Re: display a surface

• To: Ilan Bar-On <baron@xxxxxxxxxxxxxxxxx>
• Subject: Re: display a surface
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Tue, 05 Sep 2000 06:23:01 -0500

Hi Ilan,

> How do you display a two dimensional surface, like in Matlab, using the
> SpreadSheet ?

It depends on the data.  If you import the images.nc file
(from ftp://www.ssec.wisc.edu/pub/visad-2.0/images.nc) and
select Cell/Edit Mappings, you'll see the MathType:

  (Time -> ((x, y) -> val)

This indicates that images.nc contains a time sequence
of images.

Click on "Clear All", then:

1. click "x" then "X" (to map x -> XAxis)
2. click "y" then "Y" (to map y -> YAxis)
3. click "val" then "Z" (to map val -> ZAxis)
4. click "Time" then "Anim" (to map Time -> Animation)

This will create an animated 2-D surface.

If you import a GIF or JPEG image and select Edit Mappings,
you'll see the MathType:

  (ImageElement, ImageLine) -> (Red, Green, Blue))

You can see a surface with the mappings:

  ImageElement -> XAxis
  ImageLIne -> YAxis
  Red -> ZAxis
  Red -> Red
  Green -> Green
  Blue -> Blue

The basic idea is that if the data's MathType contains any
part like: (...(x, y) -> (...z...)) then you can get a 2-D
surface with mappings:

  x -> XAxis
  y -> YAxis
  z -> ZAxis

Good luck,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

• References:
  • display a surface
    • From: Ilan Bar-On