Nyall Dawson bd9e02be95 Add alias support for expression functions
Standardise naming of all internal functions to lowercase with
underscore convention. Add aliases for old names to avoid
breakage.
2015-05-03 20:57:36 +10:00

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<h3>y_min function</h3>
Returns the minimum y coordinate of a geometry. Calculations are in the Spatial Reference System of this Geometry.
<h4>Syntax</h4>
<pre>y_min(geom)</pre>
<h4>Arguments</h4>
geom &rarr; a geometry
<h4>Example</h4>
<pre> y_min($geometry) &rarr; returns minimum y coordinate of $geometry</pre>