1. Mirza Muhammad Waqar HYPERSPECTRAL REMOTE SENSING - SENSORS 1 Contact: mirza.waqar@seecs.edu.pk

2. Contents 2 Hyperspectral Instruments o AVIRIS (Airborne Visible Infrared Imaging Spectrometer) o CASI‐2 (Compact Airborne Spectrographic Imager‐2) o Hyperion o HyMap o CASI

3. 3

4. Hyperspectral Instruments 4 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

5. AVIRIS (Airborne Visible Infrared Imaging Spectrometer) 5  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.

6. Cont… 6  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

7. Note 7  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.ht ml http://aviris.jpl.nasa.gov/data/grad_research.ht ml

8. 8

9. CASI-2 (Compact Airborne Spectrographic Imager-2) 9  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

10. Hyperion 10  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.

11. 11

12. Cont… 12 Features- Sensor typePushbroom OrbitSun synchronous – 1 minute behind Landsat Spectral bands220 10 nm Spectral coverage400 nm (blue) and 2500 nm (mid-IR) Radiometric Resolution12 bit Spatial Resolution30 m

13. LEISA 13 Features- Spatial Resolution250 m Spectral Resolution246 in MIR portion Swath185 km ApplicationsAtmospheric Correction of other sensors

14. HyMap 14  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.

15. Applications of Hyperspectral Data 15 1. Atmosphere: water vapor, cloud properties, aerosols 2. Ecology: chlorophyll, leaf water, cellulose, pigments 3. Geology: mineral and soil types 4. Coastal waters: chlorophyll, phytoplankton, dissolved 5. Organic materials, suspended sediments, bathymetry 6. Snow/ice: snow cover fraction, grain size, melting 7. Biomass burning: subpixel temperatures, smoke 8. Commercial: mineral exploration, agriculture and forest production

16. Questions & Discussion