[Therion] mixing local and global coordinate systems

[Jonny Prouty]

Hello Bruce,

Thanks for the suggestions! I'll go have a more thorough look through the
therion book. The calibrate command looks particularly promising!

Jonny

On Fri, Aug 3, 2012 at 3:56 PM, Bruce <bruce at tomo.co.nz> wrote:

> **
>
> Hi Jonny****
>
> No real answer, but you can equate two fixed stations, but you will need
> to specify error values for one or both of them.  I have done it before
> with coordinates in the same cs.  It should work for differing cs (I have
> done this in different circumstances), but of course not for an arbitrary
> coordinate system.  There are some interesting hacks needed in some
> circumstances, see
> http://article.gmane.org/gmane.comp.gis.therion/2909/match=loop+fix****
>
> Stacho indicated he would look at correcting some of the issues raised,
> perhaps why the next update is taking so long J****
>
> ** **
>
> From the therion book…****
>
> ** **
>
> fix <station> [<x> <y> <z> [<std x> <std y> <std z>]] ◃ fix station
> coordinates (with specified errors—only the units transformation, not
> calibration, is applied to them).****
>
> ** **
>
> And on transforming the plt coordinates, the calibrate option of the
> import command on page 33 of The Therion Book seems to suggest a way
> forward.  I have never used ‘import’ so cannot speak from experience.****
>
> ** **
>
> Bruce****
>
> ** **
>  ------------------------------
>
> *From:* therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] *On
> Behalf Of *Jonny Prouty
> *Sent:* Saturday, 4 August 2012 6:21 a.m.
> *To:* **List for Therion users**
> *Subject:* [Therion] mixing local and global coordinate systems****
>
> ** **
>
> 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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