[gradsusr] How to determine Strength of Ocean Current using Grads

[Anil Kumar Sharma]

Thanks Julio N. Martínez Sánchez.


On Tue, May 27, 2014 at 8:05 PM, Julio Martinez <julioms24 at hotmail.com>wrote:

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