February 2021 - Therion

Re: [Therion] Point altitude/deph, Help !
by Xavier Robert 28 Jun '22

28 Jun '22

Hi all, I think I have found a trick. The other Xavier led me to the right tracks, thanks a lot ! Finally, this is quite simple with the point altitude, and no need to change anything inside the : - If we use the point altitude only with the option -align, we get the altitude - If we use the point altitude with the options -align and -value [-1004 m] where 1004 is the altitude of the main entrance, we print the depth only for that point (Do not forget the " - " before the altitude of the main entrance), and thus, we do not erase the classic point altitude. The only (small) limits are : * If the main entrance changes, we need to manually update ALL the points that print the depth. But that should not be be everyday, and not a big issue to do that. * the symbology of the two points is the same. I will have a look for a way to modify that and let you know if I find a trick (If I copy the code of the point Altitude, and call it p_u_depth(expr pos, R, S, A), it crashes...). Cheers, Xav

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How to calculate the volume of a cave
by Bill Gee 31 Jan '22

31 Jan '22

Hello everyone - What tools can be used to calculate the volume of a cave based on center line and LRUD data? I found an email from Martin Sluka from about 4 years ago describing how to use Loch to export a .lox file in other formats, then run that file through CloudCompare or ParaView. The process looks very complex to me, and besides - Loch does not run on my computers, so there is no way for me to generate an export. As far as I can tell, Survex does not have a way to calculate volume. Could it be done with a KML file and Google Earth? -- Bill Gee

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Strange Therion/survex disparity in altitudes
by A Gott 17 Mar '21

17 Mar '21

HI Therion friends, I'm working on a dataset with a friend, We have survex and Therion working independently, but putting the aven models [.3d] from the survex dataset and the therion dataset side-by-side we're coming out with differences. We nailed the x/y difference down somewhat with the magnetic corrections in the .th file due to dates. But we're now left with a difference in the height/altitude between the two models. The cave is a single entrance cave which is higher at the end (with a streamway 260-340m below), All of the differences are weird but the weirdest difference in altitude is in the middle, where there's a 60m difference in the survex/therion models, however further on at stream level, there is only a 20m difference [665 - 685] ##### The models are kept at: Survex: http://cave-registry.org.uk/svn/Andara/Tresviso/ Therion: http://cave-registry.org.uk/svn/Andara/Tresviso/Nacimiento/therion/Nacimien… run therion using Nacimiento2020_master.thconfig ##### I sent the following message to my friend to describe the issue: # "Hmm, I think the next thing to try and crack is the elevations. as I think there’s something going awry there, which might point us further towards the remaining 50m in n-s separation. On the .3d file generated from therion I get the following Entrance= 470m Dr2000stream_pina.23038= 665.30m Terror_firma.6= 933.34m On survex model I get: Entrance= 480m Dr2000_streamway2.23038= 685.26 Terror_firma2.6= 1025.53 I really can’t answer the 10m diff at entrance, the 20m difference at stream level or 92m difference at the top. Extrapolating down, Jurassic highway.0 is still 90m separation. However, satan_dr2000.1202 is 41m separation (higher in survex). Increases again to 66m sep at garden Eden.16 vs consort_climax.16E" If anyone can give me some help I would be thankful, as i'm confused! Regards, Alastair Gott.

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"\legendbox" "\loadpicture" and absolute paths
by rowena 14 Mar '21

14 Mar '21

Hello, I am using the "\loadpicture" capability in "\legendbox" constructs to include map sections, elevations, etc. It all works nicely on my PC where I am using relative paths to the pdf files. My club has a desire to archive the map data for posterity - ie if my pc dies or I go walkabout, the map data should still be available so that others can add to the maps as they are extended. I would prefer to have the images included using relative pathnames, rather than absolute pathnames, so that future explorers can download the map data and extend it, without having to duplicate my file hierarchy. How can I include relative paths in the \loadpicture functionality? Thanks, Rowena

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Two screen problem
by Andrew Atkinson 25 Feb '21

25 Feb '21

I've been ignoring this for many years, but now it is causing problems. If you have 2 monitors when xtherion is opened it takes a width of about the combined width but centres on one of the monitors. Some other programs, Firfox, seem to remember the last state they were in, lots do not, xtherion being one of them, it appears. There are some setting in XFCE for this, but playing with these has not had the desired results. If the monitors are the same size, which is mainly what I have had, I generally can make it full screen and it is fine to use, you can drag it across both screen and then change the size, but this is tedious. It is more of a pain when using a projector which I do when delivering training, but I tend to do that only a few times a year. However, with lockdown I have done some virtual training, and it appears that various VC and VR delivery method cannot cope well with a window bigger than a single screen, jitsi completely freezes the machine, zoom is not much better (on both Sound keeps working) I've solved this by not have the second monitor, however, it would be really good to use it, so prepared thing can be on it, also then I can have people on one and demo on the other, so if it is an easy fix I would be most grateful. Debian GNU/Linux bullseye/sid xfce 4.16 therion 5.5.7ds1-1 Andrew

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Request for new flags in Therion, Loch and Aven: waterflow?
by Evaristo Quiroga Raimundez 24 Feb '21

24 Feb '21

Hello, I have a request to the Therion and Survex programmers. I need two news flags in the Therion and Survex language: "waterflow" and "intermittent waterflow". And the implementaion in Loch and Aven to can visualize the active galleries with a diferent color (for example blue) from the rest of the cave. Thanks, Evaristo Quiroga.

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Question about "grid" command
by Benedikt Hallinger 24 Feb '21

24 Feb '21

Good morning, while debugging https://github.com/hbeni/therionsurface2survex/issues/1 i stumbled upon a format question i did not give tought until yesterday. With the "grid" command you specify coordinate origin and size of a surface grid: grid <origin x> <origin y> <x spacing> <y spacing> <x count> <y count> Until now i assumed that: a) these data has to be all positive. But i'm not sure... origin may surely get negative (like in wgs89 and for example western and southern of the 0-meridian/equator) And also stepsize - might it get negative too (esp. with flipped grids maybe)? b) the spacing might only be integer numbers, not floats Is this true? I just got an example with not-round stepsize.

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3D model height
by Balambér Hakapesz 23 Feb '21

23 Feb '21

Hi! When generating 3D models, Proj4 transforms between different coordinate systems. This also transforms the ellipsoidal altitude, but the data always refer to altitude above sea level and should not be changed. The finished models do not fit the topography, you have to cheat with the height to be good. Balázs Holl. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam…> Mentes a vírusoktól. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam…> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

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3d model - project selection not working
by עמרי גסטר 16 Feb '21

16 Feb '21

Hi all, I noticed that in the 3d model there is an option to select a specific project, but it doesn't work. There is no option to select it. Am I missing something? Is it a bug? [image: image.png] Omri

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texts_rs and a remark about karren vs anastomosis
by ivana miskovic 09 Feb '21

09 Feb '21

Hello, Here I put the translation file of map outputs in Serbian language. It would be great if texts_rs.txt were compiled in next Therion release. Also, unrelated to the translation itself, during translation I found some confusion in point symbols for karren and for anastomosis. It seems like they are inverted. Karren are generally sharp limestone formations on the floor, and anastomosis are usually remain like rounded rock formations in the cave ceiling. Unfortunately, in the UIS official symbol list, karren and anastomoses were put on the same picture. Thanx and c u in next surveyes, Ivana

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