On Mar 16, 11:22 pm, wfz...@[EMAIL PROTECTED]
wrote:
> On 3=D4=C214=C8=D5, =C9=CF=CE=E74=CA=B132=B7=D6, Chris Torrence
<gorth...@[EMAIL PROTECTED]
> wrote:
>
> > On Mar 7, 7:55 am, "Kenneth P. Bowman" <k-bow...@[EMAIL PROTECTED]
> wrote:
>
> > > In article
> > > <92bef8cb-bd54-48b7-b54c-2ff9f4f75...@[EMAIL PROTECTED]
>,
>
> > > wenfang_z...@[EMAIL PROTECTED]
wrote:
> > > > Hi,all
> > > > I want to draw the wind streamline map,and I try many methods
> > > > described in the forum, but some are wind vectors not the
streamline=
,
> > > > which is the serial contour line with arrow on the contour plot.
>
> > > > some one ever mentioned that there was a script sample on the web
si=
te
> > > >http://www.metvis.com.au/idl/
> > > > but i can't get access to it.
>
> > > > so if there anybody who can load that web site and give a copy of
bo=
th
> > > > the script and the streamline image for me?
>
> > > > I will appreciate your help!
>
> > > > wenfang
>
> > > Here is a sample code to plot 2-D streamlines using VEL.
>
> > > By default VEL chooses the initial points randomly, but the
> > > source code is available if you want to change that.
>
> > > Ken Bowman
>
> > > PRO STREAMLINE_DEMO
>
> > > n =3D 50
> > > x =3D FINDGEN(n)/(n-1)
> > > y =3D FINDGEN(n)/(n-1)
>
> > > xx =3D REBIN(x, n, n)
> > > yy =3D REBIN(REFORM(y, 1, n), n, n)
>
> > > u =3D -SIN(!PI*xx)*COS(!PI*yy)
> > > v =3D COS(!PI*xx)*SIN(!PI*yy)
>
> > > VEL, u, v, NVECS =3D 100, NSTEPS =3D 100, length =3D 0.5
>
> > > END
>
> > Following on from Ken's example, you might also try,
>
> > iVector, u, v, x, y, /STREAMLINES, STREAMLINE_NSTEPS=3D25
>
> > -Chris
> > ITTVIS- =D2=FE=B2=D8=B1=BB=D2=FD=D3=C3=CE=C4=D7=D6 -
>
> > - =CF=D4=CA=BE=D2=FD=D3=C3=B5=C4=CE=C4=D7=D6 -
>
> thanks for all response from you.
> now I am a litttle comfused, what kind of line can be called as wind
> streamline?
> what I want is the consecutive line with arrow, something like the
> contour plot line with arrow, not the small lines with arrow,I don't
> know how to describe it more clear? I have a sample image of wind
> streamline ,which is what I want, but how I can put it on the forum so
> all of you can have a look and understand what I mean.
I think you are talking about OSTR (image-guided streamlines) in this
diagram:
http://michaelgalloy.com/wp-content/uploads/2008/03/flow.png
I have thought about making implementations of some of the
visualizations in that diagram. I have a (very slow) implementation
for LIC:
http://michaelgalloy.com/2007/12/09/lic-flow-code.html
Mike
--
www.michaelgalloy.com
Tech-X Cor****ation
Software Developer II
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