| how to draw streamline [message #59208] |
Thu, 06 March 2008 19:08  |
wenfang_zhao
Messages: 1
Registered: March 2008
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Junior Member |
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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 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 of both
the script and the streamline image for me?
I will appreciate your help!
wenfang
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| Re: how to draw streamline [message #59276 is a reply to message #59208] |
Mon, 17 March 2008 23:56  |
wfzhao
Messages: 11
Registered: March 2008
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Junior Member |
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On 3月18日, 上午6时31分, "mgal...@gmail.com" <mgal...@gmail.com> wrote:
> On Mar 17, 3:52 pm, mankoff <mank...@gmail.com> wrote:
>
>
>
>
>
>> On Mar 17, 10:27 am, "mgal...@gmail.com" <mgal...@gmail.com> wrote:
>
>>> On Mar 16, 11:22 pm, wfz...@bjmb.gov.cn wrote:
>
>>>> On 3月14日, 上午4时32分, Chris Torrence <gorth...@gmail.com> wrote:
>
>>>> > On Mar 7, 7:55 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
>
>>>> > > In article
>>>> > > < 92bef8cb-bd54-48b7-b54c-2ff9f4f75...@s8g2000prg.googlegroups .com >,
>
>>>> > > wenfang_z...@hotmail.com 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 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 of 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 = 50
>>>> > > x = FINDGEN(n)/(n-1)
>>>> > > y = FINDGEN(n)/(n-1)
>
>>>> > > xx = REBIN(x, n, n)
>>>> > > yy = REBIN(REFORM(y, 1, n), n, n)
>
>>>> > > u = -SIN(!PI*xx)*COS(!PI*yy)
>>>> > > v = COS(!PI*xx)*SIN(!PI*yy)
>
>>>> > > VEL, u, v, NVECS = 100, NSTEPS = 100, length = 0.5
>
>>>> > > END
>
>>>> > Following on from Ken's example, you might also try,
>
>>>> > iVector, u, v, x, y, /STREAMLINES, STREAMLINE_NSTEPS=25
>
>>>> > -Chris
>>>> > ITTVIS- 隐藏被引用文字 -
>
>>>> > - 显示引用的文字 -
>
>>>> 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 Corporation
>>> 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 Corporation
> Software Developer II- 隐藏被引用文字 -
>
> - 显示引用的文字 -
thanks for you response.
I think OSTR and GSTR are what I need.
and I download the source code from your web site named mg_lic.pro and
run in IDL, but it causes my cpu 100% and my computer crash down. so
may I use it correctly or I can adjust some parameter to decrease the
data?
for the first gird, I already do it successfully on the countour
plot, which means to overplot wind grid arrow on the contour plot map.
wenfang
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| Re: how to draw streamline [message #59285 is a reply to message #59208] |
Mon, 17 March 2008 15:31 |
Michael Galloy
Messages: 1114
Registered: April 2006
|
Senior Member |
|
|
On Mar 17, 3:52 pm, mankoff <mank...@gmail.com> wrote:
> On Mar 17, 10:27 am, "mgal...@gmail.com" <mgal...@gmail.com> wrote:
>
>> On Mar 16, 11:22 pm, wfz...@bjmb.gov.cn wrote:
>
>>> On 3月14日, 上午4时32分, Chris Torrence <gorth...@gmail.com> wrote:
>
>>>> On Mar 7, 7:55 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
>
>>>> > In article
>>>> > < 92bef8cb-bd54-48b7-b54c-2ff9f4f75...@s8g2000prg.googlegroups .com >,
>
>>>> > wenfang_z...@hotmail.com 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 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 of 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 = 50
>>>> > x = FINDGEN(n)/(n-1)
>>>> > y = FINDGEN(n)/(n-1)
>
>>>> > xx = REBIN(x, n, n)
>>>> > yy = REBIN(REFORM(y, 1, n), n, n)
>
>>>> > u = -SIN(!PI*xx)*COS(!PI*yy)
>>>> > v = COS(!PI*xx)*SIN(!PI*yy)
>
>>>> > VEL, u, v, NVECS = 100, NSTEPS = 100, length = 0.5
>
>>>> > END
>
>>>> Following on from Ken's example, you might also try,
>
>>>> iVector, u, v, x, y, /STREAMLINES, STREAMLINE_NSTEPS=25
