[Freegis-list] Re: 3D file format for GIS (BABA Yoshihiko)

[Stefan F. Keller]

Dear BABA 

freegis-list-request at intevation.de wrote:
> Date: Tue, 23 Oct 2001 12:40:59 +0900
> To: itsumi at ae.wakwak.com
> From: BABA Yoshihiko <baba at daido-it.co.jp>
> Cc: freegis-list at intevation.de, postgis at yahoogroups.com, grassu-j at media.osaka-cu.ac.jp
> Subject: [Freegis-list] 3D file format for GIS
> 
> Hi all,
> 
> Are there any documents/discussions on 3D GIS file formats?
> 
> I am currently involved in a project to make a 3D dataset for an entire country. For the very first stage, we need to create an original dataset. As far as I know, however, there are some issues with the existing 3D formats for GIS use such as:
> 
> 1 no consideration on different coordinate systems
> 2 little consideration on scales and precisions
> 3 query optimisation
> 
> And I am currently discussing an original format in a very simple XML, but probably not GML/GXML. Also not VRML, geoVRML or similar formats due to its incapability of the issues.
> 
> My question is:
> 
> Are there any discussion/document for these issues, preferably available online? Or if anyone is good at them, please give us some advice.
> 
> Thank you in advance.
...
>   BABA Yoshihiko  $BGO>lH~I'(B       x
>   IT Project                           x
>   Daido Information Technology         x
>   +81 (0)3 3316 8321                   x
>   http://www.daido-it.co.jp            x

I'd be interested in discussing such a format. I'm a nominated Swiss
ISO/TC211 expert and Switzerland has been mandated to establish a woking
group in order to defin a profile on the ISO spatial schema.

First of all, I have following obeservations and questions:
* obviously you don't mention the ISO format, why not?
* you don't consider the GML format neither (it is not yet really 3D,
isnt'it?)

But the most important question probably is: what are your requirements
really?
I can't follow your requirements: you mention an original format, which
ought to be a very simple XML and then you mention query optimization.
Isn't this a contradiction? What do you mean with "no consideration on
different coordinate systems"?

My point of interest is, getting an XML format which is based on a
generic, basic 3D geometry type.
This seems to be the most challenging issue. All other issues, we think,
already have been solved - at least as INTERLIS 2 has showed us.
INTERLIS 2 is 2.5D, XML, UML and ISO compatible and easy to convert to
GML, see www.interlis.ch).

Regards,
-- Stefan Keller
___________________________________________________________________
Prof. Stefan F. Keller, Computer Science Department
Institute ITA, integrated Geo-information Systems (int>e>gis)
University of Applied Sciences Rapperswil (ITA-HSR)
CH-8640 Rapperswil, Tel. +41 55 222 47 46 
mailto:sfkeller at hsr.ch, http://www.hsr.ch and http://www.integis.ch
___________________________________________________________________
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