October 2019 - 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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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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World Magnetic Model
by kevin dixon 28 Feb '20

28 Feb '20

The last Therion release 5.4.3 is dated 01 Feb 2019. There has in recent years been a significant change of the Magnetic North Pole location, less so for the Geomagnetic South Pole: https://ngdc.noaa.gov/geomag/GeomagneticPoles.shtml Given the above, an out of cycle World Geomagnetic Model WMM2015v2 was released 04 Feb 2019. When will this update appear in Survex and Therion ? Thanks, Kevin Dixon

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Export Multiple Caves to Single KML Model
by Bruce Mutton 22 Nov '19

22 Nov '19

> There is one feature I have found that does not work. . One of my four maps has a section where two passages run pretty much the same way, one directly above the other. In the single-cave map I handled this by setting the upper passage off to the side. That does not come through to the group map. The two passages are drawn on top of each other. Bill I presume you are now referring to exported map pdf outputs? I was looking for something that fitted that description in an old copy of your Big Cavern Ranch project that I got from one of your posts last year, but didn't find anything. In general, if you select and export a map that has offsets defined, they will be honoured. I you do not specifically select a map with the offsets defined, then the scraps will be plotted in their true position - no offset. I do this intentionally for overview maps of multiple caves, as offsets at small scales (1:2,000, 1:10,000) provide a misleading impression of the cave. It seems like you have done this as well, perhaps unwittingly. Your source BigCavernRanch.th contains a survey named 'all' but there is no corresponding map defined as far as I can see. Therefore despite each of those caves referenced having maps defined, they are not used - every scrap defined is used instead. So no offsets. >From the Therion Book. 'select' Description: selects objects (surveys and maps) for export. By default, all survey objects are selected. If there is no map selected, all scraps belonging to selected surveys are selected by default for map export. You can easily control what is plotted by defining a 'map all' in your BigCavernRanch.th file (or elsewhere) and then selecting it in your 'all' thconfig. Bruce

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Horrific Warping between maps where I want my lines to join
by alastair gott 03 Nov '19

03 Nov '19

Hi Therion Mailing List, My maps are just not joining where I want them to, the walls are repellant to each other! All I want to do is join the black line where i'm putting the red line, but the yellow warping lines are thrusting it away again. If anyone has any thoughts it would be great to know them because there's something fundamentally wrong with what I'm doing! [cid:206d78da-11f6-41f7-b5bf-6b26829ce45f] Regards, Alastair Gott. AlastairGott(a)hotmail.com, M: 07931779380.

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***UNCHECKED*** Horrific Warping between maps where I want my lines to join
by Bruce Mutton 31 Oct '19

31 Oct '19

Sorry Alistair I was too quick to respond. Your original image suggests that when you first posted the repository scraps were well matched, so my advice is redundant. So there is something else going on. Without delving into it I would guess an inappropriate point station in the drawing. Bruce From: Bruce Mutton <bruce(a)tomo.co.nz> Sent: Thursday, 31 October 2019 19:27 To: 'List for Therion users' <therion(a)speleo.sk> Subject: Horrific Warping between maps where I want my lines to join > The walls ends between the 2 scraps that you try to join are far from each other (1 passage is 10 m large, the other 20 m large), so even if you can join them, you will have strong distortion, like in the attachment. Xavier has identified the problem here. It looks to me like a survey sketching, drawing or user interpretation of survey data error. The red lines are the undistorted scraps, and mimic exactly the shape of the scraps in the th2 files. The red scrap outlines can be seen to overlap significantly. Therefore, Therion has made a sensibly minimal morph to bring the scraps together (black lines). It is working perfectly. My first rule of joining scraps is to make sure they match approximately before invoking join, otherwise Therion will continually thwart your attempts. Step 1. Comment out the join Step 2. Make edits to the individual scraps so the wall lines nearly join Step 3. Reinstate the join Bruce

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Horrific Warping between maps where I want my lines to join
by Bruce Mutton 31 Oct '19

31 Oct '19

> The walls ends between the 2 scraps that you try to join are far from each other (1 passage is 10 m large, the other 20 m large), so even if you can join them, you will have strong distortion, like in the attachment. Xavier has identified the problem here. It looks to me like a survey sketching, drawing or user interpretation of survey data error. The red lines are the undistorted scraps, and mimic exactly the shape of the scraps in the th2 files. The red scrap outlines can be seen to overlap significantly. Therefore, Therion has made a sensibly minimal morph to bring the scraps together (black lines). It is working perfectly. My first rule of joining scraps is to make sure they match approximately before invoking join, otherwise Therion will continually thwart your attempts. Step 1. Comment out the join Step 2. Make edits to the individual scraps so the wall lines nearly join Step 3. Reinstate the join Bruce

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kml icon path
by Bruce Mutton 30 Oct '19

30 Oct '19

Hi Martin My kml file icon paths seem to match those in Bill’s example kml files. https://therion.speleo.sk/downloads/KmlIconEntrance.png https://therion.speleo.sk/downloads/KmlIconMap.png These two work just fine if I follow the path in my browser. I see the nice therion icons. So the kml file paths seem to be OK. https://therion.speleo.sk/downloads/KmlIconModel.png This one gives 404 not found error. So perhaps the name has changed on the therion site?? However if I open the kml files in Google Earth, I just get red Xs for all of the entrances (Bill’s examples and mine) and no icons in the places legend. It used to work just fine until a maybe few months ago. Maybe there is a problem with my Google Earth application or options? Bruce From: Therion <therion-bounces(a)speleo.sk> On Behalf Of Martin Sluka via Therion Sent: Tuesday, 29 October 2019 21:22 To: List for Therion users <therion(a)speleo.sk> Cc: Martin Sluka <martinsluka(a)mac.com> Subject: Re: [Therion] Export Multiple Caves to Single KML Model Those red Xs are sign that there is not correct path to that nice entrance icon. Check your kml (ASCII) file. Martin Odesláno z iPhonu 29. 10. 2019 v 8:40, Bruce Mutton <bruce(a)tomo.co.nz <mailto:bruce@tomo.co.nz> >: Yes, it should work just fine. I have a least one from earlier this year with seven cave centrelines and many surface points. Only thing that has gone bad (for me) in recent months is that the nice entrance icons are now red Xs. <image001.png> Bruce From: Therion <therion-bounces(a)speleo.sk <mailto:therion-bounces@speleo.sk> > On Behalf Of Scott Falkingham Sent: Tuesday, 29 October 2019 17:24 To: therion(a)speleo.sk <mailto:therion@speleo.sk> Subject: [Therion] Export Multiple Caves to Single KML Model Hi Folks, Is it supported to export a model of multiple caves to a single KML file? When I attempt the export, the entrance placemarks of both caves show up, but only the first sourced caves centerline is exported. Not only that, all of the placemarks are grouped in a single folder. Conversely, exporting a cave-list of multiple caves to KML works as expected, with both caves showing up in individual folders. Thanks. Scott _______________________________________________ Therion mailing list Therion(a)speleo.sk <mailto:Therion@speleo.sk> https://mailman.speleo.sk/listinfo/therion

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