>
>>>> -Chris
>>>> ITTVIS- 隐藏被引用文字 -
>
>>>> - 显示引用的文字 -
>
>>> 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 Corporation
>> 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 Corporation
Software Developer II
|
|
|
|
| Re: how to draw streamline [message #59290 is a reply to message #59208] |
Mon, 17 March 2008 14:52 |
mankoff
Messages: 131
Registered: March 2004
|
Senior Member |
|
|
On Mar 17, 10:27 am, "mgal...@gmail.com" <mgal...@gmail.com> wrote:
> On Mar 16, 11:22 pm, wfz...@bjmb.gov.cn wrote:
>
>
>
>> On 3月14日, 上午4时32分, Chris Torrence <gorth...@gmail.com> wrote:
>
>>> On Mar 7, 7:55 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
>
>>>> In article
>>>> < 92bef8cb-bd54-48b7-b54c-2ff9f4f75...@s8g2000prg.googlegroups .com >,
>
>>>> wenfang_z...@hotmail.com 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 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 of 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 = 50
>>>> x = FINDGEN(n)/(n-1)
>>>> y = FINDGEN(n)/(n-1)
>
>>>> xx = REBIN(x, n, n)
>>>> yy = REBIN(REFORM(y, 1, n), n, n)
>
>>>> u = -SIN(!PI*xx)*COS(!PI*yy)
>>>> v = COS(!PI*xx)*SIN(!PI*yy)
>
>>>> VEL, u, v, NVECS = 100, NSTEPS = 100, length = 0.5
>
>>>> END
>
>>> Following on from Ken's example, you might also try,
>
>>> iVector, u, v, x, y, /STREAMLINES, STREAMLINE_NSTEPS=25
>
>>> -Chris
>>> ITTVIS- 隐藏被引用文字 -
>
>>> - 显示引用的文字 -
>
>> 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 Corporation
> 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.
|
|
|
|
| Re: how to draw streamline [message #59304 is a reply to message #59208] |
Mon, 17 March 2008 07:27 |
Michael Galloy
Messages: 1114
Registered: April 2006
|
Senior Member |
|
|
On Mar 16, 11:22 pm, wfz...@bjmb.gov.cn wrote:
> On 3月14日, 上午4时32分, Chris Torrence <gorth...@gmail.com> wrote:
>
>> On Mar 7, 7:55 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
>
>>> In article
>>> < 92bef8cb-bd54-48b7-b54c-2ff9f4f75...@s8g2000prg.googlegroups .com >,
>
>>> wenfang_z...@hotmail.com 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 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 of 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 = 50
>>> x = FINDGEN(n)/(n-1)
>>> y = FINDGEN(n)/(n-1)
>
>>> xx = REBIN(x, n, n)
>>> yy = REBIN(REFORM(y, 1, n), n, n)
>
>>> u = -SIN(!PI*xx)*COS(!PI*yy)
>>> v = COS(!PI*xx)*SIN(!PI*yy)
>
>>> VEL, u, v, NVECS = 100, NSTEPS = 100, length = 0.5
>
>>> END
>
>> Following on from Ken's example, you might also try,
>
>> iVector, u, v, x, y, /STREAMLINES, STREAMLINE_NSTEPS=25
>
>> -Chris
>> ITTVIS- 隐藏被引用文字 -
>
>> - 显示引用的文字 -
>
> 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 Corporation
Software Developer II
|
|
|
|
| Re: how to draw streamline [message #59418 is a reply to message #59276] |
Tue, 18 March 2008 06:50 |
Michael Galloy
Messages: 1114
Registered: April 2006
|
Senior Member |
|
|
wfzhao@bjmb.gov.cn wrote:
> thanks for you response. I think OSTR and GSTR are what I need. and I
> download the source code from your web site named mg_lic.pro and run
> in IDL, but it causes my cpu 100% and my computer crash down. so may
> I use it correctly or I can adjust some parameter to decrease the
> data? for the first gird, I already do it successfully on the
> countour plot, which means to overplot wind grid arrow on the contour
> plot map.
MG_LIC is very processor intensive; it will take a few minutes at 100%
of the CPU (depending on processor speed). It is slow because it loops
through the elements of the vector field. I have a start on a DLM to do
this that hopefully would be much faster, but I just haven't had time to
finish it yet.
Mike
--
www.michaelgalloy.com
Tech-X Corporation
Software Developer II
|
|
|
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