[Freegis-list] 3D file format for GIS

[BABA Yoshihiko]

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.

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x							x
x	BABA Yoshihiko	馬場美彦		x
x	IT Project					x
x	Daido Information Technology		x
x	+81 (0)3 3316 8321 				x
x	http://www.daido-it.co.jp			x
x							x
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx