[postgis-users] length_spheroid()

[Paul Ramsey]

This function does not seem to always work when supplying a two-vertex
linestring which is perfectly horizontal (eg 'LINESTRING(-75 45,-74 45)'
). Also, we need a corresponding distance_spheroid() which takes two
points.

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     | Paul Ramsey
     | Refractions Research
     | Email: pramsey at refractions.net
     | Phone: (250) 885-0632
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