Marking survey-stations

[Michael Lake]

Roger Johansson wrote:
> I don't know is this list is still active bur I hope so since I need some
> advice from experienced surveyors. What is the best way to mark permanent
> survey-stations? 
....
> Is there any better way to do this? And should one be able to remove the
> station-markers in the future when the survey is considered to be finished?
> Leave nothing but footprints they said..

In Australia we have used in the past small copper pins hammered into drilled holes 
in the bedrock. Diameter was 3 or 4mm. They last forever and can be hard too see 
unless you know roughly where they. This to some extent advantageous as thet are not 
even noticed by the average caver or rabid environmentalist (i.e. the ones that 
insist that you cant have any permanent survey markers so you end up resurving the 
cave several times). From a map though with the permanent stations marked you can 
relocate them. For the number and size of copper rivets used there in *most* caves 
there would be no concerns about copper metal contamination. generally copper is 
biologically undesirable but in most caves its an alkaline environment so it wont 
leach out.

Mike
-- 

Mike Lake
Caver, Linux enthusiast and interested in anything technical.



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