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@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of Jonny Prouty
Sent: Saturday, 4 August 2012 6:21
a.m.
To:
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