January 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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"\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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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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Splays appearing when not selected
by Rhys Tyers 06 Feb '21

06 Feb '21

Hello, I have noticed something that I am not sure if it's a bug or not. I am trying to export a selected bit of a survey as a loch file: source "data/system_migovec.th" select vrtnarija_vilinska@system_migovec export model -o outputs/vrtnarija.lox This seems to correctly export the centerline only for "vrtnarija_vilinska" but if I turn on the walls in loch then other bits of the survey are shown. Centerline correct: [image: image.png] With walls there are other bits of passage shown: [image: image.png] These seem to correspond to bits of passage that have splays and LRUD data so it seems like those aren't correctly filtered out using the "select". Using: therion 5.5.6 (2020-12-27) - using Proj 6.3.1, compiled against 6.3.1 Thanks, Rhys

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specific which label appears in output
by Axel 31 Jan '21

31 Jan '21

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Matrix of heights from Lidar data?
by Martin Sluka 22 Jan '21

22 Jan '21

Hi, anybody has a recipe how to extract matrix of heights from Lidar data preferred a free solution. Martin

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Metapost inspirations
by Martin Sluka 15 Jan '21

15 Jan '21

Some advanced Metapost code for ancient looking illustrations (or maps): https://github.com/jemmybutton/fiziko https://m.habr.com/en/post/454376/ https://habr.com/ru/post/423571/?_ga=2.47603047.1584527340.1610742907-19622… Enjoy Martin

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new Therion 5.5.6
by Therion 13 Jan '21

13 Jan '21

Hi, there is a new release 5.5.6 of Therion. Release notes: v5.5.6 Therion 5.5.6 (2020-12-27): therion: * fixed map statistics bug introduced in 5.5.5 Best regards, Therion team

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