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@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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