Nine decimals is what is used for WAAS reference stations, which appear in Wikipedia.
< http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#List_of_reference...
I actually also think it is a bit excessive, but it is there and looks legit. I'd rather support it than not (and save 20 MB of disk space).
Some of the validations sound useful (no values greater than 360), others a bit restrictive (same number of decimal places). I'd prefer the software to be rather lax than draconic (it *is* a wiki, after all). I agree about trailing zeros. They are covered by the precision parameter.
Thanks for the input! Cheers, Denny
2013/1/17 Andy Mabbett andy@pigsonthewing.org.uk
On 17 January 2013 10:19, Denny Vrandečić denny.vrandecic@wikimedia.de wrote:
If you have any further comments on the datatype for coordinates, say so here.
<
http://meta.wikimedia.org/wiki/Wikidata/Development/Representing_values#Coor...
Nine decimal places seems excessive.
We can apply some rudimentary validation: no latitude or longitude values greater than 360, for instance (perhaps other criteria dependent on the coordinate system); latitude and longitude should have the same number of decimal places; trailing zeroes are significant and must not be discarded.
-- Andy Mabbett @pigsonthewing http://pigsonthewing.org.uk
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