[Proj] Proj4 cs2cs Program and the Geocentric Coord System
Karney, Charles
ckarney at Sarnoff.com
Wed Feb 4 14:32:20 EST 2009
> From: Gerald I. Evenden [geraldi.evenden at gmail.com]
> Sent: Wednesday, February 04, 2009 13:26
>
> Are we not back to the same business associated with the dead horse issue of
> TM (Transmogrification Meditation): unneeded accuracy and extended
> computational range.
[rest of the rant cut...]
Gerald:
I am willing to stipulate that for many purposes 1m (or 1cm or 1mm)
accuracy suffices.
However, I wish you, in turn, would recognise that there's also a need
for routines which are accurate to round-off and are valid for as wide a
range of inputs as possible. I deal with complex hardware and software
configurations and tracking down problems in such systems can be
incredibly difficult. Is the camera calibration wrong because:
* someone knocked the camera
* the sensors are out of whack
* the geographic database is misregistered
* the wrong vertical datum was used
* there's a bug in the graphics card
* the INU is acting up
The list is potentially endless. It's really, really, useful to be able
to exclude things like
* the UTM to geographic to UTM conversion is not an identity
I know this attention to detail can seem anal at times. However, that's
how robust systems are built. And in my case, people's lives are at
stake.
--
Charles Karney <ckarney at sarnoff.com>
Sarnoff Corporation, Princeton, NJ 08543-5300
URL: http://charles.karney.info
Tel: +1 609 734 2312
Fax: +1 609 734 2662
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