Hi Nick, Thanks for the insight into PocketTopo+Topparser. I am passing it back to the author of SexyTopo as well.
> By using PocketTopo and then using Andrew Atkinsons Topparser > [...] you have the option of producing a projected elevation .th2 along with > a projected xvi which shows all your splays and not just the centreline. It would be a bit late to switch to PocketTopo ;) But this is basically how I am doing it with Therion itself, which does not rely on an external app, and should work no matter what tool you use to collect your data. 1. Survey whatever I am going to survey, get the .th files for the centrelines. 2. Link them together. This step means that any projected lines pointing towards the camera are in their roughly final position (new loops can of course change that), so there is a lower chance of loop closures messing up the directions. This step is not needed, but it makes me feel better knowing that they will not be distorted as much after I draw them, and declination is catered to, etc. 3. Therion: source "cavesystem.th" #overall file, not the individual survey file select [email protected] #surveyname not mapname export map -projection [elevation 265] -fmt xvi -output "surveyname elevation265.xvi" 4. Therion. F2. Create a new th2 file, save as "surveyname elevation265.th2" 5. Edit - Insert image - select "surveyname elevation265.xvi" 6. Refer to the ee drawings with centreline, which were taken in the cave. Replicate them using the splays and centreline on the projected elevation. I'll see if I can add these various howto notes somewhere useful on the wiki. It would be lovely if - in step 3 - we could say "and use the extended elevation drawings as your basis" to make it export the drawing as well as the splays in the xvi, with the drawings wrapped around the centreline. It won't be perfect, but it would make it so much easier to trace over the parts where it is a good enough match, and just correct the parts that are too badly warped. But I think I am dreaming here. Martin's PDFs did a great job of showing why I came to the conclusion that I will have to do this manually, but imagine Martin's drawings with centreline and splays as your xvi to get you started, and it would be much nicer to work with that, rather than just a centreline with splays, and no passage sketch. Cheers, Tarquin _______________________________________________ Therion mailing list [email protected] https://mailman.speleo.sk/listinfo/therion
