[Therion] LOX: Measure distance from station to surface

[Benedikt Hallinger]

Thanks, but i'm not into python :)


Am 2020-03-28 1:18, schrieb Philippe Vernant:
> Hi,
> 
> There is an easy way to extract coordinates from the therion sql
> export. Then using a shell script and GMT could provide the depth of
> each point below the surface. I know that there is now a GMT library
> under Python, if they have implemented the function in the library,
> everything could be wrapped up in a single python script.
> 
> Cheers,
> Phil
> 
> 
>> On 28 Mar 2020, at 00:28, Benedikt Hallinger <beni at hallinger.org> 
>> wrote:
>> 
>> cavern had eaten itself, but after pushing ctrl-c in the shell running 
>> therion, the 3d  file was written successfully and the output was 
>> nice.
>> 
>> I enhanced the therion wiki a little with a link to the tool.
>> 
>> Sorry, i have no clue how to cross compile this for windows.
>> 
>> 
>> Am 2020-03-27 23:51, schrieb Benedikt Hallinger:
>>> Hi there,
>>> i just wrote a small tool to do the conversion from a therion surface
>>> mesh into survex format:
>>> https://github.com/hbeni/therionsurface2survex
>>> It would be nice if some C++ programmers can look over the code as
>>> this is my first c++ endeavour.
>>> The program basically parses the therion source file and generates
>>> *fix commands out of it together with nosurvey-centerline connecting
>>> the stations to a mesh.
>>> The resulting .swx file then can be put trough survex' cavern program
>>> to generate a 3d file of the mesh.
>>> That can be easily combined with a 3d file of the cave generated from
>>> therion (using the import statements). For ease of use provided a
>>> basic example for combining in the readme. A sample to parse a mesh 
>>> is
>>> in the projects example/ folder, however i also tested it positive
>>> with the rabbit cave example.
>>> With my dataset the calculation seems to take a little longer....
>>> there are 388.800 fixe stations in the surface mesh giving a 31M
>>> swx-file in total.
>>> I hope this will finish somtime (running already for 25 minutes) but
>>> maybe i overloaded cavern with this.
>>> Otherwise i probably need to turn down the grid resolution (currently
>>> 10m grid size).
>>> Am 2020-03-26 23:23, schrieb Tarquin Wilton-Jones:
>>>>> However, my aven does not enable me to avtivate it in the view 
>>>>> menu, its
>>>>> disabled (greyed out), i assume because i do not have surface data 
>>>>> in
>>>>> the file?
>>>> Sounds like it. It works based on legs that have:
>>>> flags surface
>>>> 1 2 9.8 123 0
>>>> flags not surface
>>>> Or if you have used TerrainTool to export it as a grid, it will have
>>>> added that for you.
>>>> This has been very easy for us in our projects because we either 
>>>> knew
>>>> exactly which line to follow on the surface beforehand, or we 
>>>> surveyed
>>>> the cave first then surveyed over the surface afterwards, staying 
>>>> above
>>>> the passage so we could have a useful measure of the surface above 
>>>> the cave.
>>>> In more complex caves, I rely on TerrainTool to cover the surface.
>>>> Looking forward to being able to use the new more accurate NASADEM 
>>>> so
>>>> that the measurements are actually accurate.
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