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Mobile Bay Water Quality Assessment Using NASA Spaceborne Data Products
Jenny Q. Du
Mississippi State University
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OutlineOutline
• Project Objectives
• Current Research Status
• Proposed Approaches– Images with higher resolution– Classification methods
• Preliminary Results
• Ongoing Efforts
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Project ObjectivesProject Objectives
• To use NASA Spaceborne Imagery (i.e., Landsat, ASTER, Hyperion) in the study of water quality and sediment dynamics in Mobile Bay, AL.
• To compare with the NASA research products in Mobile Bay using MODIS imagery and assess the improvements.
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This MODIS satellite image shows sediment plumes moving into the Gulf of Mexico from the main branch of the Mississippi River and through the bayous in its Delta region
(visibleearth.nasa.gov)
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Landsat 11/27/1999
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Landsat 11/27/1999 (Mobile bay)
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Landsat 10/15/2001
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Landsat 10/15/2001 (Mobile Bay)
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Landsat 2/17/2001
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Landsat 2/17/2001 (Mobile Bay)
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Current Research StatusCurrent Research Status
• MODIS (Aqua/Terra) – Pros: wide spatial coverage, high temporal
resolution (covers the entire globe almost everyday)
– Con: low spatial resolution (250m-1000m)
• Hard classification– K-means clustering– ISODATA
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Proposed ApproachesProposed Approaches
• Satellite Images with Higher Resolutions– LANDSAT
• 30 m spatial resolution (can be enhanced to 15m); 4 VNIR bands– ASTER
• 15m spatial resolution; 3 VNIR bands– Hyperion
• 30m spatial resolution; 220 bands
• Fine Classification– Statistical Classifiers
• Correlation Study with Ground Truth– In situ sampling (Nov. 2007 – Sep. 2008)– Historic data
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Preliminary ResultsPreliminary Results
• Satellite Images with Higher Resolutions– LANDSAT
• Classification– ISODATA
• Correlation Study with Ground Truth– Historic data (e.g., Water Resources Database)
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Landsat 9/26/1991 (Mobile Bay)
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
(Hard) Classification Result
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations1=5.1Stations2=4.7
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations3=20Stations4=25
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations5=9.8Stations6= 10.3
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations7=27
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Satellite Image 09/26/1991Ground Truth(Turbidity) 09/27/1991Stations 1 2 3 4 5 6 7
Class 2 2 3 3 4 4 5
Turbidity 5.1 4.7 20 25 9.8 10.3 27
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Landsat 11/27/1999 (Mobile Bay)
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
(Hard) Classification Result
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations1=5.1Stations2=5.5Stations3=3.3Stations4=4.4Stations5=4.0TSSStations1=24Stations2=22Stations3=17Stations4=19Stations5=16CHL-AStations1=5.5Stations2=7.0Stations3=6.8Stations4=4.4Stations5=7.9
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations6=7.9TSSStations6=43CHL-AStations6=37
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Satellite Image 11/27/1999Ground Truth 11/27/1999
Stations 1 2 3 4 5 6
Class 4 4 4 4 4 2
Turbidity 3.3 4.4 5.5 5.1 4 7.9
TSS 17 19 22 24 16 43
Chl-A 6.8 4.4 7.0 5.5 7.9 37
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Landsat 2/17/2001 (Mobile Bay)
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
(Hard) Classification Result
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Land
Class 1
Class 2
Class 3
Class 4
Class 5
Observation Stations
TurbidityStations1=18
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Satellite Image 02/17/2001Ground Truth(Turbidity) 02/08/2001Stations 1
Class 3
Turbidity 18
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Proposed Approaches (Cont’d)Proposed Approaches (Cont’d)
• Classification Approaches
r = M a– Unsupervised Linear Mixture Analysis
• Endmember signature extraction
• Fully constrained linear unmixing
– Blind Source Separation• Independent Component Analysis
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Original Image
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Linear unmixing result (soft Classification)
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The (soft) endmember classification map that can be used for detailed water quality mapping
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ICA result (soft classification)
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The independent component (soft classification map) that can be used for detailed water quality mapping
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Ongoing EffortsOngoing Efforts
• More detailed correlation analysis– Images and ground truth data collected at the same
time.– Images collected during Nov. 2007 and Sep. 2008.