Another option would be to get the coordinates of the linking mine station and fixing it, and just giving that station a „perfect“ Standards deviation (isn’t that default if not given?)
> Am 14.11.2020 um 21:29 schrieb Ben Cooper <[email protected]>: > > > Hi Alistair > I would definitely link all the survey centrelines. The implication is that > you have some errors in the survey, but you know that the straight mine level > needs to be straight so the error isn’t there. One thing you could try is to > set the SD for the level to be very low, and the SD for the rest of the cave > to be quite high. When Therion distributes the error, most of this should go > to the survey sections either the highest SD, and the level should be less > distorted. > Best regards > Ben > > > Sent from my iPhone > >>> On 14 Nov 2020, at 11:49, alastair gott <[email protected]> wrote: >>> >> >> HI Therion people, >> >> I'm helping with a project we've got a cave/mine system with a really >> straight mine level for one of the entrances, which we have the centreline >> data for (but no sketches to show where the points are). >> >> When the system was joined up together with all the entrances there was a >> kink in the mine level. so to counteract this, I removed some of the unknown >> survey points in the centre of the level and hung the survey on some points >> at the beginning and end of the level. >> >> I now want to add in a section of cave in the centre of the level. I have >> connected this quite well in a map at a lower level with just the one >> entrance coordinates in it, but when I run the full map with all the >> entrances in, the model then tries to remove the loop error by doing it's >> statisical wizardry. >> >> Unfortunately in doing so, it shifts the start of the level (the entrance) >> to the east. and then leaves the section of cave out unconnected. >> >> If anyone can help, then the config for the full system is here: >> http://www.cave-registry.org.uk/svn/PeakDistrict/Castleton/peak_speedwell_model/ >> >> This is what I get: >> >> <image.png> >> >> >> the config for the one entrance coordinate is here: >> http://www.cave-registry.org.uk/svn/PeakDistrict/Castleton/peak_speedwell_model/speedwell_mine/Speedwell_mine_thconfig.thc >> >> and these are the two selects if you want to run it at the lower level: >> select bottomless_pit.speedwell_mine >> select oakden_level.speedwell_mine >> This is what I want: >> >> <image.png> >> >> >> >> If I add in a survey point to hook it to, then I get this: >> <image.png> >> >> >> Rather than this: >> <image.png> >> >> >> Adding in more survey points further down the passage to the south only >> increases the amount of distortion in a small space of passage. as there are >> three loop closures at the bottom of the picture [just below the red circle) >> which the model is running (i've just not included the maps on the drawing >> for clarity). >> >> >> Regards, >> Alastair Gott. >> >> [email protected], >> M: 07931779380. >> _______________________________________________ >> Therion mailing list >> [email protected] >> https://mailman.speleo.sk/listinfo/therion > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion
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