Innovative applications of Specim's AISA hyperspectral sensors and software Ing. Marco Bacciocchi, Codevintec
Feb 25, 2016
Innovative applications of Specim's AISA hyperspectral sensors and softwareIng. Marco Bacciocchi, Codevintec
Hyperspectral sensors and software
Current Airborne AISA Products
AISA Systems
EAGLE/EAGLET HAWK DUAL OWL
Spectral range 400-1000 nm 970-2500 nm 400-2500 nm 7.7-12.4 um
Spectral sampl. 3/2.5 nm 6 nm 2.5/6 nm 50 nm
Spectral bands 200/244 256 498 100
Spatial pixels 1024/1600 320 320 384
Image rate 125/160 Hz 100 Hz 100 Hz 100 Hz
SNR 130-1400 800 250-500
Sensor weight 3.5/6.5 kg 18 kg 55 kg 13.5 kg
Total weight 15/28 kg 45 kg 110 kg 35 kg
AISA Airborne HyperspectralSystem Components
Hyperspectral camera
FODIS
Daylight readable LCD Display
GPS/INS unit Compact Data acquisition and storage system
CaliGeo Software
AISA Installations
Push-broom hyperspectral imaging
Photo - SCG Siena
Single Pixel
Spectral Bands
Spatial Pixels
FlightLine
Wavelength
Inte
nsity
Pixel Spectrum
Single Sensor FrameSeries of Sensor Frames
Push-broom hyperspectral camera
Push-broom advantages
1.Acquires all spectral information exactly at the same time - insensitive to instrument/sample movement
2.Multiplex advantage of imaging full line of pixels at the same time
3.No moving parts in the instrument – compact, reliable, stable, low maintenance.
4.With high speed AISA sensors, flexible to adapt to various mission requirements
5.The only HSI technique which practically fits to allapplications: air, field, lab and on-line
Flight mission parameters
GSD = ground sampling [m]v = aircraft speed [m/s}FOV = field of view [degree]n = # of swath pixelsFrame rate FR = v/GSD [1/s]Flying altitude A = n*GSD/2tan(FOV/2) [m]Frame integration time [s]
AISA system lab calibration
Radiometric & spectral› Conversion factor for each pixel from raw
data to spectral radiance› Centre wavelength and spectral FWHM for
each spectral band
Geometric› Focal length› Optical axis position› Possible distortion over the swath
Focus
Other standard lab tests› Linearity, Signal-to-Noise Ratio, Smile and Keystone, Stability, MTF
Data processing
Radiometric processingGeoreferencing
Atmospheric correction
Mosaic of flight linesSpectral processing for desired information
CaligeoPRO› Both interactive and batch mode
Atcor, FlaashENVI, et al
AISA software
Aisa Operating Software RS Cube
All the AISA systems use Windows-based flight operations software RSCube to
› Control hardware like image (frame) rate and exposure time.
› Display images, GPS/INS status, and other information in real-time for monitoring the progress of data collection
Aisa Operating Software RS CUbe
All AISA systems can be used in two operating modes:
› A: full hyperspectral data acquisition
› B: multispectral data acquisition at programmable wavebands Band files are created with AISA Bandage
Caligeo Software
› CaliGeo is an easy-to-use, GUI-based, interactive software package (stand alone or Envi plug-in). It allows you to fine tune your images and turn your raw AISA data into final useable products.
› With CaliGeo you are able to perform› Radiometric correction› Geo-referencing (Geometric correction)
› CaliGeo also provides the tools to automatically analyze and correct boresight errors caused by mechanical tolerances between:
› head and GPS/INS › VNIR and SWIR sensor heads
Dems
› A digital elevation model (DEM) defines the ground elevation for every single ground point, independently of the other points.
› Using a DEM is supported in CaliGeo. However, it is up to the user to provide ENVI-readable DEM data for the entire image area in a suitable format with a proper resolution
› If the DEM does not cover the image area and CaliGeo needs values outside the DEM, then CaliGeo will use the nearest DEM pixel on the edge of the DEM.
› There are no size restrictions for the DEM file. The file can cover a larger area than the raw image.
› The DEM file must be in ENVI readable format (1 channel grayscale raster data)
› To achieve a good rectification result, the ground resolution of DEM should reflect the height differences in ground (e.g. If having tall buildings etc. in the image a good ground resolution is recommended)
AISA Applications and References
Why hyperspectral?
