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<body class='hmmessage'><div dir='ltr'><b>d u_velocity.1; v_velocity.1;mag(u_velocity.1,v_velocity.1)</b><div><b><br></b></div><div><b>Hope it helps!<br id="FontBreak"></b><br><br><span class="ecxHOEnZb ecxadL"><font style="" color="#888888">Julio N. Martínez Sánchez<br>M.C. en Oceanografía Física<br>Consultor en Sitio</font></span><div><font color="#888888">Subgerencia de Pronóstico a Mediano y Largo Plazo</font></div><div><font color="#888888">Gerencia de Meteorología y Climatología</font></div><div><font color="#888888">Servicio Meteorológico Nacional</font></div><div><font color="#888888">Ext. 3156</font></div><br><br><div><hr id="stopSpelling">From: anilku@oceanmanager.com<br>To: gradsusr@gradsusr.org<br>Date: Tue, 27 May 2014 11:45:59 +0530<br>Subject: [gradsusr] How to determine Strength of Ocean Current using Grads<br><br><style><!--
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--></style><div class="ecxWordSection1"><p class="ecxMsoNormal">Hi Grad Users,</p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal">Below is my question and work done so far on my problem, please guide me to solve.</p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal"><b>Question</b> : How to calculate the strength of ocean current data to provide different colors to different levels using Grads ?</p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal"><b>Work Done so far : </b>Ocean current data downloaded from NOAA and below is the ctlinfo from the NetCDF data</p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal"><b>dset D:\OceanData\2014\05\25\rtofs_glo_2ds_f024_daily_prog.nc</b></p><p class="ecxMsoNormal"><b>title 2D Sfc Daily Prognostic 00Z21may2014: Forecast, downloaded May 25 15:22 UTC</b></p><p class="ecxMsoNormal"><b>undef 1.26765e+30</b></p><p class="ecxMsoNormal"><b>dtype netcdf</b></p><p class="ecxMsoNormal"><b>xdef 720 linear 74.16 0.49998</b></p><p class="ecxMsoNormal"><b>ydef 360 linear -90 0.49998</b></p><p class="ecxMsoNormal"><b>zdef 1 linear 1 1</b></p><p class="ecxMsoNormal"><b>tdef 1 linear 00Z25MAY2014 1mn</b></p><p class="ecxMsoNormal"><b>vars 2</b></p><p class="ecxMsoNormal"><b>u_velocity=>u_velocity 1 t,z,y,x eastward_sea_water_velocity (m/s)</b></p><p class="ecxMsoNormal"><b>v_velocity=>v_velocity 1 t,z,y,x northward_sea_water_velocity (m/s)</b></p><p class="ecxMsoNormal"><b>endvars</b></p><p class="ecxMsoNormal"><b> </b></p><p class="ecxMsoNormal">Am using below selected commands to generate vectors, and automatically it gives in strength in terms of length of arrow.</p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal"><b>sdfopen D:/ OceanData /2014/05/25/rtofs_glo_2ds_f024_daily_prog.nc</b></p><p class="ecxMsoNormal"><b>d u_velocity.1; v_velocity.1</b></p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal">if I make vector’s scaling fixed to 0.015 using ‘<b>set arrscl 0.15</b>‘. </p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal">So how can I calculate strength of vectors to provide them colors according to levels ?<b></b></p><p class="ecxMsoNormal"> </p><p class="ecxMsoNormal"><b><span style="color:#215868;">Thanks & Regards</span></b></p><p class="ecxMsoNormal"><b><span style="color:#215868;">Anil Kumar</span></b><b><span style="color:#00A1DA;"></span></b></p><p class="ecxMsoNormal"> </p></div><br>_______________________________________________
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