plotting vectors on maps

plotting vectors on maps

Hi All.  I've been banging my head against the wall trying to get IDL to
plot vectors onto a map.  VEL, VELOVECT and their cousins work ok,
however they all require gridded data.  My data are a dozen or so more
or less randomly located geographical points with X (East) and Y (North)
velocity components.  Does anybody have/know of a simple plot routine
that accepts U,V,x,y as vectors, rather than 2-D arrays?

david

--
David Bowmman
Assistant Professor
Department of Geological Sciences
California State University, Fullerton
Fullerton, CA 92834-6850

plotting vectors on maps

> Hi All.  I've been banging my head against the wall trying to get IDL to
> plot vectors onto a map.  VEL, VELOVECT and their cousins work ok,
> however they all require gridded data.  My data are a dozen or so more
> or less randomly located geographical points with X (East) and Y (North)
> velocity components.  Does anybody have/know of a simple plot routine
> that accepts U,V,x,y as vectors, rather than 2-D arrays?

VELOVECT doesn't require gridded data. That is the whole
point of the optional X and Y vectors. These vectors
place the vectors randomly on the plot.

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.

Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

plotting vectors on maps

Hello,

The built-in ARROW procedure does just this with a looped call to
PLOTS.   The code is written to allow you to control the arrow head
size and other characteristics.

Ben

On Mon, 17 Jun 2002 08:14:07 -0700, David Bowman

>Hi All.  I've been banging my head against the wall trying to get IDL to
>plot vectors onto a map.  VEL, VELOVECT and their cousins work ok,
>however they all require gridded data.  My data are a dozen or so more
>or less randomly located geographical points with X (East) and Y (North)
>velocity components.  Does anybody have/know of a simple plot routine
>that accepts U,V,x,y as vectors, rather than 2-D arrays?

>david

>--
>David Bowmman
>Assistant Professor
>Department of Geological Sciences
>California State University, Fullerton
>Fullerton, CA 92834-6850

Hello all,

I am interested in a procedure which plots vectors or points
(specified as longitude/latitude data) on the current map projection
for IDL.  I have found velovect, but I am not sure that this is what I
want.  Also is there a good tutorial for creating maps with various
annotations in IDL?  This is a new topic for me and would appreciate