FN Archimer Export Format
PT J
TI A C-Band Geophysical Model Function for Determining Coastal Wind Speed Using Synthetic Aperture Radar
BT 
AF LU, Yiru
   ZHANG, Biao
   PERRIE, William
   MOUCHE, Alexis
   LI, Xiaofeng
   WANG, He
AS 1:1;2:1;3:2;4:3;5:4;6:5;
FF 1:;2:;3:;4:PDG-ODE-LOPS-SIAM;5:;6:;
C1 Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing 210044, Jiangsu, Peoples R China.
   Fisheries & Oceans Canada, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada.
   Inst Francais Rech Exploitat Mer, Lab Oceanog Phys Spatiale, F-29280 Plouzane, France.
   NOAA, Global Sci & Technol Inc, Natl Environm Satellite Data & Informat Serv, College Pk, MD 20746 USA.
   State Ocean Adm, Natl Ocean Technol, Tianjin 300171, Peoples R China.
C2 UNIV NANJING, CHINA
   MPO BEDFORD INST OCEANOG, CANADA
   IFREMER, FRANCE
   NOAA, USA
   STATE OCEAN ADM, CHINA
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer jusqu'en 2018
   copubli-int-hors-europe
   copubli-sud
IF 3.392
TC 55
UR https://archimer.ifremer.fr/doc/00452/56390/60555.pdf
LA English
DT Article
DE ;Coastal wind speed;geophysical model function (GMF);synthetic aperture radar (SAR)
AB A new geophysical model function (GMF), called C_SARMOD2, has been developed to relate high-resolution C-band normalized radar cross section (NRCS), acquired in VV polarization over the ocean, to the 10-m height wind speed. A total of 3078 RADARSAT-2 and Sentinel-1A VV-polarized synthetic aperture radar (SAR) images, acquired under different wind speed conditions, were collocated with in situ buoy measurements. The paired dataset was used to derive transfer functions and coefficients of C_SARMOD2, and then to validate the wind speed retrievals. The comparison between SAR-retrieved wind speeds and buoy measurements show almost no bias and a root mean square error of 1.84 m/s. Two representative quad-and dual-polarization SAR images, acquired from coastal regions, are used as case studies to examine C_SARMOD2 performances. The case study and statistical validation results suggest that the proposed C_SARMOD2 has the potential to measure coastal wind speeds at subkilometer resolutions. Although derived from low resolution NRCS measurements, this study also confirms the great robustness of CMOD5.N and recent CMOD7 when applied to SAR data. In addition, it shows that with the new generation of SAR satellite-borne sensors, it is no longer mandatory to rely on scatterometers in order to build a GMF, which will be used for SAR applications. Such an approach is particularly important in view of the upcoming RADARSAT Constellation Mission with new polarization configurations. Moreover, it also opens new perspectives on the derivation of GMFs in HH-polarization. However, these results also suggest that for coastal areas, the increase of the resolution to define the GMF is less important than adding other geophysical parameters to improve wind retrieval performance. This advocates for the necessity of revisiting the methodologies for ocean surface wind speed measurements in coastal areas. 
PY 2018
PD JUN
SO Ieee Journal Of Selected Topics In Applied Earth Observations And Remote Sensing
SN 1939-1404
PU Ieee-inst Electrical Electronics Engineers Inc
VL 11
IS 7
UT 000440035600022
BP 2417
EP 2428
DI 10.1109/JSTARS.2018.2836661
ID 56390
ER

EF