May 2020 - 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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Need metapost wizard: new text label
by Benedikt Hallinger 16 Jun '20

16 Jun '20

Hi there, i need some new point symbol (text label). Its a simple text on white color within a box with rounded corners, like the attached image. My metapostskills are not good enough to get this to work... For now i would be happy to have such a user point symbol. It would be important that it scales well and react to xtherions direction setting. Optional it would be cool if the default symbol could show the current survey identifier of the nearest station in the scrap and maybe also the nearest next survey. But this information could also be maintained manually for now. Is there someone here for my rescue? :) Thanks in advance, Beni

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North arrow and magnetic declination
by Bill Gee 02 Jun '20

02 Jun '20

Hello everyone - I was looking at some of the sample code on the wiki for alternate north arrows. At least two of them display both geographic north and magnetic north. Those are northarrow4 and northarrow4a, both by Dirk Peinelt. My question is this: What date is used when calculating the offset angle for the magnetic north arrow? This is especially relevant for caves that have been surveyed over a period of years. The declination changes from year to year, and sometimes more often than that. There are at least four possibilities: 1) The date of the first survey. 2) The date of the most recent survey. 3) A date about half-way between the first and last surveys. This assumes that the declination change is somewhat linear over time. 4) The date the map is compiled. Does anyone know which date is used? For me this is mostly academic. I am just curious! I have never used a north arrow that shows both geographic and magnetic north. Most of the maps I make are for caves in Missouri. The magnetic declination is less than 1 degree. It is almost irrelevant here. Thanks! -- Bill Gee

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extend
by Marco Corvi 02 Jun '20

02 Jun '20

i think that extend should take values in the interval [-1,1], ie also fractional values, plus some special value such as "ignore" to open loops, and "undefined" to let the program choose, because it's a nuisance to enter a decimal number for every shot (legs + splays). therion uses the left/right normal/reverse etc. solution, and users should be allowed to set extend also for splays, if they need to. for now, let's use left/right/vert, and ignore only to open loops btw, are vertical extend considered in the computation of the cave length by therion ? marco

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Output without splays
by Michael Ross 16 May '20

16 May '20

Hello, How do I generate a .plt or .pdf file without splays? Thanks, Michael.

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For JM Begley - Rebuild for Fedora 32
by Bill Gee 08 May '20

08 May '20

If it is not already in progress ... The Therion package in JM Begley's COPR repository needs to be rebuilt so it works on Fedora 32. When I try to run the upgrade from F31 to F32, it gives me this: ================ <snip...> Problem 3: package therion-5.4.4-2.fc31.x86_64 requires libproj.so.13()(64bit), but none of the providers can be installed - proj-5.2.0-5.fc31.x86_64 does not belong to a distupgrade repository - problem with installed package therion-5.4.4-2.fc31.x86_64 <snip ...> ================= Thanks! -- Bill Gee

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new Therion 5.5.0
by Therion 01 May '20

01 May '20

Hi, there is a new release 5.5.0 of Therion. Release notes: v5.5.0 Therion 5.5.0 (2020-05-01): therion: * maps-offset <on|off> feature in thconfig file to disable maps drawn in offset [#159] * maps <on|off> feature in thconfig file to produce map just from scraps, ignoring the maps definition * log extend feature in thconfig to log extended elevation construction * added point mudcrack (thanks to Rodrigo Severo) * added an extensive SBE symbol set (thanks to Rodrigo Severo) * geomag data updated up to 2025 * added support for reproducible generation of PDF and SVG output (command-line option --reproducible-output) * make thbook.pdf build reproducible (derive the created/modified dates of the PDF file from the commit date) * improved support for Proj 6.0 and 7.0 (see proj-auto init file option) * Catch2 unit testing library and Proj test cases added * all python scripts use Python 3 now * added Serbian (thanks to Ivana Miskovic) and Slovenian [PR#142] translations * updated Portuguese translation [PR#170,220] * thbook improvements by Benedikt Hallinger [PR#161,162] * bugs fixed - spelling in some thbook chapters - html and kml output [PR#145,150] - extend ingore <station> fixed - Survex 3D output is missing the nodes on the end of anonymous splay legs [#157] - a_blocks_AUT missing semi-colon [#126] xtherion: * add thconfig* to selectable config file list [PR#168] * bugs fixed: - Windows xtherion window geometry bugfix loch: * bugs fixed: - MacOS X compilation [PR#144] - multiple minor fixes - Linux off-screen rendering bugfix Best regards, Therion team

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