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extend [2018/05/01 12:45]
brucemutton [Summary of all extend options, for survey centrelines] hide uncertainty
extend [2018/05/03 11:13] (current)
brucemutton [Extended elevation scrap drawing considerations]
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 ====Extended elevation scrap drawing considerations==== ====Extended elevation scrap drawing considerations====
-If you have drawn a scrap with the opposite orientation to the extended centreline generation, it will tend to plot inside out.  You need to compensate for this by including ''​-flip horizontal''​ in the definition of your scrap. ​ Or you can add ''​-revise scrap id -flip horizontal''​ in your Extend-CaveName-ElevEXT.th file **(I need to check the details of this)**.+If you have drawn a scrap with the opposite orientation to the extended centreline generation, it will tend to plot inside out.  You need to compensate for this by including ''​-flip horizontal''​ in the definition of your scrap. ​ Or you can add ''​-revise scrap-id -flip horizontal''​ in your Extend-CaveName-ElevEXT.th file.
  
 If you include in your scrap drawing a ''​point station -name <​station>''​ where that <​station>​ is at a survey leg junction AND is offset in the extended centreline due to extended loop misclosure, then it will force the extended station to plot, incorrectly,​ in its original location, distorting the scrap in the vicinity of that leg.  This can be vexing, as \\ If you include in your scrap drawing a ''​point station -name <​station>''​ where that <​station>​ is at a survey leg junction AND is offset in the extended centreline due to extended loop misclosure, then it will force the extended station to plot, incorrectly,​ in its original location, distorting the scrap in the vicinity of that leg.  This can be vexing, as \\
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 b) generally the station that you cannot draw is a marked station (cairn or otherwise identified station) that you are most likely to want to identify on the drawing!\\ b) generally the station that you cannot draw is a marked station (cairn or otherwise identified station) that you are most likely to want to identify on the drawing!\\
  
-Now most of the established ​ Therion documentation describes how to create a map-connection line between ends of loop.  However I have never done this, as it seems to be built into Therion these days.\\+Now most of the established ​ Therion documentation describes how to create a map-connection line between ends of loop.  However I have never done this, as it seems to be built into Therion these days, at least for centreline plots.\\
 However for completeness here is the code for a scrap to draw a connection line.  For now I will put it here as a placeholder,​ until we figure out if it still has a practical application. However for completeness here is the code for a scrap to draw a connection line.  For now I will put it here as a placeholder,​ until we figure out if it still has a practical application.
 The famous [[https://​therion.speleo.sk/​samples.doc/​25.html|Extended elevation control sample]] The famous [[https://​therion.speleo.sk/​samples.doc/​25.html|Extended elevation control sample]]
  • extend.txt
  • Last modified: 3 weeks ago
  • by brucemutton