OK, as I've not got anywhere with this, is there a way to ignore the coordinates in a survex 3D file, and instead fix a survey station to a point where I define the position and coordinate system in my therion file, and associate a station in my Survex 3d file with that point? The problem I have is that I am using existing survex .3d files where all the coordinates are in UTM30 European 1979 Datum. This is not the same as the more common WGS84 Datum. So I cannot set the coordinate system for my .3d file directly.

You can hopefully see what I am trying to do here:

survey LosHoyos
 
  #fix 1.0 41.234567 -3.21012 213

  import 0072.3d -surveys use #-cs EPSG:32230

endsurvey

I am importing an existing survey centreline from the .3d file. I cannot assign this a coordinate system directly as Therion does not support the coordinate system I need.
So instead I define the point 1.0 as fixed using the WGS84 Lat Long which I have. Now I want to attach the stations imported from the .3d file to the fixed point to correctly position the cave.

Footleg


On 26 March 2011 13:40, Footleg <drfootleg@gmail.com> wrote:
That appears to be the ED50 Datum. I need the EUR79 datum of everything is a few hundred metres out of position.

Footleg


On 26 March 2011 12:43, Graham Mullan <graham.mullan@coly.org.uk> wrote:
For Spain, try using EPSG 23030 for your cs

see http://spatialreference.org/ref/epsg/23030/

Graham
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On 26/03/2011 11:00, therion-request@speleo.sk wrote:
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Today's Topics:

   1. Support for UTM European 1979 Datum (Footleg)


----------------------------------------------------------------------

Message: 1
Date: Fri, 25 Mar 2011 14:13:54 +0000
From: Footleg<drfootleg@gmail.com>
Subject: [Therion] Support for UTM European 1979 Datum
To: List for Therion users<therion@speleo.sk>
Message-ID:
       <AANLkTinKkQdQt5dgdGcma_9ratem5n+WHMxn9Yw2WwOH@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

I'm making good progress now on learning how to generate various output from
Therion, and have started on generating KML plan maps for google earth. My
problem is that my survey data is coming from survex .3d files which I am
importing. I am working with data for many hundreds of caves, and they are
all fixed using UTM with the European 1979 Datum because that is the
coordinate system of the expedition area maps we have had for the past few
decades. As far as I can tell, this datum is not included in Therion at the
moment. I've checked the epsg file in the source. I specifically need the
UTM30N zone as all our caves using this coordinate system are in that zone.
Is this something which can be added please?

Footleg
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