Re: [visad] Hovmoller diagram

Hi Tom-

Thanks for the tip. At a first pass, I'm just looking at how to map the image data, so I'm not too concerned with the map lines at this point. It is more of a general question about how to do hovmollers and I think you've both given me a nudge in the right direction.



On 10/27/10 11:10 AM, Tom Rink wrote:
Trickier part might be using YAxisOffset with the map boundaries, the ugly
way: lon,lat -> elem,line and duplicate those at each index in the field
that Bill suggested.

Don Murray wrote:
Thanks, Bill. I had tried using YAxisOffset and it sort of works, but
I think I was missing computing the scale and offset. Since I haven't
used the offset spatial scalarmaps before, I guess I'll have to bone
up on the caveats.

At least I'm on the right track!


On 10/27/10 10:45 AM, hiding@xxxxxxxxx wrote:
Hi Don,

If the images are at evenly spaced time intervals
you may simply be able to replace:

Time -> Animation


Time -> YAxisOffset

with appropriately computed scale and offset. If
the time intervals are not evenly spaced, then you
may need to convert your data to something like:

(Index -> (Time, ((ImageElement, ImageLine) -> Band1)))

and replace:

Time -> Animation


Index -> YAxisOffset

It will be a little work to compute proper scale
and offset for the ScalarMap to YAxsOffset.

Good luck and let us know if you have any problems.


-----Original Message-----
From: Don Murray <Don.Murray@xxxxxxxx>
To: visad@xxxxxxxxxxxxxxxx
Sent: Wed, Oct 27, 2010 10:53 am
Subject: [visad] Hovmoller diagram

Hi All-

I have a set of images that show the data of a narrow band of the earth.
The MathType is:

(Time-> ((ImageElement, ImageLine) -> Band1))

with a CoordinateSystem of:

(ImageElement, ImageLine) ==> (Latitude, Longitude)

Normally, I map:

Latitude->Y Axis
Longitude -> X Axis
Band1 -> RGB
Time -> Animation

to do a time animation of the images. What I would like to do is
generate a Hovmoller diagram where Time is the Y axis and the images are
stacked along in time, such as the image here:

What ScalarMaps would I need and/or how would I need to munge the data
to accomplish this?

Thanks for your help.

Don Murray

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