[postgis-users] 3-D coordinates

[joe at omc-international.com.au]

We tend to use something like the following:

create table soundings (
id serial primary key,
elevation float,
the_geom geotmetry
)

for bathymetry data from which we calculate statistics based on the depth
or elevation of soundings within polygons.

> I'm somewhat surprised I don't see much on 3-d coordinates (ie New
> Orleans was an elevation issue) but if there are others using 3-d
> coordinates, how are you handling the elevation coordinate.  We
> previously had our data in an object data file using a point object that
> had x,y,z fields - I guess we could duplicate that in a postgres table
> or use the eWRT in a geometry column.  Any experiences ?
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