Download - January 12, 2010 Haitian Earthquake Damage Assessment Using High Resolution Satellite Imagery
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.