[Mapserver-users] postgis and 4d data in mapserver
David Blasby
dblasby at refractions.net
Fri Jun 25 13:46:44 PDT 2004
David Bitner wrote:
> Off topic at first, but there are a number of PostGIS folks here too:
>
> I am looking at using postgis to work with airport traffic data. As part of
> this I need a time and elevation component. What is the best way to work
> with four dimensional data in postgis? What is an example of a query that
> would access either the elevation or the time component of the geometry?
>
> The next step of course, is creating a mapserver app. perhaps with flash, to
> display an animation of flights going over an area over a certain period of
> time. And also to be able to select the flight tracks by a line to get a
> cross section of the elevations the planes are at a certain point. But,
> it's sometimes best to take things one step at a time. Any and all pointers
> of course would be greatly appreciated.
>
The new "LWGEOM" PostGIS type support (x,y), (x,y,z), and (x,y,m,z)
points, lines, polygons, and mulit* geometries.
See the postgis mailing list for more details.
NOTE: LWGEOMs are still in BETA (not many people are using them, so they
are not well tested).
dave
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