[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[GEMPAK #KTU-213331]: Radar NTP/BRET threshold values

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [GEMPAK #KTU-213331]: Radar NTP/BRET threshold values
  • Date: Mon, 24 Jun 2013 15:17:22 -0600
Hello James,

If you are referring to the Unidata-created NTP composite, which is on the 
FNEXRAD IDD feed, you should know that we apply our own color mapping table to 
this product (the upc_ntp.tbl file you mentioned).  This is done because the 
site NTP products do not have a static mapping of value-to-precipitation, but 
are scaled (or calibrated) dynamically.  For example, the current (June 24 
mid-day) NTP product from DMX (Des Moines) has a maximum value of 15 inches 
while products from DVN (Davenport) have a maximum value of 10 inches.  

Michael James
Unidata


> Hello,
> 
> I can find the list of colors used for the NTP composite in the
> upc_ntp.tbl file, but what I'm really interested in is a table or some
> kind of reference that assigns the colors to the various precipitation
> amounts (e.g. 1 inch, 2 inch, etc.) or at least how the values in BRET
> files correspond to these precipitation amounts. I've searched extensively
> through the archives and all I find is reference to the upc_ntp.tbl file
> which looks to me like a color palette and I'm assuming that there must
> be something else that assigns what I think are pseudo-brightness values
> to specific colors based on certain precipitation amounts. I don't need to
> know how to create one, I just want to see something like a table. Thanks.
> 
> Jim
> ******************************************************************************
> James P. Koermer
> Professor Emeritus, Meteorology
> Plymouth State University
> 409 Seaport Blvd.
> Cape Canaveral, FL 32920
> 
> Work Phone: (321)861-7938 E-Mail: address@hidden
> Cell: (321)205-7609
> ******************************************************************************
> 
> 
> 

Ticket Details
===================
Ticket ID: KTU-213331
Department: Support GEMPAK
Priority: Normal
Status: Open