[Therion] Combining caves using different co-ordinate systems

Sat Sep 20 12:14:53 CEST 2014

Could it be that it comes from cs specifications in the same centerline 
environment?

I have been using multiple datums (e.g lat-long, UTM, old and new 
lambert coordinate systems for France) for fixing coordinates in a 
system of multiple caves without any problem. However, I believe that I 
have a single cs statement per centerline.  Indeed, at some point I 
discovered that the equal statements were now working properly outside 
the centerline environment, so that I centerlined individually all my 
pieces of survey, even in the same survey.

My 2 bits

Xavier

Le 19/09/2014 23:10, Bruce a écrit :
> We have been using multiple coordinate systems for a number of years, 
> and it seems to work perfectly.
> We mix and match at will between lat-long, NZMG and NZTM (ie old and 
> new datums) within the same cave survey and between cave surveys.
> So, Footleg, unless you have other reasons to do so, there is no need 
> to convert your old datum coords to new datum coords.
> There seem to be a couple of rules to keep things working smoothly.  
> Have a look at Therion Book pg 14 and 46-47 and keep in mind 
> the distinction between input and output.
>
> 1.
>     Each centerline with fix statement(s) should have a date and cs
>     specification (prior to the fix I think).
> 2.
>     So that you can be sure of the cs applied to the outputs, specify
>     the output cs that you want in the th-config (not in a layout).
> 3.
>     I have avoided using cs in layout, as, even if Therion is
>     consistent in the way it applies it, in the situation where there
>     are multiple coordinate systems in use, it is not abundantly clear
>     to a user which cs will be used, for example where
>     some centrelines have no explicit cs or for the output.  (Although
>     reading Therion Book pg 47, maybe that is for Atlas outputs - been
>     a while, I forget).
>
> Now that we have output variables in 5.3.15 that echo the cs that has 
> been used for output, it will be possible to have this stamped in the 
> pdf header.  I have a 'proof that it works' layout drafted up, and one 
> day I will make a modular set of layouts to make it readily useable
> The first file embedded on this page 
> http://therion.speleo.sk/wiki/doku.php/templates
> (ie 
> http://therion.speleo.sk/wiki/lib/exe/fetch.php/templates:thconfig-templatesimple.txt)
> shows how I use it in a th-config file.
> Bruce
>
> ------------------------------------------------------------------------
> *From:* therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] 
> *On Behalf Of *Footleg
> *Sent:* Saturday, 20 September 2014 4:13 a.m.
> *To:* List for Therion users
> *Subject:* Re: [Therion] Combining caves using different co-ordinate 
> systems
>
> I had put one cave using a cs and gps fix coordinates into one survey 
> block in a .th file. Then a second cave using a different cs and gps 
> fix coordinates in a second .th file.
>
> My project then uses a master.th <http://master.th> file which inputs 
> both of these. If I run my config on either of the individual files 
> then they appear at the correct place on Google Earth from an output 
> kml file. If I include both caves then they appear in different 
> places. The one I include first is in the correct place. If I swap the 
> order they appear in the master.th <http://master.th> file then this 
> confirms the first one is alway put in the correct place, and the 
> second is positioned using the cs of the first one.
>
> The same in a lox model file (except I cannot confirm which is 
> correct, but I see them in different places when I give them the same 
> entrance location to test this).
>
> Footleg
>
> On 19 Sep 2014 14:33, "Andrew Atkinson" <andrew at wotcc.org.uk 
> <mailto:andrew at wotcc.org.uk>> wrote:
>
>     You can use cs in config file, either inside layout, or outside
>     layout (most likely what you want to do) to control the output
>     co-ordinate system, which I think is what you are trying to do?
>
>     Andrew
>
>     On 19 Sep 2014 14:00, "Footleg" <drfootleg at gmail.com
>     <mailto:drfootleg at gmail.com>> wrote:
>
>         I have been converting a project from an old datum to a more
>         recent
>         one following the issuing of new maps using the newer datum.
>         So all my
>         entrance GPS coordinates changed. I updated the cs statements
>         in my
>         survey data files and my KML output is still in the correct
>         place. So
>         all was looking good. Then I discovered that if I include a
>         survey in
>         the old cs with one using the new cs then Therion appears to treat
>         both caves as having the same cs. Whichever cs is used by the
>         first
>         included cave is applied to subsequent caves too. Is there a
>         way to
>         deal with this?
>
>         Footleg
>         _______________________________________________
>         Therion mailing list
>         Therion at speleo.sk <mailto:Therion at speleo.sk>
>         http://mailman.speleo.sk/mailman/listinfo/therion
>
>
>     _______________________________________________
>     Therion mailing list
>     Therion at speleo.sk <mailto:Therion at speleo.sk>
>     http://mailman.speleo.sk/mailman/listinfo/therion
>
>
>
> _______________________________________________
> Therion mailing list
> Therion at speleo.sk
> http://mailman.speleo.sk/mailman/listinfo/therion

-- 
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
> 2004 Route des Lucioles, BP93
> F-06902 Sophia-Antipolis Cedex, France
> +33 4 92 38 76 64
> +33 6 78 35 16 90
> http://www-sop.inria.fr/asclepios/
> -------------------------------

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20140920/4f6f1675/attachment.htm>