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Aaron Addison wrote:Spike is correct. None of the current software will address 3D issues in morphing. None seem to work with profile data either.
AA
Aaron Addison wrote:Spike is correct. None of the current software will address 3D issues in morphing. None seem to work with profile data either.
Spike wrote:Sluka,In the SVG/Walls Round tripping process, if an upper level passage moves due to a change in survey, the lower level passage is also moved even with no change in survey.
Yes, when I got the older data to start working I had a compass error on the 4th shot of 2 miles of survey. It would be months before I could go into the cave so I drew the cave with the bad data and let the round tripping fix the map after I was able to return to the cave and fix the error. With the round tripping process having bad data that skews the map is no excuse for not drawing up the good stuff. The only really challenge to keeping a working map current is the actual drawing, rather than holding back waiting for fixing bad loops, poor backsights, etc. . . Hopefully this will help cure the cave surveyed, not drafted rash that goes around.
Spike wrote:With the round tripping process having bad data that skews the map is no excuse for not drawing up the good stuff. The only really challenge to keeping a working map current is the actual drawing, rather than holding back waiting for fixing bad loops, poor backsights, etc. . . Hopefully this will help cure the cave surveyed, not drafted rash that goes around.
Stan Allison wrote:Yes, I do divide the Dry Cave data up into six separate stratigraphic/cartographic levels using the #Segment command in Walls. When I first started drafting Dry Cave using the Walls/Illustrator/SVG roundtripping process, I was concerned that roundtripping changes in an upper/lower level would cause an undesirable change in an upper/lower level. By dividing the map into six levels I have avoided any potential problems. It is quite easy to combine the separate levels into a single map when desired. Incidentally, the Walls #Segment command is a really useful tool.
Spike wrote:Footleg,
A good description of the SVG Roundtripping process is available at the following link
http://www.cavediggers.com/techsurvey.pdf
Also, you are effectively doing the same thing using Survex and Tunnel, but like Stan said, with Illustrator we are using a commercial drawing program to do our artwork.
Jeff wrote:
Do you roundtrip the levels separately? I can't remember
What about the tie-stations? For example, if station A31 is the threshhold between level 3 and level 4, and there is a change nearby on level 3 that causes it to move, how does it still line up properly? Do you have to use the #FIX directive to prevent this from happening?
Stan Allison wrote:So my question to Therion and Survex/Tunnel users is do these programs actually adjust the cave map based on the actual survey line or just the nearest survey station/line as in Walls/Illustrator? Will they also work for profiles? Walls/Illustrator will only roundtrip plan views at this point.
Stan
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