Here is an example of what I mean: the cave I'll show is a pit and I made plan sketches as a horizontal sections. The extended profile turned out good. one of the plan sketches is distorted as you can see here:
[image: image.png] The original scrap is Kimron-1_15Xp, the new scrap is scrap26, so, I moved all the map elements except the stations, so now my scrap look like this ( the stations still exists in the .th file): scrap Kimron-1_15Xp -projection plan -scale [0 0 20 0 0 0 1 0 m] point 146.75 -130.52 station -name "1_9" point 162.64 -129.64 station -name "1_10" point 186.31 -124.43 station -name "1_11" point 198.19 -127.12 station -name "1_12" point 176.97 -115.01 station -name "1_13" point 191.00 -109.43 station -name "1_14" point 194.21 -92.76 station -name "1_15" point 182.67 -112.46 station -name "1_16" point 186.84 -71.79 station -name "1_17" endscrap scrap scrap26 -projection plan -scale [0 0 20 0 0 0 1 0 m] line wall -close on..... when I ran scrap26 the map is correct: [image: image.png] I used this Technic several times and it worked every time. On Mon, Oct 7, 2019 at 12:23 PM Bruce Mutton <br...@tomo.co.nz> wrote: > Omri, Alastair > > I would have thought it almost impossible to draw a whole cave without any > point stations in the th2 files, but yesterday a colleague who just > self-taught themselves Therion presented me with a 5km long cave that has > no point stations defined in the th2 (it has survey stations of course, > just not drawn in the scraps). It is also one of the better looking > Therion maps I have come across. I have yet to pick it apart to see why it > works and what the implications are. > > My suspicion is that it does not properly morph the sketches to the survey > network. > > > > In response to Omri’s question – if your survey is perfect, and the field > sketch as well, then of course an unmorphed drawing will be just fine. If > you have a real survey and sketch, subject to distortions due to loop > closures over multiple trips (multiple files), then the loops will not > match, and the drawing will need to be morphed due to loop closures and due > to scrap joins where the scraps are in different files or different > locations in the same file. > > > > If, when using Topodroid, as I have seen people over here do, you > accumulate all of your survey trips in a single file, and end up with one > huge sketch for the cave, in which you manually compensate for any > misclosures, then Therion has nothing much left to do. In that case, it > might be fine to do as you describe. Until someone finds the next big > breakthrough passage, then it may or may not be. > > > > Bruce > > > > > > > > *From:* Therion <therion-boun...@speleo.sk> *On Behalf Of *alastair gott > *Sent:* Monday, 7 October 2019 19:34 > *To:* List for Therion users <therion@speleo.sk> > *Subject:* Re: [Therion] scrap without stations keeps the original sketch > in Topodroid > > > > Hi Omri, > > > > You cannot have a scrap without any survey points in it. each scrap or th2 > file needs 2 or greater survey stations in it to function correctly without > warping the image. > > > > extended elevations are a bit different (and sometimes need careful > adjustment of the legs to fold the extended elevation in the correct way). > > > > [Caviat, I know you can have a th2 file with no survey stations in it, but > we're not creating rocks today wookware.org/surveys/therion/testrocks]. > > > > > > Regards, > Alastair Gott. > > alastairg...@hotmail.com, > M: 07931779380. > ------------------------------ > > *From:* Therion <therion-boun...@speleo.sk> on behalf of עמרי גסטר < > omri...@gmail.com> > *Sent:* 06 October 2019 20:31 > *To:* List for Therion users <therion@speleo.sk> > *Subject:* [Therion] scrap without stations keeps the original sketch in > Topodroid > > > > Hi all, > > I want to raise a question I've been having with my self... > > when I'm in the cave I use Topodroid to make the sketch. when I export the > map in Therion with "debug on" I see the changes that Therion makes which > make the final map different from the sketch I made in Topodroid (sometimes > it is a big difference). > > a few days ago I noticed that if I make a new scrap and move all the map > elements that I draw except the stations, the map turns out exactly as I > draw it on Topodroid. > > > > As I understand it, Therion change the map to overcome or compensate > errors or Deviations, especially when there are loops involved, but > wouldn't it be more accurate to stick to the original sketch that I drew > with Topodroid in the cave? > > what do you think? > > > > Omri Gaster > _______________________________________________ > Therion mailing list > Therion@speleo.sk > https://mailman.speleo.sk/listinfo/therion > -- בברכה, עמרי גסטר 052-6124995
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