[GRASS-user] r.profile

[Mark Seibel]

Thanks.  I'll have to come up with a creative solution.  The best solution
would have been for the US to adopt the metric system back in the 70s, but
there's some saying about spilt milk.


Mark


On Wed, Jul 2, 2014 at 1:07 PM, <sedwards2 at cinci.rr.com> wrote:

>
> ---- Mark Seibel <mseibel at gmail.com> wrote:
> > When using r.profile interactively in a location using horizontal and
> > vertical units of meters, the output profile is correct.  My transect is
> > about 800 meters long.
> >
> > When using r.profile interactively in a location using horizontal and
> > vertical units of feet, the Y axis (raster elevation values) displays
> > values correctly.  However, the X axis stops plotting at 800 *feet* but
> > puts the endpoint 'triangle' of the profile at the correct distance on
> the
> > X axis at around 2600 feet.   Essentially, it squishes the plot to fit
> > between 0 and 800 when it should be between 0 and around 2600.
> >
> > I notice that when I measure distances, the display also outputs the
> units
> > in meters, but the values are in feet.  Seems like a related issue.
> >
> > Where do I change this so that units are correct as feet?  I've tried
> > setting the EPSG code in Settings-->Preferences-->Projection Tab to 2882
> > with the proj.4 string inserted, but it still treats the horizontal units
> > as if they were meters and not feet when measuring or profiling the
> surface.
> >
> > Tried r.profile in GRASS 6.4 and 7.1 on Linux Mint with same results.
> >
> > Thanks,
> > Mark
>
> This is a long standing problem (for me anyway) - see thread from 2012
> https://www.mail-archive.com/grass-dev@lists.osgeo.org/msg26480.html
> I still have the problem but have learned to adapt … I upgrade the csv
> output to the appropriate scales in GNU Octave and replot… bit of a pain
> but it works.
> Interesting that you are experiencing this on a Linux system - others
> reported the problem not replicated on Linux back in 2012.
>
> Stu
>
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