Hi Omri, the problem is, that stations from pocket-topo XVI file are positioned differently than the final position calculated after loop closure. Therefore the problem with distortions. Your loop has a relatively large error (9%) and it is vertical one - therefore X-Y position of points is changed significantly.
I would suggest using just two stations in your 15X scrap for calibration (those, that are closest to the horizontal level of this section - e.g. 1_15, 1_16, 1_18) and let therion to plot other stations in this scrap automatically (using scrap option -stations [1_9 1_10 1_11 1_12 1_13 1_14]). S. On Mon, 7 Oct 2019 at 18:30, עמרי גסטר <[email protected]> wrote: > 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 <[email protected]> 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 <[email protected]> *On Behalf Of *alastair gott >> *Sent:* Monday, 7 October 2019 19:34 >> *To:* List for Therion users <[email protected]> >> *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. >> >> [email protected], >> M: 07931779380. >> ------------------------------ >> >> *From:* Therion <[email protected]> on behalf of עמרי גסטר < >> [email protected]> >> *Sent:* 06 October 2019 20:31 >> *To:* List for Therion users <[email protected]> >> *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 >> [email protected] >> https://mailman.speleo.sk/listinfo/therion >> > > > -- > בברכה, > עמרי גסטר > 052-6124995 > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion >
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