From: R Knapp (gyp_caver_at_yahoo.com)
Date: Sun Mar 10 2002 - 00:30:56 CET
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Situation:
Surveying down the passage with front and back sights. Lead tape set a wonderful station
to shoot back from but not to shoot forward. When the Front sight person tries to read
the instrument, the position is so akward they cannot get a consistent reading and
nothing even close to +/- 2 deg. Since the back sight is good, it is agreed that value
should be used during compilation.
Back in the house, the data is being entered in X (Compass, Survex, On Station, etc). But
if a value is entered for the front sight, it is taken as the correct azimuth instead of
the backsight. The only way (at least in Compass) to ignore the front sight is to mark it
as 'Missing'.
Discussion:
This could happen due to various circumstances but is common. The problem is how to
retain the fact a front sight was done (and its value?) but indicate to the data
compiling program the value should be ignored.
Would something along the line of:
<Azimuth direction="Front" value="340" ignore="yes"/>
work? Or maybe:
<Azimuth value="340" process="no"/>
The only problem for these is the default would be implied unless the attribute appears.
It works but having something implied is not very specific. IMHO, the penalty for being
verbose and clear is small. However, I wouldn't want a process attribute on every shot
subelement. I don't think there is as much of an issue with the 'ignore' as it is with
'process'. Probably because the implied is 'no' instead of 'yes.' It's also pretty clear
the value is being ignored .. although not where it should be ignored. ARGH! <g>
FWIW, based upon the previous discussion on canonical vs read (field) values, I also
added a "reading" attribute to all shot measurements. This serves as the repository for
data when the field units do not match the canonical units.
Richard Knapp
gyp_caver_at_yahoo.com
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This archive was generated by hypermail 2b30 : Sun Mar 31 2002 - 23:00:01 CEST