Digital Sensor Capabilities

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Digital Sensor Capabilities
Leica Geosystems ADS40 Z/I Imaging DMC Leica
Geosystems ALS50

• Prepared for
• NOAA Coastal Service Center
• By
• John Craig, Ph.D.
• Jeremy Conner

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Sensors Discussed

• Leica Geosystems ADS40
• Z/I Imaging DMC
• Leica Geosystems ALS50

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• Leica Geosystems
• ADS40

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ADS40 Highlights

• Reduction of Materials Labor to Produce Digital
  Imagery
• Faster Turnaround Time from Flight to Image Data
• Clean Digital Data Delivers High Quality Imagery
• Meets / Exceeds ASPRS National Map Accuracy
  Standards

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Differences From Film Cameras

• Digital Sensor, No Film, and Few Moving Parts
• Produces a 12,000 Pixel Wide Image Through
  Scanning Approach
• Captures Color, CIR, and Panchromatic in One
  Flight

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Principle of a Frame Based Sensor and a Scanning
Sensor
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Frame Based Stereo Imagery
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Multispectral Capture In Three Views
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Data Format

• Captured in 12-Bit
• Scaled to 16-Bit for Processing
• May Be Delivered as 16-Bit, 8-Bit, or Both

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ADS40 Processing Environment

• Hardware Used
• Condor High Performance Computing Environment
• 5 Dual 2Ghz Opteron Nodes, 4GB Ram Each Node
• 3 Dual 2Ghz Xeon Nodes, 2GB Ram Each Node
• 15 TB Storage (Expandable as Needed)

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ADS40 Capabilities

• 1-Meter Pixel Orthophotography
• 6-Inch Pixel Orthophotography
• Very Fast Turnaround
• Days to Deliver Data Rather than Months

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Remote Sensing and ADS40

• 12-Bit Data Capture is Advantageous (4096 Levels)
• All Bands are Captured in Native Pixel Resolution
• Spectral Range
• Panchromatic 465 680
• Red 610 660
• Green 535 585
• Blue 430 490
• Near IR 835 885

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CIR Image Normalized Difference Vegetation Index
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RGB Image and Land/Water Map
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ADS40 Capacity

• Example Project 1-foot pixel, 1,000 square
  miles, RGB CIR, Southeastern Location, Good
  Weather
• Data Acquisition 1 2 Days
• Download and Deliver to Office 1 Day
• Processing (orthos, tiling, color balance, qc,
  etc.) 14 Days
• Reduced Delivery Time Increases Capacity Greatly
• SJRWMD 12,500 Sq. Mi. DOQQ (RGB, CIR) 7 months
  to Deliver
• Horrible weather, new software, first large job

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• Z/I Imaging DMC

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Z/I DMC Highlights

• Reduction of Materials Labor to Produce Digital
  Imagery
• Faster Turnaround Time from Flight to Image Data
• Clean Digital Data Delivers High Quality Imagery
• Meets / Exceeds ASPRS National Map Accuracy
  Standards

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Basics of the DMC

• 4 Panchromatic Cameras at Slightly Oblique Angles
• Creates a Single Central Perspective Image by
  Resampling and Mosaicking

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Advantages of 12-Bit Data

• Provides 4096 Levels, Film Provides 256 Levels
• Greater Control of Color, Contrast, Brightness
• Gives Greater Depth
• Allows us to See Through Shadows
• Better Mapping Results

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12-Bit Data Adjustment to Reduce Shadows During
Mapping
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DMC Color and CIR

• Provides RGB, CIR, and Panchromatic
• Panchromatic Captured at Native Scale, R,G,B and
  CIR are Captured at Quarter-scale
• Pan Sharpening is Used to Colorize the
  Panchromatic Pixels

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DMC Capabilties

• 1-Meter Pixel Orthophotography
• Extreme Ortho Detail
• 1.5 Inch Orthos
• Very Fast Turnaround
• Days to Deliver Data Rather than Months

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DMC Sample Imagery (3 Pixel)
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Z/I DMC Nashville, TN
ALABAMA STATEWIDE GIS
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File Formats Supported

• No Proprietary Format Used as Final Deliverable
• Delivered in Any GIS Ready Format

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• Leica Geosystems
• ALS50

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Principle of LIDAR
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Galvonometer Controller
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LIDAR Workflow

• Flight is Performed

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LIDAR Workflow

• Ground Control Captured Coincident with Flight
• RTK of Centerlines
• Capture of All Point Classes as Defined by FEMA
  Spec.

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LIDAR Workflow

• Process GPS Data from Airborne GPS and Tie to
  Existing Network

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LIDAR Workflow

• Boresighting Performed
• Collect Flightlines using a proprietary design
  over a known location (ground surveyed)
• Use Leica Attune and ELVIS to boresight the
  information.
• This assures better than 15cm Vertical Accuracy.

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LIDAR Workflow

• Data Editing
• ELVIS Software
• Terrascan
• Proprietary Filters

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LIDAR Workflow

• Data Editing
• Identification of Project Specific
  Characteristics, and Processes are Applied to
  meet those Characteristics (exact characteristics
  and processes are proprietary)
• Parameters for the Project are Established
• Parameters Determine Overall Project Approach
  (again, proprietary technology and approach)

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LIDAR Workflow

• Data Imported into TerraScan for Overview
• Surface is Generated to Identify Missing
  Elevation Features (Roads clipped out, aggressive
  or soft editing processing, buildings holes not
  filled, etc.)
• Data Shipped to LIDAR QC for Rigorous QC

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LIDAR Workflow

• Deliverables Created
• Raw Points
• Bare Earth Points
• DEMs
• Contours
• Intensity Images
• RAW TIN