[Mapserver-users] postgis and 4d data in mapserver

[David Blasby]

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