Re: [ferret_users] strange arrows for wind direction

[CARLOS ROMÁN CASCÓN <carlosromancascon@xxxxxxxxxx>]

Dear Anley,

thank you for the reply, but it doesn't work yet. I have tried with /ASPECT and changing the relation between x and y axis. Heigth is in meters. This is the whole script:

Thank you.

Carlos

use onda3.nc

let /title="full geopotential at layer boundaries" /unit="m" geopot_model = (phb+ph)/9.81
let staggered_z=z[gz=bottom_top_stag]-0.5
define axis /z my_staggered_z=staggered_z
let geopot_stag=geopot_model[gz=my_staggered_z@asn]
let /title=”Heigth” /unit=”m” geopotential_f=geopot_stag[gz=bottom_top]

!------------------------------------------------------------
PPL axlsze 0.16,0.16
PPL labset 0.16,0.16,0.16,0.16
PPL shakey 0.16
PPL title temperature
PPL SHASET RESET
!--------------------------------------------------------------

let /title="viento" viento=((u^2+v^2)^0.5)
let direccion=atan(u/v)
let my_t='T'
let theta=my_t+300
let ptot=(PB+P)/100
let temp=(theta*((ptot/1000)^(2/7)))-273.15

cancel mode logo

set region /j=20:70/i=60/l=600
REPEAT /l=600:900 (vector /ASPECT /vlim=400:4000 u,v,xlat,geopotential_f);

On 01/10/2013 08:31 PM, Ansley Manke wrote:

Carlos,
Have a look at how your plot changes with the  vector/ASPECT qualifier.  What are the units of height?  Meters? At 43N a degree of latitude is about 5500 m, so the scale on your two plotting axes isn't too terribly different, but that may account for the funny looking arrow heads.

Ansley

On 1/10/2013 8:36 AM, CARLOS ROMÁN CASCÓN wrote:

Hi all,

why do I obtain this kind of arrow when plotting wind direction from "u" and "v" components?
why I can't see a "normal" arrow?

This is what I use:
 
set region /l=750/j=30:70/i=60/
vector /vlim=400:7000 u,v,xlat,geopotential_f;

Thanks in advance

Regards

Carlos

-- 
Carlos Román Cascón
Departamento de Geofísica y Meteorología
Facultad de Ciencias Físicas
Universidad Complutense de Madrid
Madrid, Spain. 

-- 
Carlos Román Cascón
Departamento de Geofísica y Meteorología
Facultad de Ciencias Físicas
Universidad Complutense de Madrid
Madrid, Spain.