[postgis-users] PointM, PolyLineM, PolygonM

[Paul Ramsey]

strk wrote:

> I think using the Z field could be ok, but we need a function that tell
> us wheater a geometry is 2d,3d or measured.  Does OGC say anything about
> measures ? 

Nothing. Heck, they don't even say anything about Z.

> The array option might also work as a temporary solution, as
> would do a just-drop-measure approach.

I think we should add the possibility of using the current Z slot to 
hold M, and a flag to indicate which of the two it is holding (if any). 
In the meantime shp2pgsql can be modified to support GeometryM types, 
placing the values in the Z slot. I am not so comfortable with the array 
solution.

> ... shp2pgsql could give a few options (--measured-policy=[array|discard])

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      | Paul Ramsey
      | Refractions Research
      | Email: pramsey at refractions.net
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