[postgis-users] Old question resurfacing

[Rémi Cura]

The LOD problem is much more complicated for city, because you hit the
"generalization" problem.
To simplify : there is currently no satisfactory automated way to generate
complex 3D or 2D geographic information in multiple level of details.
It is actively researched.

The closest format we have for 3D city model is CityGML (
http://www.citygml.org/).
It is a de facto standard currently.
It contains 4 LOD. Those are more semantic LOD and not very suitable for
massiv data.

Truth to be told, we don't even have a standard way of storing 3D model (+
texture, + semantic) in DB.

Current postgis type are far from sufficient, and it would need a more high
level structure (several tables and types linked)

Cheers,

Rémi-C


2013/12/18 Stephen Mather <stephen at smathermather.com>

> I've played a bit with X3DOM-- it's great for meshes, etc., but I haven't
> seen a good way to color point clouds in it (although, perhaps I'm missing
> something).  Still powerful though, and can leverage ST_AsX3D function.
>
> Best,
> Steve
>
>
>
>
> On Wed, Dec 18, 2013 at 3:30 AM, Frank Henze <henze at tu-cottbus.de> wrote:
>
>> Hi,
>>
>> thanks for this very interesting approach!
>>
>> We need LOD not only for point clouds, but also for large 3D models (e.g.
>> 3D city models / CityGML). Is there a solution for PostGIS?
>>
>> Interesting approaches for visualization of large 3D can also find on
>> X3DOM (see homepage and search on Youtube).
>>
>> Frank
>>
>>
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