[Therion] Surface profile in elevation maps

[Steve Clark]

 > I'll add the gpsvisualizer to the Therion wiki, as it looks like a 
good way to get a smoothed ground profile over a cave centreline. >Just 
so I'm clear, did you just upload your therion generated kml file here?

Yes, I used the 'model' version of the .kml file, with the x, y 
centreline coordinates. For the output, I just copy and pasted from the 
website text box, added station names in excel and pasted back into 
therion as fixed stations. The only issue I have noticed is that you 
seem to get an extra point at the end of the dataset that is back at the 
start of the path.


I think I understand the map & survey structuring a bit better now. 
Thanks for the links. I can see I need to create a scrap for the surface 
to make it visible. My structure, albeit non-existent, wasn't the problem!

I have used the following process to add the ground profile to both the 
extended and elevation pdf projections:

Export a .kml model of the cave centreline
Import to gpsvisualiser to add the ground altitudes to each co-ordinate
Create a new centreline survey with fixed stations for this set of lat, 
long, alt coordinates
Export an .xvi of this survey
Import the .xvi into therion graphical editor
Create a scrap, referencing some of the stations
Trace the stations with a line (I have currently used 'walls', but I am 
open to suggestions for a better line to use?).
Include this scrap and the centreline survey in the exported map.

Sample work-in-progress here :
https://dl.dropboxusercontent.com/u/4064739/draft_extended_04sep2013.pdf

 From a cave diving perspective, it would be useful to add local zero 
depth lines using a similar process. Is there an appropriate line type 
to use for this?

Steve