JP
As a hack, how about temporarily making the survey station near the debris
an entrance. Then an export to a cave-list will give you the coordinates
directly.
Eg
export cave-list \
-location on \
-surveys off \
-output ../Output/MiddleEarthcaves.html
Or of you use .kml extension you get a Google Earth file directly.
I'm assuming you want the easiest way to walk to the surface location
directly above the cave, and have a gps unit into which you can enter these
as way points. Re-reading you question that might not be what you want.
There might be other approaches using continuation flags, and or obtaining
the coordinates from an sql export or from a model export to .3d and use
Aven to obtain coordinates.
Bruce
_____
From: therion-bounces at speleo.sk [mailto:therion-boun...@speleo.sk] On Behalf
Of McLendonJP at aol.com
Sent: Tuesday, 3 June 2014 9:17 a.m.
To: therion at speleo.sk
Subject: [Therion] How to locate points on the surface above a
surveystation?
I would appreciate any suggestions regarding the best (easiest, quickest)
way to locate points on the surface that directly overlie survey stations in
the cave. For example, suppose we find a place in the cave with surface
debris and would like to examine the surface directly above for an entrance
or dig. The ideal solution would allow me to input surface survey data in
the field using a laptop and would generate an azimuth and distance from the
last station to the desired point. I've sometimes overlayed the cave map or
lineplot onto a topo or satellite image to identify the general area, but
I'm looking for a much more precise solution. Currently, I survey overland
from the entrance toward the area overlaying the station I want to get
above. As I get close, I temporarily rename the last surface survey station
to the name of the station in the cave below. This tells Therion that I've
closed a loop and it gives me the closure error in all three axes. The x and
y axis tell me how close I am, and I can guesstimate an approximate azimuth
for the next shot to get closer. This eventually gets me close, but it is
subject to blunders and overly time consuming. Is there a better way,
perhaps through some function of Therion with which I am unfamiliar? Thanks
for any ideas.
JP
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