[aprssig] Re: Balloon Altitude (was Clipped menus in Xastir andother ?'s)
k4hg at tapr.org
Mon Dec 13 10:07:31 CST 2004
On 12/13/04 at 8:33 AM Larry Cerney <lcerney at viawest.net> sent:
>Maybe you could help me with a problem with your cgi script below. We flew
>a balloon yesterday with two APRS packages on it. The first package,
>AE0SS-11 reports correctly with the last=9999 as it hadn't been seen by
>FindU until yesterday. My package, K0ANI-11, I had tested in my yard 30
>feet away from my I-gate antenna and so FindU has a good base of altitude
>data. When I use the cgi below with last=9999 it works fine. When I try to
>change it to last=24 or last=0024 I get an error message.
>"The image "http://www.findu.com/cgi-bin/altitude.cgi?call-k0ani-11&last=24"
>cannot be displayed, because it contains errors."
>I just tested a few last='s and found that it does work starting at
>last=1400. Strangely, with last=1390 it only shows the downward slope.
First the above URL is incorrect, it is call=k0ani-11, not call-k0ani-11,
however even fixing this gives an empty graph, because k0ani-11 has not sent a
position in the 24 hours. In fact, the last position was October 16. I'll leave
it for someone else to double-check the conversion to hours, but two months is
pretty close to 1400 hours...
>I'm assuming the last= refers to hours, not minutes. I that correct?
yes, but perhaps somehow you got the idea it is last hours it transmitted, not
last from the current time. All the cgis that accept a last are referenced to
current time. In fact now last=1390 fails, but 1391 gives the part of the flight
above 50k. By the time you read this, it will be different...
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