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| extend [2025/03/01 06:55] – [Summary of all extend options, for survey centrelines] Add in-line guidance brucemutton | extend [2025/04/21 04:49] (current) – clarify extend ignore when used inline with survey data brucemutton |
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| The order of stations in your ignore statement should usually match the direction of extended elevation centreline generation. However if Therion seems to ignore your ignore statement, try reversing the order of the stations in your ignore statement, and it might work! In any case, try reversing the order to get a different effect (loop connection gap arrangement). Sometimes the leg specification needs to follow the direction of survey, if it differs from the current direction of extend generation.\\ | The order of stations in your ignore statement should usually match the direction of extended elevation centreline generation. However if Therion seems to ignore your ignore statement, try reversing the order of the stations in your ignore statement, and it might work! In any case, try reversing the order to get a different effect (loop connection gap arrangement). Sometimes the leg specification needs to follow the direction of survey, if it differs from the current direction of extend generation.\\ |
| ''extend ignore <station>'' - where <station> is one or more legs past a junction in the direction of generation. ie The generation of extended centreline shall not take this leg, but take another branch instead. The map-connection break will occur at <station>. A bug in this functionality was resolved with Therion version 094ac85 14Nov2019.\\ | ''extend ignore <station>'' - where <station> is one or more legs past a junction in the direction of generation. ie The generation of extended centreline shall not take this leg, but take another branch instead. The map-connection break will occur at <station>. A bug in this functionality was resolved with Therion version 094ac85 14Nov2019.\\ |
| | ''extend ignore'' - when used in-line without path, leg or station has not effect whatsoever. Therefore you may as well place the ''ignore'' statements in a block at the start of the survey or centreline, for the sake of having these important **control** functions readily accessible in one place. \\ |
| Try to avoid ''ignore''ing the same looped passage (ie an oxbow) at each of its junctions to a main passage. This can have the effect of offsetting the whole oxbow to the far end of the map (which of course is undesirable). \\ | Try to avoid ''ignore''ing the same looped passage (ie an oxbow) at each of its junctions to a main passage. This can have the effect of offsetting the whole oxbow to the far end of the map (which of course is undesirable). \\ |
| <del>''extend break''</del> is mentioned in some Therion posts, presumably as an alias for extend ignore (Survex terminology). It will trigger a Therion error “unknown extend flag – break”.\\ | <del>''extend break''</del> is mentioned in some Therion posts, presumably as an alias for extend ignore (Survex terminology). It will trigger a Therion error “unknown extend flag – break”.\\ |
| Sometimes branch centrelines will be ignored (hidden?) by default, and an extend right (or similar) statement will be required to stimulate the continuation of the centreline generation.\\ | Sometimes branch centrelines will be ignored (hidden?) by default, and an extend right (or similar) statement will be required to stimulate the continuation of the centreline generation.\\ |
| ''extend ignore'' - when used in-line - not sure, what happens [to do]\\ | |
| For more details of how to use ''extend ignore'', see the article [[breakingextend|Breaking extended elevations on specific stations]].\\ | For more details of how to use ''extend ignore'', see the article [[breakingextend|Breaking extended elevations on specific stations]].\\ |
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