[patch] cavern in feet

[John B. Halleck]

Oh, and I forgot, some states have SPC that are legally in meters, so the reduction to SPC from feet also makes a non-trivial difference in those states.

________________________________

From: survex-bounces at survex.com on behalf of John B. Halleck
Sent: Wed 2007-10-24 10:15
To: David A. Riggs; survex at survex.com
Subject: RE: [patch] cavern in feet


Is this "International feet" (2.54 cm/in) as required for legal surveys in several US states,
or is this US Survey feet (39.37 in/meter) as required for legal surveys in several other US states?
 
Due to the legal definitions of State Plane Coordinates in most states (Usually biased by 10's of thousands of feet to avoid negative coordinates of within the state boundries) the difference between the two kinds of feet can be meters different on the ground.
 
And since, in some states, organizations providing surveys have to reference surveys to SPC's, it is bound to eventually be an issue for someone.  (And at least one other cave survey program makes the distinction because on of their users had this issue.)
 

________________________________

From: survex-bounces at survex.com on behalf of David A. Riggs
Sent: Tue 2007-10-23 14:36
To: survex at survex.com
Subject: [patch] cavern in feet



Unfortunately for the rest of the world, cavers here in the US still
insist on using feet instead of metric measurements for our surveys.
The following patch (cvs diff -u) adds an option (-f or --feet) to
`cavern` which displays all output using feet instead of meters.

$> patch -p0 < cavern_in_feet.diff

- DR

--
David A. Riggs <david.a.riggs at gmail.com>


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