Many many years there is the "length of centerline" term for it. It is defined.
Martin S. Odesláno z iPhonu 10. 6. 2018 v 14:33, Marco Corvi via Therion <[email protected]>: > i put together comments to all the posts > about "extend" > > (1) yes, -1 = left, 1 = right and vert is in the middle (0) > > (2) evaristo, with his proposal of idealized profile not only suggested a way > to control shortening, but that also allows stretching. that's good > > (3) bruce described a procedure for a program to automatically decide how to > draw splays in the extended profile. > it's more or less what topodroid implements: at a station the range of > azimuths is divided into angular sectors one for each leg at that station. a > splay is "projected" using the leg of the sector its azimuth falls in. (by > the way, to really be in bad luck one need three vert in a row) > > (4) a program may assign extends to splays automatically, but the user should > always be allowed to override what the program does. > (that's why a user can set extend also for splays, in topodroid) > > (5) "cave length": in the (old) manuals i studied that the cave length is > "computed" measuring the length of an ideal line that goes thru the middle of > the passage. > now it is rather cumbersome to compute that line, and all the programs uses > the length of the midline, with some discount (duplicate in therion, L in > compass, and so on). > the problem, i think, is that cave length is not a thing that can be > well-defined. > so the numbers we give for cave length are an approximation of a fuzzy > concept. > > marco > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion _______________________________________________ Therion mailing list [email protected] https://mailman.speleo.sk/listinfo/therion
