In this page, analysis are performed with respect to wave mode beam (wv1 or wv2) and pass (ascending or descending). Results are presented in 4 columns for WV1/Ascending, WV1/Descending, WV2/Ascending and WV2/descending - from left to right. Some sections have "Details" sub-sections. They are for advanced users, but access is not restricted.
Data Set Statistics
This section presents general information on the data set such as its geographical and temporal distributions.
Geographical Distribution of Doppler Measurements
This section presents the geographical distribution of Doppler measurements used in this page for our analysis. Indeed, it may be interested to know how homgeneous in space is the sampling. It also allow a posteriori monitoring of the data acquisition plan.
Temporal Distribution of Doppler Measurements
This section presents the temporal distribution of Doppler measurements used in this page for our analysis. Indeed, it may be interested to know how homgeneous in time is the sampling. It also allow a posteriori monitoring of the possible stops in the Wave Mode acquisitions.
Geographical Distribution of Incidence Angles
It presents the geographical distribution of the incidence angles for the considered month. Values around 23° are expected for WV1 and around 36° for WV2.
Distribution of incidence Angles Values
It presents the distribution of the incidence angles for the considered month. Values around 23° are expected for WV1 and around 36° for WV2.
Geographical Distribution of ESA L2 Geophysical Doppler & Sea State
ESA L2 Geophysical Doppler
Geophysical Doppler is defined as the Doppler centroid estimated from L1 products corrected from the geometry (Doppler shift due to attitude from the geometry knowledge as given by quaternions) and antenna (Doppler shift due to TRM drifts, failures, misalignments, etc...) contributions.
ECMWF Wind speed component projected in the line of sight of SAR antenna (Radial Wind Speed)
ECMWF Wind speed component projected in the line of sight of SAR antenna is the ECMWF wind speed times the cosinus of the antenna look angle with respect to the wind direction. As a results, when the wind blows toward the antenna, radial wind speed is expected to be positive. When the wind blows aways from the antenna, radial wind speed is expected to be negative. When the wind blows perpendicular to the antenna, radial wind speed is expected to be null.
Geographical Distribution of Observed Doppler (not correction applied)
Estimated bias between Observed Doppler and Expected Geophysical Doppler
Geographical Distribution of the Data used for Doppler bias Estimates
Geographical Distribution of Corrected Geophysical Doppler (rough geophysically based correction)
Relationship between ESA L2 Geophysical Doppler and Sea State
ESA L2 Geophysical Doppler Versus Radial Wind Speed - 2D Histogram
ESA L2 Geophysical Doppler Versus Azimuth Wind Direction for a 7 m/s wind speed - 2D Histogram
ESA L2 Geophysical Doppler Versus Radial Wind Speed with respect to latitudes (color code)
ESA L2 Observed Doppler (not correction applied) Versus Radial Wind Speed with respect to latitudes (color code)
Corrected (rough geophysically based correction) Geophysical Doppler Versus Radial Wind Speed with respect to latitudes (color code)
ESA L2 Geophysical Doppler Versus Azimuth Wind Direction with respect to latitudes (color code)
ESA L2 Observed Doppler (not correction applied) Versus Azimuth Wind Direction with respect to latitudes (color code)
Corrected (rough geophysically based correction) Geophysical Doppler Versus Azimuth Wind Direction with respect to latitudes (color code)
