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

[Ed McNierney]

Sean -

There are a couple of Northwest Airlines pilots on leave right now
because they, too demanded - and got - maximum precision.  They forgot
that they SHOULD have been demanding maximum *accuracy*....

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com
-----Original Message-----
From: mapserver-users-admin at lists.gis.umn.edu
[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of Sean
Gillies
Sent: Friday, June 25, 2004 5:08 PM
To: David Blasby
Cc: Mapserver-Users at Lists. Gis. Umn. Edu; David Bitner
Subject: Re: [Mapserver-users] postgis and 4d data in mapserver

On Jun 25, 2004, at 2:46 PM, David Blasby wrote:

> 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

Hey, I fly on planes!  I *demand* maximum precision. :)

David, mapserver is for drawing pictures of spatial data.  It's great at
what it does, but it's not an N dimensional visualization environment.

cheers,
Sean

--
Sean Gillies
sgillies at frii dot com
http://users.frii.com/sgillies

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