PostGIS  2.1.10dev-r@@SVN_REVISION@@
PG_FUNCTION_INFO_V1 ( RASTER_getPixelHeight  )

Return the pixel height of the raster.

The pixel height is a read-only, dynamically computed value derived from the Y Scale and the X Skew.

Pixel Height = sqrt( Y Scale * Y Scale + X Skew * X Skew )