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Re: gpsprof: higher resolution

From: John Ackermann N8UR
Subject: Re: gpsprof: higher resolution
Date: Sun, 16 Aug 2020 19:03:42 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0

Thanks for the info, Gary. The problem isn't the processing or display precision, it's (I think) that the autoscaling is failing to act reasonably when the range is very small. As you note, the result might not actually be "wrong" given the few pixels that 9 places of precision may span, but it doesn't look so good. :-)

The version I'm using for this particular task is whatever is distributed with Linux Mint -- I know it's old, but I don't normally use this machine for GPS tasks so never did a local build. If the newer version is likely to behave differently, I can certainly arrange to use it.


On 8/16/20 5:39 PM, Gary E. Miller wrote:
Yo John!

BTW, what version of gpsprof are you suing?  That looks pretty old?

On Sun, 16 Aug 2020 10:16:15 -0400
John Ackermann N8UR <> wrote:

But the gpsprof plot isn't very useful; see attached. I'm guessing
that I'm running up against some limit that prevents getting a proper
scale for the very small values.

Odd as it seems, looks right to me.  Using %.9f lat/lon, and your data is
only +/- a few mm, that is only a few dots high.

gnuplot makes the simple trivial, and the slightly more difficult a real

The way to play with this is to hand edit the acii plot file until you
get what you want.  Then figure out how to modify the code, or jsut send
what works to me and I can do that.

Notice on line 600, that autoscale is set:
         fmt += ('set autoscale\n'

Sometimes that is easy to change, usually it becomes a large mess.

Maybe try:
         set autoscale x
         set yrange YYY

You can easily lose a few days down that rabbit hole.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
     "If you can't measure it, you can't improve it." - Lord Kelvin

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