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Page 1ASAR Validatoin Review - ESRIN – 9-13 December 2002
Ocean geophysical results from ASAR
Geophysical overview
ocean spectra : the isidore case
inversion on single look complex images
prospective studies : doppler anomaly
conclusions
Page 2ASAR Validatoin Review - ESRIN – 9-13 December 2002
annual swell index
annual significant wave height
Page 3ASAR Validatoin Review - ESRIN – 9-13 December 2002
swell index for autumn season
Page 4ASAR Validatoin Review - ESRIN – 9-13 December 2002
Page 5ASAR Validatoin Review - ESRIN – 9-13 December 2002
Imagette visualisation
Page 6ASAR Validatoin Review - ESRIN – 9-13 December 2002
Imagette spectrum visualisation
Page 7ASAR Validatoin Review - ESRIN – 9-13 December 2002
Sar inversion (esa algorithm)
Page 8ASAR Validatoin Review - ESRIN – 9-13 December 2002
Collocated WAM spectrum
Page 9ASAR Validatoin Review - ESRIN – 9-13 December 2002
Hurricane isidore
from NOAA Sept 23
ASAR/MERIS Sept 21
Page 10ASAR Validatoin Review - ESRIN – 9-13 December 2002
ASAR Wave Mode, Level 2 algorithm
Page 11ASAR Validatoin Review - ESRIN – 9-13 December 2002
ASAR intensity image
during Valparaiso experiment (cetp)
oct 26
Page 12ASAR Validatoin Review - ESRIN – 9-13 December 2002
Page 13ASAR Validatoin Review - ESRIN – 9-13 December 2002
Sigma0 ECMWF (dB)
calibration constant : -47.55
dB
based on september
data
Imag
ett
e m
ean
in
ten
sit
y (
dB
)
Page 14ASAR Validatoin Review - ESRIN – 9-13 December 2002
doppler centroid anomaly
Two different tracks
Page 15ASAR Validatoin Review - ESRIN – 9-13 December 2002
Doppler centroid anomaly on Wave mode level1b (descending tracks)
Page 16ASAR Validatoin Review - ESRIN – 9-13 December 2002
Doppler centroid anomaly (ascending tracks)
Page 17ASAR Validatoin Review - ESRIN – 9-13 December 2002
ASAR intensity image
during Valparaiso experiment (cetp)
oct 26
Page 18ASAR Validatoin Review - ESRIN – 9-13 December 2002
(triggered by a doppler-map case study from Andrea Monti-Guarnieri
in 2000)Doppler anomaly map
some block processing issues !
Page 19ASAR Validatoin Review - ESRIN – 9-13 December 2002
Doppler centoid (Hz)
Land
Ocean
Page 20ASAR Validatoin Review - ESRIN – 9-13 December 2002
Comparison with a similar ERS 2 SLC image doppler centroid analysis
Page 21ASAR Validatoin Review - ESRIN – 9-13 December 2002
Doppler estimated on range compressed data
saturation on rapidly changing backscatter area !
Page 22ASAR Validatoin Review - ESRIN – 9-13 December 2002
Doppler estimated on range and azimuth compressed data
Wind
Page 23ASAR Validatoin Review - ESRIN – 9-13 December 2002
Doppler anomaly chart
Page 24ASAR Validatoin Review - ESRIN – 9-13 December 2002
Page 25ASAR Validatoin Review - ESRIN – 9-13 December 2002
• CONCLUSION
• overall very excellent quality of asar data
• need for another 3 month validation with buoys and model for level 2
• doppler anomaly estimation require precise orbit and attitude monitoring
