[postgis-users] PointM, PolyLineM, PolygonM

[Paul Ramsey]

Is is possible to have measure *and* elevation in a shapefile? XYZM? Or 
is it only XYZ and XYM?
Paul

Frank Warmerdam wrote:
> Paul Ramsey wrote:
> 
>> Since the measures are a vertex-by-vertex measurement, not a 
>> feature-by-feature one, they cannot be dropped into an attribute 
>> table, generally speaking.
> 
> 
> Paul,
> 
> But they could be kept in an "array" field, couldn't they?  I realize
>  this would lose the explicit relationship with the geometry and it
> might get out of sync if operations were done, but it seems like a
> cheap way to incorporate the data now.  The loader could give an
> option to do this, or to insert as the Z coordinate in the geometry.
> 
> Best regards,
> 


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