Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
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
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
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