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EMIRAD Data

This campaign aims to validate the SMOS SM L2 prototype processor and investigate various radiometry effects, including water interception, dew, sun glint over vegetation, scaling between different pixel sizes, and topography effects. The campaign utilizes the EMIRAD L-band radiometer on board the SERA aircraft, with specific flight patterns and data resolution.

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EMIRAD Data

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  1. EMIRAD Data coSMOS2 campaign

  2. coSMOS2 campaign objectives • Validation of SMOS SM L2 prototype processor • Assimilation of root zone moisture • Investigation into the effect of water interception and dew on radiometry • Investigation into the effect of sun glint over vegetation on radiometry • Investigation into scaling between different pixel sizes • Investigation into the effect of topography on radiometry

  3. instrument • EMIRAD L-band radiometer (TUD) on board SERA aircraft (ARA) • 1 antenna (horn) @ nadir, the other @ 40° • Nadir horn has 680 m footprint for 1000 m flight altitude • 40 deg horn has 714 m footprint across track and 932 m footprint along track for 1000 m flight altitude. • Same calibration over lake as PLMR

  4. flight patterns • ASSI: assimilation over all SM stations • SCAL: scaling over Krui + Merriwa catchments • 36 1km spaced parallel lines @ 1830 m (1250 m resolution) • WATER: dew effect only • GLINT: large range of sun-horn geometry

  5. ASSI flight pattern • Fly over all farm sites @ 500 m • Providing data @ 300 m resolution • 5km lines

  6. 1 km separation trees grassland GLINT flight pattern • 2 flight lines (at least 5km long) in the same azimuth as the sun’s position when the sun has an elevation of 40 degrees. • 6 “dive flights” to increase obs angle range • 4+4+3 lines; 7:30-10:00

  7. WATER flight pattern • Initially scheduled over Ilogan + Roscommon • Flown over Cullingral + Midlothian to take profit of extended vegetation sampling • 1 line flown 23 times from 5:50 AM till 10:10

  8. Flight calendar 4 lines 22 lines

  9. Data processing • TUD+ESA busy with OS campaign • First Tb maps produced by the end of this month • See poster by M. Berger @ EGU

  10. ESA Data • Envisat - MERIS: MERIS full resolution (300m), geolocated and calibrated TOA radiance (300m) • Envisat - ASAR: Alternating Polarisation Mode Product - two coregistered images HH/VV - 30m spatial resolution • Envisat AATSR: calibrated and geolocated images of brightness temperature (for the three infra-red channels) or reflectance (for the near-visible and visible channels), together with cloud and land identification • CHRIS/PROBA: Mode 1 data: set of 5 images acquired under different angular views, 62 spectral bands in VIS/NIR - about 34m spatial resolution.

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