[Xastir] Geo Files

[Lee Bengston]

Well, duh!  I should have realized by the lat/lon values what corners were
the tie points.

Thanks,
Lee

On Mon, Dec 14, 2015 at 9:32 PM, Tom Russo <russo at bogodyn.org> wrote:

> On Mon, Dec 14, 2015 at 09:08:07PM -0500, we recorded a bogon-computron
> collision of the <lee.bengston at gmail.com> flavor, containing:
> > I'm looking at a sample geo file for a map in the UK that's in JPG
> format.
> >
> > FILENAME     1liv-man.jpg
> > #             x       y        lon           lat
> > TIEPOINT       0      0      -3.51500       53.68800
> > TIEPOINT     1740    875     -1.61100       53.11700
> > IMAGESIZE    1740    875
> > REFRESH      250
> >
> > What is the refresh parameter?
> >
> > I've never actually tried making a geo for a basic map like a PNG or JPG.
> > Just to be sure, is it safe to assume tiepoint x,y=0,0 is the lower left
> > and (given the image size), 1749,875 is the upper right?
>
> Actually, 0,0 is the upper left, 1740,875 is the lower right.
>
> That's coz in the file, the upper left is the first pixel stored, and the
> lower right is the last.
>
> REFRESH is supposed to be for dynamic images, and is the time in seconds
> between
> redraws of the image.  Thing radar imagery, etc., that gets downloaded
> often,
> and needs to be redrawn.
>
> It does not make sense to have this non-zero for a static file.
>
> --
> Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
> Tijeras, NM  QRPL#1592 K2#398  SOC#236
> http://kevan.org/brain.cgi?DDTNM
>  echo "prpv_a'rfg_cnf_har_cvcr" | sed -e 's/_/ /g' | tr [a-m][n-z]
> [n-z][a-m]
>
>
>
>
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