Sentinel-1 SAR Wave Mode Monthly Quality Assessment L2 Radar parameters component

Sentinel 1 Wave Mode Quality Assessement L2 Radar parameters

In this section radar parameters (such as backscatter, normalized variance, cut-off values, incidences angles) are monitored.

Backscatter


 Backscatter global maps

http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/oswnrcs_backscatter_map_glo_{yyyy}{MM}-{yyyy}{MM}-hh-WV1.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/oswnrcs_backscatter_map_glo_{yyyy}{MM}-{yyyy}{MM}-vv-WV1.png
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Global map of backscatter value [dB] WV1 HH Global map of backscatter value [dB] WV1 VV
http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/oswnrcs_backscatter_map_glo_{yyyy}{MM}-{yyyy}{MM}-hh-WV2.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/oswnrcs_backscatter_map_glo_{yyyy}{MM}-{yyyy}{MM}-vv-WV2.png
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Global map of backscatter value [dB] WV2 HH Global map of backscatter value [dB] WV2 VV

 

http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/WV1_hh_sar_backscatter_histo_glo_{yyyy}{MM}-{yyyy}{MM}.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/WV2_hh_sar_backscatter_histo_glo_{yyyy}{MM}-{yyyy}{MM}.png
Histogram of WV1 HH backscatter values [dB] Histogram of WV2 HH backscatter values [dB]
http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/WV1_vv_sar_backscatter_histo_glo_{yyyy}{MM}-{yyyy}{MM}.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/WV2_vv_sar_backscatter_histo_glo_{yyyy}{MM}-{yyyy}{MM}.png
Histogram of WV1 VV backscatter values [dB] Histogram of WV2 VV backscatter values [dB]

 

 

Backscatter comparisons

In this part, the WW3 backscatter values refer to the output of the empirical CMOD-IFR2 model fed with ECMWF winds (speed and directions). Incidence angle values of WV points are used to estimate CMOD-IFR2 outputs.

 

Comparisons between backscatter values of OCN data and WW3 (i.e. CMOD-IFR2+ECMWF wind) for different wind directions

Kurtosis

Skewness

http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_skewness_map_glo_{yyyy}-{MM}_WV1_hh.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_skewness_map_glo_{yyyy}-{MM}_WV1_vv.png
Global map of skewness WV1 HH Global map of skewness WV1 VV
http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_skewness_map_glo_{yyyy}-{MM}_WV2_hh.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_skewness_map_glo_{yyyy}-{MM}_WV2_vv.png
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Global map of skewness WV2 HH Global map of skewness WV2 VV

 

 

Incidences angles

 

 

Global distribution of the SAR OCN azimuth cutoff values

Global map of SAR OCN azimuth cut-off values (left), and similar coverage of co-located ECMWF wind speed values (right) 

Global distribution of the SAR OCN range cutoff values

 

 

Analysis of the normalized variance

http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/swh_nv_scatterplot_glo_{yyyy}-{MM}.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_nv_map_glo_{yyyy}-{MM}.png

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Scatter plot of normalized variance versus swell height. 

Global map of normalized variance.
http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_nv_map_glo_{yyyy}-{MM}_WV1_hh.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_nv_map_glo_{yyyy}-{MM}_WV1_vv.png
Normalized variance for incidence: WV1 polarisation HH Normalized Variance map Normalized variance for incidence: WV1 polarisation VV Normalized Variance map
http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_nv_map_glo_{yyyy}-{MM}_WV2_hh.png http://www.ifremer.fr/cersat1/exp/sarqc/sentinel1/l2/monthly/S1A_WV_OCN__2S/calval_plots/{yyyy}{MM}/sar_nv_map_glo_{yyyy}-{MM}_WV2_vv.png
Normalized variance for incidence: WV2 polarisation HH Normalized Variance map Normalized variance for incidence: WV2 polarisation VV Normalized Variance map

OCN significant wave height vs. image normalized variance