| Re: Streamlines with IDL? [message #2964] |
Mon, 17 October 1994 15:34  |
todd
Messages: 25
Registered: February 1994
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Junior Member |
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In article <Cxu2LL.8C4@ngdc.noaa.gov>, tmg@etl.noaa.gov (Tom Georges) writes:
|> Does anyone know where we could find an IDL program that would
|> create streamlines from a velocity field? By "streamlines", we
|> mean: continuous lines that are everywhere parallel to the
|> flow field. The "streamlines" that are mentioned in RSI's IDL
|> documentation are plots of arrows that indicate direction at
|> discrete points in the field. We are interested in *continuous*
|> lines.
|>
|> Thanks in advance for your help.
|>
|>
|> _ /| Tom Georges tmg@etl.noaa.gov
|> \'o.O' NOAA Environmental Technology Laboratory
|> =(___)= Boulder, Colorado 80303 (303) 497-6437
|> U
Since you have the two components of velocity, can't you
just calculate the stream function and then contour that?
todd
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| Re: Streamlines with IDL? [message #2975 is a reply to message #2964] |
Tue, 18 October 1994 19:06  |
hahn
Messages: 108
Registered: November 1993
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Senior Member |
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In article <CxvHF5.4n2@ngdc.noaa.gov> tmg@etl.noaa.gov (Tom Georges) writes:
> From: tmg@etl.noaa.gov (Tom Georges)
> Subject: Re: Streamlines with IDL?
> Date: Tue, 18 Oct 1994 14:25:53 GMT
.... several lines deleted ....
> Thanks for several responses to this post. I need to clarify
> what we want. We don't have the velocity field, only the direction
> field, so the streamline spacing won't indicate speed. Never-
> theless, we want lines that are everyhwere perallel to the
> gridded direction data. Thanks again.
> _ /| Tom Georges tmg@etl.noaa.gov
> \'o.O' NOAA Environmental Technology Laboratory
> =(___)= Boulder, Colorado 80303 (303) 497-6437
> U
Take a look at the procedure velovect.pro in lib/graphics (IDL 3.6.1) or
userlib (IDL 3.5). You may adapt it for your purpose.
Hope this helps,
Norbert Hahn
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| Re: Streamlines with IDL? [message #2976 is a reply to message #2964] |
Tue, 18 October 1994 07:25 |
tmg
Messages: 2
Registered: October 1994
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Junior Member |
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In article <37uu5q$cn7@news.mic.ucla.edu>, todd@artemis.ess.ucla.edu (Todd Ratcliff) says:
>
> In article <Cxu2LL.8C4@ngdc.noaa.gov>, tmg@etl.noaa.gov (Tom Georges) writes:
> |> Does anyone know where we could find an IDL program that would
> |> create streamlines from a velocity field? By "streamlines", we
> |> mean: continuous lines that are everywhere parallel to the
> |> flow field. The "streamlines" that are mentioned in RSI's IDL
> |> documentation are plots of arrows that indicate direction at
> |> discrete points in the field. We are interested in *continuous*
> |> lines.
> |>
> |> Thanks in advance for your help.
> |>
> |>
> |> _ /| Tom Georges tmg@etl.noaa.gov
> |> \'o.O' NOAA Environmental Technology Laboratory
> |> =(___)= Boulder, Colorado 80303 (303) 497-6437
> |> U
>
>
> Since you have the two components of velocity, can't you
> just calculate the stream function and then contour that?
>
> todd
Thanks for several responses to this post. I need to clarify
what we want. We don't have the velocity field, only the direction
field, so the streamline spacing won't indicate speed. Never-
theless, we want lines that are everyhwere perallel to the
gridded direction data. Thanks again.
_ /| Tom Georges tmg@etl.noaa.gov
\'o.O' NOAA Environmental Technology Laboratory
=(___)= Boulder, Colorado 80303 (303) 497-6437
U
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