Airborne and Satellite Imaging for Shallow-Water Habitats
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Transcript of Airborne and Satellite Imaging for Shallow-Water Habitats
Airborne and Satellite Imaging for Shallow-Water Habitats
Survey Methods for Shallow-Water Habitat Mapping in New England Dept. of Interior Holdings and
Estuarine Research Reserves Workshop30 Sep. 2009
Mark Finkbeiner
What is It?Optical energy- UV through NIR
Analog – Aerial
photography
Digital – Aerial multi-
spectral imagery
– Digital camera imagery
Aerial Sensors
• DMC (Z/I Imaging)• UltraCam XP (Vexcel- Microsoft)• ADS-80 (Leica)
• GeoScanner (GeoVantage)• DMSC (Ocean Imaging)• DSS (Applanix)• Others
Satellite Sensors
• GeoEye-1 (GeoEye)• Orbview-2• IKONOS (Space Imaging/GeoEye)• Quickbird (Digital Globe)• WorldView- 2 (Digital Globe)
• SPOT
Advantages• Comprehensive data• Familiar data structure• Amenable to both simple and advanced analysis methods• Captures land-water interface• Broad area coverage possible• Effective in shallow waters• Effective in complex landscapes• Being collected routinely for various other applications
Disadvantages
• Ineffective in deeper water• Limited by water clarity• Environmental considerations
– Atmospheric conditions–Sea state– Turbidity– Sun angle – Tide
Disadvantages
• Ineffective in deeper water• Limited by water clarity• Environmental considerations
– Atmospheric conditions–Sea state– Turbidity– Sun angle – Tide
Disadvantages
• Ineffective in deeper water• Limited by water clarity• Environmental considerations
– Atmospheric conditions–Sea state– Turbidity– Sun angle – Tide
Disadvantages
• Ineffective in deeper water• Limited by water clarity• Environmental considerations
– Atmospheric conditions–Sea state– Turbidity– Sun angle – Tide
• Ineffective in deeper water• Limited by water clarity• Environmental considerations
– Atmospheric conditions– Sea state– Turbidity– Sun angle – Tide
Disadvantages
Habitats Amenable to this Technology
• Coastal emergent marsh• Seagrass meadows• Intertidal and shallow-subtidal shellfish beds• Macro algae • Shoreline condition (rocky
shores, beaches, artificial)
Habitats Amenable to this Technology
• Coastal emergent marsh• Seagrass meadows• Intertidal and shallow-subtidal shellfish beds• Macro algae • Shoreline condition (rocky
shores, beaches, artificial)
Habitats Amenable to this Technology
• Coastal emergent marsh• Seagrass meadows• Intertidal and shallow-subtidal shellfish beds• Macro algae • Shoreline condition (rocky
shores, beaches, artificial)
Habitats Amenable to this Technology
• Coastal emergent marsh• Seagrass meadows• Intertidal and shallow-subtidal shellfish beds• Macro algae • Shoreline condition (rocky
shores, beaches, artificial)
Habitats Amenable to this Technology
• Coastal emergent marsh• Seagrass meadows• Intertidal and shallow-subtidal shellfish beds• Macro algae • Shoreline condition (rocky
shores, beaches, artificial)
Habitats Amenable to this Technology
• Coastal emergent marsh• Seagrass meadows• Intertidal and shallow-subtidal shellfish beds• Macro algae • Shoreline condition (rocky
shores, beaches, artificial)
• Level of tidal control• Ferry/Staging time• Sensor selection• Flight line complexity• Spatial resolution• Spatial accuracy• Coverage area
Drivers of Acquisition Cost
Aerial• Licensing• Reseller• Rectification order• Vintage• Specific tasking (off-nadir, cloud
restrictions, etc.)• Coverage area
Satellite
• South Carolina Coast $284/sq. mi.
• North Carolina Coast $682/sq. mi.
• Texas Coast $
Costs and ExamplesAerial Image Acquisition Avg. $200 - $500/sq. mi.
Satellite Image Acquisition Avg. $300 - $500/sq. mi.*• Quickbird $72/sq. mi. min. $7,616
• IKONOS $57/sq. mi. min $5,700
• Classification detail• Mapping method• Required accuracy• Coverage area• Minimum Mapping Unit
Drivers of Mapping Cost
Mapping Methods
• Manual digitization High High Low• Spectral clustering Med. Med. Med.• Feature analysis Low Med. High• Image segmentation Low High High
Method Time Effort Logistics
• Manual digitization Low Low• Spectral clustering Med. Med.• Feature analysis High High• Image segmentation High High
Method Precision Repeatability
Costs and Case Studies
Mapping $200 - $500/sq. mi.
• South Carolina Coast $143/sq. mi.
• Long Island South Shore $674/sq. mi.*
• Texas Coast $207/sq. mi.
• Film is going away
• Digital sensors provide additional bands, improved spatial accuracy, greater dynamic range, and a more streamlined process
• Number and availability of airborne digital sensors is increasing
• Satellite resolution is increasing dramatically
• Satellite revisit cycles are decreasing
Emerging Issues and Trends