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List:       postgis-users
Subject:    Re: [postgis-users] PointM, PolyLineM, PolygonM
From:       Paul Ramsey <pramsey () refractions ! net>
Date:       2003-02-28 17:21:05
Message-ID: 3E5F9A81.5070203 () refractions ! net
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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 ?
> 


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