView-WorldView-22

HyperionHyperion

BandsBands PAN PAN VisibleVisible NIR –MIRNIR –MIR

1 1 1 1 2 2 3 3 445566778899

0.480 – 0.6900.480 – 0.6900.433 – 0.4530.433 – 0.4530.450 – 0.5150.450 – 0.5150.525 – 0.6050.525 – 0.6050.633 – 0.6900.633 – 0.690

0.775 – 0.8050.775 – 0.8050.845 – 0.8900.845 – 0.8901.200 – 1.3001.200 – 1.3001.550 – 1.7501.550 – 1.7502.080 – 2.3502.080 – 2.350

30 meter30 meter

30 meter30 meter

10 meter10 meter

EO-1 Advanced Land Imager (ALI)

METHODOLOGYMETHODOLOGY

Pre & post-WorldView2

Visual Analysis

Raw (DN)Rectification

Post EO-1A

Post EO-1A

Damaged Buildings

AOI Extraction

HPF Merging

NDVI

Recoded Image

Recoded Image

Merged Image

Mosaic

ISODATA

AOI Extraction

ISODATA

Damage Map

Worldview-2 MosaicWorldview-2 Mosaic

GEOMETRIC CORRECTION OF ALI

Visual Analysis…Visual Analysis…

Worldview2 Worldview2 (18 January 2010)(18 January 2010)

Before Before After After

After After BeforBefore e

Before Before After After

Before Before After After

Before Before After After

Before Before

After After

Before

After

… … on-screen delineation of on-screen delineation of damaged buildings using damaged buildings using post event Worldview2 post event Worldview2

imagery…imagery…

Damaged buildings AOI Damaged buildings AOI extracted from post event extracted from post event

Worldview2 imagery.Worldview2 imagery.

Digital Analysis:Digital Analysis:

- EO-1 ALI (30 July 2010)- EO-1 ALI (30 July 2010)

Red+InfraredRed-Infrared

NDVI

Normalized Difference Normalized Difference Vegetation Index (NDVI)…Vegetation Index (NDVI)…

ISODATA Clustering of ISODATA Clustering of EO1 Data…EO1 Data…

……starts with all pixels as members starts with all pixels as members of spectral class number 1, then of spectral class number 1, then creates fewer variable spectral creates fewer variable spectral classes from the initial variable classes from the initial variable spectral classes…spectral classes…

……some challenges of some challenges of working RS data in urban working RS data in urban environment…environment…

Thank you. Thank you.

WorldView-2 & Quickbird Data WorldView-2 & Quickbird Data Courtesy of DigitalGlobe Inc. EO-1 ALI Courtesy of DigitalGlobe Inc. EO-1 ALI and Hyperion Data Provided by USGS. and Hyperion Data Provided by USGS.