[Therion] mixing local and global coordinate systems

[Jonny Prouty]

Hello again Bruce and Andrew,

Your suggestion of using the calibrate option with the import command did
the trick! The origin of the coordinate reference system in the PLT file
was set to one of the entrances. My calibrate command set 0 0 0 in the
input to the northing, easting, and elevation for that point, i.e. import
test.plt -calibrate [0 0 0 363315 3837128 368]. I am now able to use the
survey with the surface I've created for that area and have it tie in with
my survey.

I've commented out all of the "cs" commands in the project, as I haven't
fiddled with setting the error values for one of the stations, as suggested
by Bruce. Exported maps will at least have the correct X and Y pairs, I'll
simply have to go in after the fact and specify the specific reference
system. Thanks again for the all of the help.

Jonny

On Fri, Aug 3, 2012 at 3:39 PM, Andrew Atkinson <andrew at wotcc.org.uk> wrote:

> I have not tried this with plt but with 3d, however according to the
> thbook it should work.
>
> import file.plt calibrate [<x> <y> <z> <X> <Y> <Z>]
>
> Where coordinates in the imported file are shifted
> from lower-case coordinates to upper-case coordinates.
>
> I hope I have understood what you are trying to achieve, if not a sample
> file might help
>
> Andrew
>
> On 03/08/12 19:20, Jonny Prouty wrote:
> > Hello all,
> >
> > I have a compass PLT file that I would like to import into an existing
> > therion project that I have. The therion project has numerous fixed
> > stations, all in the same UTM zone. Unfortunately, if I try to equate a
> > station in the PLT file with the equivalent station in my project, I
> can't
> > proceed as I can't mix local (in the PLT file) and global (in my project)
> > coordinate systems. If I comment out all of the "cs" commands in my
> therion
> > project as a test, I can't proceed because therion won't allow two fixed
> > stations to be equated with one another. Removing the "cs" commands isn't
> > really a viable option anyways since I need the stations to have
> real-world
> > coordinates so that I can load the maps into QGIS and GRASS.
> >
> > My question then is is it possible to override the coordinates of an
> > imported PLT file, transforming them into the coordinate system of my
> > project? Thanks very much in advance!
> >
> > Best regards,
> >
> > Jonny
> >
> >
> >
> >
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