These tools are independent of the particular data set. I had provide some small, low-resolution data sets to be used with them. Over the years, I have used them with other data sets, including much higher-resolution ones.
If you are going to reproject the grid on which the vector field is defined to calculate trajectories, you may also have to transform the vector too. The vector components (e.g., [u,v,w]) may be defined in cartesian coordinates, which would no longer be appropriate, if the grid is reprojected to spherical, for example. (Sharon, thanks for the nice comments.) Sharon Gibson <[EMAIL PROTECTED]>@opendx.watson.ibm.com on 01/09/2002 11:11:22 AM Please respond to [email protected] Sent by: [EMAIL PROTECTED] To: [email protected] cc: Subject: Re: [opendx-users] Trajectories About the map of Europe, I would recomend utilizing a global map (I use the WorldMap macro, although there are "better" or higher-resolution maps out there, I think) and then to display the image, set a Camera to zoom in on the area of interest (where the trajectory data resides). To make the map and the data look as if they are on a "globe", use the Sphere macro to transform and warp the longitude-latitude positions. If you decide to go this route, check back once you get going since there may be one or two details of this that I'm not mentioning now. Especially for the spherical projection, since you may want to provide shading to make the globe look 3-d, and/or not zoom in completely on the trajectory, but rather display the entire globe, and simply have the correct region of the globe "facing" the viewer. I use a wonderful piece of code called GeoCamera that I grabbed from the DX website (the IBM one, I think - I know that it can be credited to Lloyd Treinish), but that macro may not be necessary for your case. Good luck, Sharon
