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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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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.
Thanks! Don 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 structure 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! Don 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 with: 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 with: 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. Bill -----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: http://www.nhc.noaa.gov/gifs/gehov2.gif What ScalarMaps would I need and/or how would I need to munge the data to accomplish this? Thanks for your help. Don -- Don Murray NOAA/ESRL/PSD and CIRES 303-497-3596 http://www.esrl.noaa.gov/psd/people/don.murray/ _______________________________________________ visad mailing list visad@xxxxxxxxxxxxxxxx For list information, to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
-- Don Murray NOAA/ESRL/PSD and CIRES 303-497-3596 http://www.esrl.noaa.gov/psd/people/don.murray/
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