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Matt, Thanks for sending the rain rate picture. Great to hear you fixed the equation for z-R relation from Level II data. Can you send me the correct version? I hope to start an archive of example IDV Jython methods online here. Stu Wier >Subject: RE: 20030924:IDV Question Z-R relationship >Organization: UCAR/Unidata >Keywords: 200310032021.h93KL9k1024969 This is the preamble of a multipart MIME formatted message. If you are reading this text your mail system is most likely not capable of properly decoding MIME messages. To extract the contents of this message, save it to a file and then use an external MIME decoding utility. --mime-boundary-interchange-3f7f5bf7 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Mr. Wier, It turns out the equation(Z to R) given to me did work correctly. If reflectivity is over 50 or so, the error in the calculation explodes. After recognizing the problem, I was able to deal with it. So to sum it up, you can apply the rain rate equation to level II data. Thanks for all help I've attached an example Matt Jacobs -- **************************************************************************** Unidata User Support UCAR Unidata Program 303 497 8643 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata WWW Service http://my.unidata.ucar.edu/content/support ****************************************************************************