On Mar 17, 3:52 pm, mankoff <mank...@[EMAIL PROTECTED]
> wrote:
> On Mar 17, 10:27 am, "mgal...@[EMAIL PROTECTED]
" <mgal...@[EMAIL PROTECTED]
> wrote:
>
> > 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
stream=
line,
> > > > > > which is the serial contour line with arrow on the contour
plot.=
>
> > > > > > some one ever mentioned that there was a script sample on the
we=
b site
> > > > > >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
o=
f both
> > > > > > 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
>
> Are all 6 images the same data? It looks like it, but it really shows
> some of the limitations of a simple vector field graphic... Wow.
Yes, all six images are from the same data. And yes, I think the
standard grid of vectors is not very useful.
Mike
--
www.michaelgalloy.com
Tech-X Cor****ation
Software Developer II
|
