[Taxacom] Impossible geocodes

mesibov at southcom.com.au mesibov at southcom.com.au
Fri Jan 30 04:42:01 CST 2015


Apologies! That'll teach me to write a post just before going to bed!

My examples in the draft post were longitudes, whose extents *do* vary
with latitude, and the uncertainties I gave apply to longitudes at
latitude 43 etc south.

Latitude distances do not, of course, change with latitude. One degree of
latitude is ca 111 km anywhere, so the uncertainties in latitude are:

1 second = ca +/- 15 m
1 degree = ca +/- 920 m
0.0001 degree = ca +/- 5.5 m
0.00001 degree = ca +/- 0.6 m




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