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Re: Streamlining (or textured fill topography)
"Martin Schultz" <email@example.com> wrote in message
> Robert Dahni wrote:
> > I am currently looking at IDL 's ability to automatically plot
> > from the
> > wind field (u,v components) from a meteorologist's point of view.
> > I have used the procedures PARTICLE_TRACE, PLOTS and ARROW with success
> > (IDL V5.3 on Windows).
> > Take a look at this example
> > http://www.metvis.com.au/graphics/streamline.jpg.land and seafloor
topography data sets
> > Robert Dahni
> > Meteorologist, IDL Programmer
> > Bureau of Meteorology, Melbourne, AUSTRALIA
> > firstname.lastname@example.org
> Hi Robert,
> that looks really nice. Where did you get this "background" image
> from? Is this something that's publically available? Does it cover the
> whole earth and can you zoom in at will? This looks far nicer than the
> plain IDL map background...
The background image is the result of a textured fill of a subset of GTOPO30
global topography. I have been able to "zoom in at will" in another GUI
application, by "re-calculating" the textured fill from the topography data.
Links to global coastlines, land and seafloor topography data sets can be
found at www.metvis.com.au/idl/idl_resources.html including the publically
available GTOPO30 topography. But beware, it is a large global data set and
we have had to break up the tiles into more manageble smaller ones, and
extract a region of interest at a specified resolution..
If you are interested in a sample (small) GTOPO30 topography data set, the
textured fill image (as a GIF file) and the IDL code used to produce the
image, please e-mail me (email@example.com) with the latitude and longitude
limits of your region of interest (please don't ask for near the poles?).
I've been a lurker of this valuable newsgroup for many years, and it's time
I started making a greater contribution for the benefit of this vast IDL
Meteorologist, IDL Programmer
Bureau of Meteorology, Melbourne, AUSTRALIA