Ok, thanks for all the advice. It makes perfect sense to keep surveys separate 
rather than just adding to an older one. I do find that on some of my first 
surveys I missed detail I needed which is one of the reasons I asked this 
question but as you correctly said Andrew I can import a new xvi file. I didn't 
realise you could do this so once I work out how to position it correctly this 
should work OK. The .th I can do in a text editor. 
So the lesson learnt here is improve my technique/workflow, get a system going 
and stick to it this then should avoid having to do the above.  

Thanks again everybody,

Nick.

-----Original Message-----
From: therion-bounces at speleo.sk [mailto:therion-boun...@speleo.sk] On Behalf 
Of Andrew Atkinson
Sent: 15 July 2015 09:14
To: therion at speleo.sk
Subject: Re: [Therion] Additions To Pocket Topo Data

Nick

I have written topParser, following what I do, with a little adaptation
for other methods that I know about when people ask me.

I try to strctly follow the one survey trip, one file methodology, so
what you are trying to do is not implemented, and to be truthful it
would be very hard to do, I think.

I would suggest that organising files by surveys trip (A caving trip to
survey 2 parts of a cave counts as 2 trips, as starting a survey and
going back to the same spot) The reason that I do this is although it
looks very verbose at the start, as projects become large it actually
makes data organisation easier. Mixing data can lead to difficulties
latter, the obvious problem is that if the instrument is in different
calibration, or worse out of calibration, this might not be discovered
until later, say when a look is closed, it is easier to find and remove
these sort of things if they are grouped together. There are probably
many ways to do this sort of thing, I find this works for me.
As Bruce said joining is easy, so long as the sketches are not joined on
a junction and when you get further into the power of therion, you will
probably find that more smaller sections with joins is what you want, I
have certainly found myself having to go back and split scraps up to get
to some final outputs.

However, if you really want to amend a drawing, for things like going
back and adding more detail to an existing top file, the th2 can be
generated, this also generates an xvi file which is the underlying
drawing. This can then be imported into your th2 file, either through
the front end or in a text editor. Guess I could add an option only to
generate the xvi files, which should help and is reasonably easy. I will
add it to the todo list.
Amending an existing th file automatically is the sort of thing that
could lead to all sorts of trouble and is way beyond the simplicity of
topParser. I would say that manually doing it is the best option, best
method is probably to generate the new th file and as you say paste over
the relevant bits manually

Andrew

On 14/07/15 21:05, Bruce wrote:
> Nick
> 
> I don't know the answer to your question.  I have always created a new
> .top file for a new day or new survey segment (separated from previous
> survey legs that day).  Hence I am careful not to leave any small or
> isolated bits of passage unsurveyed, to avoid future tiny surveys!
> 
> Joining together is easy, and so it is a strength of the method that
> there is no need to wait until you have finished surveying.  Complete
> your Therion centerline and drawing at the end of each day!
> 
>  
> 
> Bruce
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *From:*therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] *On
> Behalf Of *Nick Bairstow
> *Sent:* Wednesday, 15 July 2015 6:42 a.m.
> *To:* 'List for Therion users'
> *Subject:* [Therion] Additions To Pocket Topo Data
> 
>  
> 
> Hi, If I bring Pocket Topo data/sketch into Therion with Top Parser and
> draw up the survey and then go back to the cave and add more stuff to
> the original topo file using say the continue here option is it possible
> to somehow easily get/replace the amended topo data into the original
> .th2 file and retain the scrap work already done or do I have to create
> a new survey. Obviously I can amend the .th with a text editor.
> 
> I sometimes find myself waiting to draw things up whilst I get time to
> go back to get the last bits of the survey done so everything is in one
> file and I don't have to join it all together.
> 
> Sorry if this is a bit of a stupid question but if you don't ask you
> never find out.
> 
>  
> 
> Nick Bairstow
> 
> 
> 
> _______________________________________________
> Therion mailing list
> Therion at speleo.sk
> http://mailman.speleo.sk/mailman/listinfo/therion
> 
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