[wxqc] Where Did This Bad Data Come From?

Thu Apr 3 14:40:35 CDT 2008

Evan, I cannot speak to the cause of the long-delayed report, but it is 
timestamped when it hits the servers.  In the case cited, T2PSR somehow 
introduced old data... or incorrectly timestamped it.  I'll discuss this 
with the various involved folk in the server world.  The raw packet data 
  as seen on FindU display the data added by the server... in this case 
T2PSR.

Regardless of when your console might timestamp a packet, the system is 
going to relabel it with a time-received-on-the-server timestamp.  This 
is a protocol legacy issue.

ON another issue though:  WX2CHS is an Amateur Radio station.  If you 
want it to be seen on local tactical displays, please make sure you're 
using either rotate.aprs.net or rotate.aprs2.net.  If you do not want it 
available to the ham community for tactical display then using 
cwop.aprs.net is appropriate.

Switching between the two types of rotate DNS entry-sets will result in 
schizophrenia with regard to local Amateur Radio tactical displays... 
but will not adversely affect (we believe) CWOP's pickup of the data. 
The gotcha is when we see something like this.

gerry

Evan Bookbinder wrote:
> Noticed a recent spike in my graphs on FindU that does not show up locally
> 
> Station: WX2CHS (AP536)...
>  
> It's a steady light rain and stagnant temp, so this anomoly was obvious:
>  
> Note the 20080403171815 observation
>  
> 20080403173055  46  65  2.0  4.0 0.03 0.16 0.16 92 1010.7
> 20080403172622  46  80  0.0  2.0 0.05 0.16 0.16 92 1010.9
> 20080403172133  46  75  1.0  3.0 0.05 0.15 0.15 92 1011.0
> 20080403171815  48  158  1.0  4.0 0.00 0.00 0.00 69 1016.8
> 20080403171559  46  34  1.0  3.0 0.06 0.15 0.15 92 1011.0
> 20080403171102  46  61  0.0  4.0 0.06 0.15 0.15 92 1011.0
> 20080403170606  46  40  1.0  4.0 0.06 0.15 0.15 92 1011.5
> 20080403170103  46  79  0.0  3.0 0.07 0.15 0.15 92 1011.2
> 20080403165626  46  96  2.0  4.0 0.07 0.15 0.15 92 1010.9
> 20080403165107  46  92  2.0  4.0 0.07 0.15 0.15 92 1011.1
> 20080403164605  46  107  1.0  4.0 0.07 0.15 0.15 92 1011.5
> 20080403164137  46  96  1.0  3.0 0.07 0.15 0.15 92 1011.6
> 20080403163635  46  108  1.0  4.0 0.06 0.14 0.14 92 1011.9
> 20080403163121  46  111  1.0  4.0 0.06 0.14 0.14 92 1011.5
> Now, when I view the raw data:
>  
> WX2CHS>APRS,TCPXX*,qAX,T2PSR:@031646z3854.60N/09419.45W_107/001g004t046r007P015p015h92b10115VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,T2PSR:@031651z3854.60N/09419.45W_092/002g004t046r007P015p015h92b10111VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,CWOP-3:@031656z3854.60N/09419.45W_096/002g004t046r007P015p015h92b10109VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,CWOP-3:@031701z3854.60N/09419.45W_079/000g003t046r007P015p015h92b10112VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,CWOP-1:@031706z3854.60N/09419.45W_040/001g004t046r006P015p015h92b10115VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,CWOP-1:@031711z3854.60N/09419.45W_061/000g004t046r006P015p015h92b10110VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,T2PSR:@031716z3854.60N/09419.45W_034/001g003t046r006P015p015h92b10110VL1112
> WX2CHS>APRS,TCPXX*,qAX,T2PSR:@030830z3854.60N/09419.45W_158/001g004t048r000P000p000h69b10168VL1112
> WX2CHS>APRS,TCPXX*,qAX,CWOP-1:@031721z3854.60N/09419.45W_075/001g003t046r005P015p015h92b10110VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,CWOP-3:@031726z3854.60N/09419.45W_080/000g002t046r005P016p016h92b10109VL1112 
> 
> WX2CHS>APRS,TCPXX*,qAX,CWOP-2:@031731z3854.60N/09419.45W_065/002g004t046r003P016p016h92b10107VL1112 
> 
>  
> Note the 4th from the bottom, there's an observation from 030830z.
>  
> Where did that come from? Why does the graph and weather data link think 
> it's from 031718Z instead of the time included in the observation? Can 
> someone please purchase this from the system?
>  
> Evan
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> wxqc mailing list
> Post messages to wxqc at lists.gladstonefamily.net
> To unsubcribe or change delivery options, please go to:
> http://server.gladstonefamily.net/mailman/listinfo/wxqc
> To search the archives: http://www.google.com/coop/cse?cx=008314629403309390388%3Aknlfnptih9u
> 
> The contents of this message are the responsibility of the author.

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.862.3982 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843