If you used one layer for each time slice, and you set the filter for that 
layer dynamically, you might be able to do something like this.  

For example, you could have three layers, 'current', 'older', and 'old'.  If 
you passed in the filter expression for 'current', you would set it to the 
latest data.  You would do the same with the other two layers, setting them to 
the older data sets.  

You could then symbolize the older and old layers using transparency or color 
(fading from color to grey?) to make them appear as though they are fading 
away.  

David.

-----Original Message-----
From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On Behalf Of Marcos 
Sánchez Provencio
Sent: Monday, October 15, 2007 8:25 AM
To: [email protected]
Subject: [UMN_MAPSERVER-USERS] Time series persistence


Hello there.

Is it possible to emulate persistence in a time series? I am showing rays 
hourly, it would be nice to let the older rays fade away slowly (like a radar 
ping).

I am using mapbuilder as the client.

Thank you in advance for the ideas.

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