[MetaCRS] Axis order in CS Test file
Martin Davis
mbdavis at refractions.net
Mon Nov 30 17:37:46 EST 2009
I'd really like to get this issue settled, since I'm currently cutting
code to parse and execute the CS Test file format. 8^)
As I see it a summary of the arguments is:
Option #1 - axis order follows order specified by CS authority
- follows EPSG & OGC convention, which is currently the authority with
most weight
- simpler for libraries which currently handle axis order explicitly
Option #2 - axis order of geodetic coordinates is always long/lat
- adheres to Principle of Least Surprise (order is consistent between
src and tgt coordinates)
- simple to document as part of the CS Test format specification
- test format can be interpreted without reference to CS specification
- simpler for libs such as Proj4 and CS-Map which currently work this way
One other thing that to me seems to be in favour of Option #2 is that
libs which currently handle axis order explicitly should be able to deal
with this easily (as evidenced by Martin's reply). Whereas this is not
so much the case for Option #1 and libs which expect long/lat order.
Shall we put this to a vote?
--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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