Standards Forum

CDB Spec - Request

2010-04-23T10:29:08-05:00

Is there anyplace to get parts of the spec in XML form? Specifically looking for a complete FACC listing in XML form.

Thanks,
Sam

Road Network

2013-03-13T07:15:45-05:00

Hello,

I included a shape file with the road network of a 30x30 Km area, inside the Culture Data of a CDB.
I just applied a ‘code’ attribute with ‘AP030’ value on all the lines.
I need to use this road network for the Stage’s road following (ground navigation).
The trouble is that this road network doesn’t work well: for example, I want that an entity could reach a target, but the entity can’t calculate the route.
I read on the CDB Specification that the road network needs two attributes that identifies the junction between two roads: SJID (Starting Junction ID) and EJID (Ending Junction ID). Anybody knows if TerraVista could add these attributes during the build?

Thanks

Alessandro

Buildings in CDB

2010-09-01T05:32:20-05:00

Hi,

We have vector data for an urban area comprising approx 30,000 footprints of buildings.

In previous terrain database formats these footprints have been extruded (based upon a ‘height’ atttribute) and textured (based upon a ‘building type’ attribute).

What is the crrently recommended way of representing this information in CDB?

The spec seems to suggest that the FACC codes associated with buildings should exist as point features rather than areal - but to achive correlation with our existing databases this would presumably require us to generate 30,000 geo-specific building models, which doesn’t sound like fun!

Is there a ‘correct ’ way to represent these individual buildings as areal features?

Thanks,
Andy Stannard
BAE SYSTEMS

optimum parameters for generating CDBOutput and rendering parameters for VP

2012-11-02T01:12:09-05:00

Hi,

I am in the process of generating a very high quality-large area terrain through Terra-Vista. Currently, I am generating .mft and cdb as my output types to cross check optimum rendering in Vega-Prime. Need expert opinions on following points:

1) what should be the Project Parameters for cdb output in TV? I mean, how many LODs do i need to fix (if my observer never comes down below 20km!)
2) CDBOutput is taking huge disk space as compared to .mft!!
3) There is a rendering delay for CDBOutput in VP whereas .mft renders instantly

any suggestion would be greatly appreciated

Thanks

Additional light types in CDB

2012-04-13T16:02:15-05:00

Well, since my last proposal didn’t generate any negative comments, lets try another one. We would like to see more obstruction light types. In particular, we would like to see all the FAA official obstruction light types.

I am not sure if I added the lights in the proper order/hierarchy that CDB uses (I tried to use what I thought was the way the standard was created). If not, it can get reordered and renamed to fit better with the existing light names/hierarchy. I am more concerned that the light types get in, so we can better support existing obstruction lights that exist in the real world.

Thanks!
Ryan

Model complexity metrics

2010-09-23T14:03:59-05:00

Continuing from where this post left off:

RyanFranz - 16 December 2009 05:48 PM
Another example is the load information (NIS, NIX, NNL, NTC, NTX, NVT). In a class-level attribute, they would take 39 bytes per model, but in the extended attribute file they would take 204 bytes per model. Unless most of your models shared identical load parameters, this causes the RTP to load much more data. We still intend to keep using them, because they are the only load management information about the model (short of loading the actual model), but we would prefer to keep them as a class-level attribute.

Since the attribution above has been deprecated in CDB 3.1, what analogous new attribution to convey model complexity for RTP capacity/load management will be available in CDB 3.2?

character animation and Life Forms

2010-07-05T03:32:32-05:00

Hello
I have a few characters with animation and i want to merge them into CDB format
The character are in X format using skin and bipd skeleton.
Is there any way to convert them into CDB Format?

Raster Material Mixture layer compression

2011-10-10T16:58:56-05:00

I mentioned an easy way to compress the raster material mixture layer several months ago. Anyway, I wrote it up in an draft proposal format, which is attached to this message. Can this proposal be considered to be put into the CDB 3.2 specification? Also, any feedback is welcome.

CDB 3.2 Highlights

2012-10-14T11:01:30-05:00

Please note that there is a list of highlights from the proposed 3.2 draft specification in the CDB Drafts Discussion forum.

The full 3.2 draft will be posted in the coming weeks.

I would encourage everyone to attend the CDB User Group meeting at I/ITSEC and join the discussion on the 3.2 draft.

CDB User Group Presentation - ITSEC 2011

2012-01-13T08:39:59-05:00

Here is the presentation from the CDB User Group at ITSEC 2011.