[postgis-users] Calculate the distance

[Markus Schaber]

Hi, Gates,

gates jr wrote:

> My Question is : what measure unit that’s return by this query? Meters?
> Miles? Or another? If it’s not in meters how could I convert it to meters?

Its the original unit of your coordinates, which might be rather
meanlingless depending on your original coordinate system.

To get meaningful values, you can either:

- Reproject to a metric coordinate system
- use distance_spheroid
- use distance_sphere (faster, but approximates, and works only for
long/lat based coordinate systems)

HTH,
Markus

-- 
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf.     | Software Development GIS

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