On 02/20/2013 02:01 PM, Jens Alfke wrote:
On Feb 19, 2013, at 12:46 PM, Luca Morandini
<[email protected]> wrote:
Well, there it goes my academic track paper on CouchDB and GeoCouch for
FOSS4G '13 :(
Are roundoff errors on the order of one part in 2^56 really a deal-breaker for
your application? I mean, “17.300000000000000711” does _look_ ugly compared to
“17.3”, but the difference is completely negligible for most purposes. Have you
worked out how many significant figures of accuracy you need, and are the
results correct to within those significant figures?
Well, it is not a matter of precision -as it may be enough for most purposes- but
of external representation: every user would expect to get back the same data he
had put into the database.
Another issue is the sheer size of produced JSON: we use a lot of geo-spatial
data, and chopping off digits would be a performance boon.
Regards,
Luca Morandini
Data Architect - AURIN project
Department of Computing and Information Systems
University of Melbourne
Tel. +61 03 903 58 380
Skype: lmorandini
