>From: Don Murray <address@hidden> >Organization: UCAR/Unidata >Keywords: 200303261808.h2QI8OB2008066 McIDAS ADDE RTNEXRAD Don, >I'm trying to retrieve data in calibrated units from the >ADDE servers. For the most part, the basics are working. >In answer to my previous question about calibration units, >these are stored in word 58 (with scale in 59) if AUX=YES >is included in the ADDE request. I also updated the IMGLIST lists for FORM=AUX to list out the mapping between raw and calibrated values. These mods are being reviewed at SSEC for the v2003 release, so now is the time to make modifications if/when needed. You can see the effect from the additions by running the following from McIDAS: DATALOC ADD RTNEXRAD adde.ucar.edu IMGLIST RTNEXRAD/N1P ID=FTG FORM=AUX >I'm running into a problem with the precip products. If >I access a 1 hour precip product as brightness, I might >get a region with some echos showing a region of precip. >If I use Alt-D to query the value, it shows as 0.00 inches. >In GEMPAK, this region is shown as > 0.0 on the scale. This is for a trace amount. At the time I originally did the server, I did not want to have to return back non-byte values for the values. Later, I realized that this was needed, but I never went back and addressed the 'trace' precip amount values. >If I request the data with calibration of "RAIN" which >has units of IN and scale of 100, this region of echos >comes back with values of 0, so they are indistiguishable >from the no data regions. They probably should be 0.01 IN (a trace). >Is it possible to say that this value is 0.01 or some other >quantifier instead of sending back 0 so that it is distiguishable >from no data? I will put this on my list of things to look at in the coming week. Tom Unidata WWW Service http://my.unidata.ucar.edu/content/support
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