Good morning everyone,<br><br>I'm generating wave analysis models, but I'm having a tough time showing the mean-wave (or
primary) wave direction arrows.
<br>
<br>
The vars in the Grib are:<br>
-------------------------------------------------<br>
DIRPWsfc �0 107,1,1 �** surface Primary wave direction [deg]<br>
DIRSWsfc �0 109,1,1 �** surface Secondary wave direction [deg]<br>
HTSGWsfc �0 100,1,1 �** surface Sig height of wind waves and swell [m]<br>
PERPWsfc �0 108,1,1 �** surface Primary wave mean period [s]<br>
PERSWsfc �0 110,1,1 �** surface Secondary wave mean period [s]<br>
UGRDsfc �0 33,1,1 �** surface u wind [m/s]<br>
VGRDsfc �0 34,1,1 �** surface v wind [m/s]<br>
WDIRsfc �0 31,1,1 �** surface Wind direction [deg]<br>
WINDsfc �0 32,1,1 �** surface Wind speed [m/s]<br>
WVDIRsfc �0 101,1,1 �** surface Direction of wind waves [deg]<br>
WVPERsfc �0 103,1,1 �** surface Mean period of wind waves [s]<br>
<br>For displaying wind vector arrows it's straightforward as there are U and V variables (UGRDsfc and VGRDsfc) for the zonal and meridional components. Displaying primary wave direction though seems more elusive, yet I see it done on many models such as the following:<br>
<a href="https://www.fnmoc.navy.mil/ww3_cgi/dynamic/ww3.w.npac.sig_wav_ht.000.gif">https://www.fnmoc.navy.mil/ww3_cgi/dynamic/ww3.w.npac.sig_wav_ht.000.gif</a><br><br>...which was generated using GrADS by FNMOC.<br><br>
Any help you can provide would be greatly appreciated, and thank you for your time.<br><br>--<br>Nathan Cool<br><a href="mailto:nathan@nathancool.com">nathan@nathancool.com</a><br>