[postgis-users] PointM, PolyLineM, PolygonM

[Paul Ramsey]

What do people think about supporting measures in general? There are two 
possibilities:

(a) keep the geometries as they are and have and "measure dependant" 
functions assume that the coordinates are (X,Y,M)
(b) expand to 4-d standard geometries, (X,Y,Z,M)

I lean towards option (a), since most people aren't even using xyz 
geometries now, let alone xyzm. A little flag on the geometry could 
indicate whether the geometry is xym or xyz.

Any then of course we'd need to figure out what useful "measure-smart" 
functions would be useful for a LRS implementation in postgis.

P.

strk wrote:
> Hello Jeff,
> are you planning to include any kind of support for
> shapefile "measured geometries" types in shp2pgsql ?
> 


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      | Paul Ramsey
      | Refractions Research
      | Email: pramsey at refractions.net
      | Phone: (250) 885-0632
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