Hyperspectral remote sensing - Sensors

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Hyperspectral remote sensing - Sensors. Contact: mirza.waqar@seecs.edu.pk. Mirza Muhammad Waqar. Contents. Hyperspectral Instruments AVIRIS (Airborne Visible Infrared Imaging Spectrometer) CASI‐2 (Compact Airborne Spectrographic Imager‐2) Hyperion HyMap CASI. - PowerPoint PPT Presentation

Transcript of Hyperspectral remote sensing - Sensors

Prilimanary Defense Presentation

Mirza Muhammad WaqarHyperspectral remote sensing - Sensors1Contact: mirza.waqar@seecs.edu.pkThe topic of my research is Georferencing of images by exploiting geometric distortions in stereo images of UK DMC. And this is my preliminary defense presentation.1Contents2Hyperspectral InstrumentsAVIRIS (Airborne Visible Infrared Imaging Spectrometer)CASI2 (Compact Airborne Spectrographic Imager2)HyperionHyMapCASI

These are the contents of my presentation.23

Hyperspectral Instruments4AVIRIS (Airborne Visible Infrared Imaging Spectrometer)MODIS (Moderate Resolution Imaging Spectroradiometer)CASI2 (Compact Airborne Spectrographic Imager2)HyperionDaedelus InstrumentsHyMapCASI

AVIRIS (Airborne Visible Infrared Imaging Spectrometer)5The 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.Cont6On 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 bitNote7AVIRIS 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)9The 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 mHyperion10The 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

Cont12Features-Sensor typePushbroomOrbitSun synchronous 1 minute behind LandsatSpectral bands220 10 nmSpectral coverage400 nm (blue) and 2500 nm (mid-IR)Radiometric Resolution12 bitSpatial Resolution 30 mLEISA13Features-Spatial Resolution250 mSpectral Resolution246 in MIR portionSwath185 kmApplicationsAtmospheric Correction of other sensorsHyMap14HyVista Corporation, of Sydney, Australia, commercially operates a 128-band whiskbroom hyperspectral scanner.

It operates in the familiar spectral range of 400 - 2500 nmbut 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.Applications of Hyperspectral Data15Atmosphere: water vapor, cloud properties, aerosolsEcology: chlorophyll, leaf water, cellulose, pigmentsGeology: mineral and soil typesCoastal waters: chlorophyll, phytoplankton, dissolvedOrganic materials, suspended sediments, bathymetrySnow/ice: snow cover fraction, grain size, meltingBiomass burning: subpixel temperatures, smokeCommercial: mineral exploration, agriculture and forest production

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