Hyperspectral imaging is capable of seeing detailed spectral signatures needed in
› identification (like plant species, minerals) and
› quantification (like chlorophyll in water) of target characterisctics, and
› mapping their distribution.
Where hyperspectral imaging can help us?› Mineral Exploration & Geothermal Exploration, Acid Mine Drainage
› Water Quality, Off-shore Mapping, Coral Reef Health
› Forest Chemistry, Health, Inventory
› Monitoring Infrastructure Conditions
› Wetlands Health, Vegetation, Discrete vegetation mapping, andAgriculture Research and Development
› Hydrocarbon Detection, Oil&Gas Leak Detection
› Fire and Flood Risk Analysis
› Law Enforcement and Military Applications
Airborne mineral mapping
SpecTIR LLC, USAOperates three AisaDUALsystems, first obtained in2006
SWIR and LWIR hyperspectral imaging is capable of identificationof most minerals of commercialinterest, and provide quick mapping tool in geological and geothermal exploration.
High spatial resolution (1 meter) hyperspectral results for the “Buddintonite Bump” area of Cuprite, Nevada.
Airborne mineral mapping
Courtesy of SpecTIR LLC, USA
Forest inventory and health
› Fusion of hyperspectral imaging and Lidar data
› Tree height and volume› Species identification and distribution› Biomass, tree health condition, like stress
caused by pine beetle attack
University of Victoria, CanadaPurchased AisaDUAL in 2006
Forest chemistry
University of Victoria, CanadaAisaDUAL
Forest health mapping
Sarawak Forest DepartmentMalaysiaAisaEAGLE
Airborne HSI in VNIR provides sensitive and high resolution detection and mapping of fungus disease in oil palm trees
>50 km2/[email protected] m ground resolution
@50 m/s (100 knots)
Law enforcement in forest area
Sarawak Forest DepartmentMalaysiaPurchased AisaEAGLE in 2008,AisaEAGLET in 2010
Monitoring of illegal logging and encroachment by detection, classification and mapping of anomalies, like natural vs. felling gap, non-vegetative green targets
(camouflage)
Integrated geospatial system for fast enforcement response:
› hyperspectral data collection› near real-time processing and mapping› web dissemination of the tactical
information to field users
Detection of recent encroachmentsSarawak Forest DepartmentMalaysia
Drug plant detection
Processed Hyperspectral Image• Known spectral characteristics• Known background• Geo-rectified
Marijuana plants
Courtesy of SpecTIR LLC, USA
Water quality mapping
SOA (State Oceanic Administration), ChinaPurchased AisaEAGLE 2006,and two more systems in 2009
Chlorophyll, algae, and total solids mapping
Oil slick and oil in water monitoring
University of Nebraska, USAPurchased AisaEAGLE 2005 Chlorophyll-a map Phycocyanin map Total solids content
Water quality mapping
Centro de EconomiaAplicada (CEA), ChilePurchased AisaEAGLEIn 2009
All water reservoirs in Chile are frequently
mapped for organic and inorganic pollution
Environmental catastrophes
Oil spill in the Gulf of Mexico:Hyperspectral data is frequently collected with AisaDUAL by SpecTIR LLC, USA, in order to
monitor changes to health in highly sensitive coastal wetlands, andaid in future impact assessments.
‘Red mud’ flood in Hungary:Hyperspectral data is collected with AisaEAGLE by EnviroSense , Hungary.
Data courtesy of
Thermal applications AisaOWL Key Characteristics
285x200x175 mm13.5 kg< 200 W
Spatial pixels 384
Spectral range 7.7-12.4 um
Spectral resol. 100 nm
Spectral sampling 50 nm
Spectral bands 100
Smile, keystone <0.2 pix
Image rate 100 Hz
NESR@10um 20 mW/m2 sr um
Thermal Cooled – Performance
NESR SNR
AisaOWL sensor on the ground
Detection of propellant gas (1,1,1-2 tetrafluoroethane)Outdoor scan in Finland in daytime in March 2011.Ambient temperature ca -10 C.Data processed to radiance.
Codevintec Italiana Via Labus 13I-20147 MilanoTel. +39 02 4830.2175
Thank you!