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Mirza Muhammad Waqar

HYPERSPECTRAL REMOTE SENSING - SENSORS

Contact: mirza.waqar@seecs.edu.pk

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Contents

Hyperspectral Instrumentso AVIRIS (Airborne Visible Infrared Imaging

Spectrometer)o CASI 2 (Compact Airborne Spectrographic Imager 2)‐ ‐o Hyperiono HyMapo CASI

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Hyperspectral Instruments4

1. AVIRIS (Airborne Visible Infrared Imaging Spectrometer)

2. MODIS (Moderate Resolution Imaging Spectroradiometer)

3. CASI 2 ‐ (Compact Airborne Spectrographic Imager 2)‐

4. Hyperion

5. Daedelus Instruments

6. HyMap

7. CASI

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AVIRIS (Airborne Visible Infrared Imaging Spectrometer)

The Airborne Visible InfraRed Imaging Spectrometer (AVIRIS) was designed and built by the NASA Jet Propulsion Laboratory (JPL).

It is a whiskbroom scanner, and it flies on several airborne platforms. 

The swath and spatial resolution depend on the flying height and over-ground speed of the aircraft.

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Cont…

On the NASA ER-2 jet at 20 km above MSL, AVIRIS covers an 11 km swath at 20 m GSD.

On a DeHaviland Twin Otter turboprop at 4 km AGL, AVIRIS covers a 2 km swath at 4 m GSD.

224 contiguous spectral channels

Radiometric resolution: 12 bit

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Note

AVIRIS is flown primarily for NASA-funded scientists and researchers. Graduate students can obtain small amounts of existing AVIRIS data at no cost.

http://aviris.jpl.nasa.gov/data/grad_research.html

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CASI-2 (Compact Airborne Spectrographic Imager-2)

The Compact Airborne Imaging Spectrometer (CASI) is built by ITRES Research Ltd., of Canada

 It can collect data in 14-bit format for 288 bands at 2.5 nm nomi

However, the overall spectral range is limited to 650 nm, which is adjustable anywhere between 400 nm (blue) and 1050 nm (near-IR).nal intervals.

GSD in the range of 25 cm - 1.5 m

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Hyperion

The Hyperion hyperspectral imaging sensor flies on the NASA Earth Observing-1 (EO-1) spacecraft launched in late 2000.

Pushbroom technology gives Hyperion a longer target look time than a scanning radiometer, which helps to overcome the signal-to-noise problem.

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Cont…

Features -

Sensor type Pushbroom

Orbit Sun synchronous – 1 minute behind Landsat

Spectral bands 220 10 nm

Spectral coverage 400 nm (blue) and 2500 nm (mid-IR)

Radiometric Resolution 12 bit

Spatial Resolution 30 m

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LEISA

Features -

Spatial Resolution 250 m

Spectral Resolution 246 in MIR portion

Swath 185 km

Applications Atmospheric Correction of other sensors

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HyMap

HyVista Corporation, of Sydney, Australia, commercially operates a 128-band whiskbroom hyperspectral scanner.

 It operates in the familiar spectral range of 400 - 2500 nm but with a bandwidth of 15-20 nm rather than 10 as for

AVIRIS and Hyperion

 It records data in 12 - 16 bit format.  Spatial resolution range 3-10 m.

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Applications of Hyperspectral Data

1. Atmosphere: water vapor, cloud properties, aerosols2. Ecology: chlorophyll, leaf water, cellulose, pigments

3. Geology: mineral and soil types

4. Coastal waters: chlorophyll, phytoplankton, dissolved

5. Organic materials, suspended sediments, bathymetry6. Snow/ice: snow cover fraction, grain size, melting

7. Biomass burning: subpixel temperatures, smoke8. Commercial: mineral exploration, agriculture and forest

production

Questions & Discussion