[Therion] LOX: Measure distance from station to surface

[Benedikt Hallinger]

Hi there,
i released version 1.0 of therionsurface2survex 
(https://github.com/hbeni/therionsurface2survex)
and now the problem with this is, that the name is not fitting 
anymore...

Version 1.0 can:
- read GDAL ASCII grids directly [1]
- read therion "surface" blocks
- write survex .swx files containing the mesh
- write therion source files containing the mesh (flags surface) [2]


[1] i niticed that those files do not contain information about the 
coordinate-system used, so you need to add this manually afterwards. 
Question to all of you: would you expect an option that the tool adds it 
itself?
[2] would be my preferred way because it allows better control about 
further usage, also integration is more straightforward.


Am 2020-03-28 1:21, schrieb 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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>> 
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