[postgis-users] Scale

[Kevin Neufeld]

What if you compared the "widths" of your two geometries by looking at 
the difference in the xmax and xmin?  You can then compute the relative 
size ratio along the x-axis to be used in the second parameter of 
ST_Scale(geometry g, int x, int y, int z).  Do the same for the y and z 
axis.

-- Kevin

Bob Pawley wrote:
> I want to scale a geometry of unknown size to the same size as a 
> standard geometry.
> 
> ST_Scale(geometry, float8, float8) - this function does the job but the 
> releative size needs to be known as a float8.
> 
> Is there a method of establishing the float8 by comparing the relative 
> size of the two geometries. (I've looked at St_Difference but it just 
> returns a geometry).
> 
> Bob
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