Except that these survex files (of which there are a great many) are not managed by me. So I can't just rearrange the way they work to suit my needs. I am looking for a way to work on the data in Therion without having to force changes on the project. All the data is based on this datum because it goes back 30+ years and the detailed maps for the area are all plotted on this old grid datum. So this is the coordinate system the data is fixed with. I am just looking for a way to position my caves in KML export and Therion does not currently support the datum for the coordinate system we are using as far as I can tell.

Footleg

On 5 April 2011 15:13, Wookey <wookey@wookware.org> wrote:
+++ Footleg [2011-04-05 14:03 +0100]:

> 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.

Can't you do that fix in survex so that the numbers right to start
with? OK that might be different from your normal processing, but if
your data layout is sensible you'll have all the fixed points farmed
out into a file which can simply be replaced for the 'therion' version.

Not very pretty, I know, but it might do the trick until your desired
co-ord system becomes supported.

Wookey
--
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