[postgis-users] 2d VS 3d Point

[Craig Miller]

I would keep time a separate field.  It isn't a spatial dimension.  Temporal
analysis (time series, etc) and even spatio-temporal analysis typically have
time as a separate parameter.  You may be looking for interactions between
space/time, but they don't measure the same thing.

--Craig


-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Eli
Dylan Lorimer
Sent: Thursday, April 21, 2005 8:32 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] 2d VS 3d Point

Hola,
I'm creating a table to store waypoints from a GPS. Ultimately, I'll be 
creating a 3d visualization system based off of Hagerstrands space-time 
cube - so time will be the 3rd dimension. My question is, in your 
(anybody's) expert opinion, should I use a 2d point object to store the 
lat/lon location and then keep time as a separate attribute 
(aggregating them when needed) or store lat/lon/time as a 3d point 
object which I can then map to a java class? Any thoughts?
Cheers,
./dylan

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