Bounding Sphere Radius BSR CDB Extended Attribute Index CEAI

236 © 2016 Open Geospatial Consortium 14 Non-capital City 15 Time Zone Delimiter 16 International Date Line 17 Capital City 997 Unpopulated 998 Not Applicable 999 Other

5.7.1.3.10 Bounding Sphere Radius BSR

Description: The radius of a feature. In the case where a feature references an associated 3D model, it is the radius of the hemisphere centered at the model origin and that bounds the portion of the model above its XY plane, including the envelopes of all articulated parts. Note that for 3D models used as cultural features, the XY plane of the model corresponds to its ground reference plane. The value of BSR should be accounted for by client-devices in combination with other information to determine the appropriate distance at which the model should be paged-in, rendered or processed. When the feature does not reference a 3D model, BSR is the radius of the abstract point representing the feature e.g., a city. ● Identifier: BSR ● Code: 0010 ● Data Type: numeric ● Length: 9 characters ● Format: floating-point recommended precision 5.3 ● Range: 0.000 to 99,999.999 ● Usage Note: Mandatory for features for which a MODL has been assigned, but optional for geopolitical point features. The dimension of the bounding sphere is intrinsic to the model and identical for all LOD representations. Refer to Section 6.3 Volume 7: CDB Data Model Guidance formerly Appendix A – “How to Interpret the AHGT, HGT, BSR, BBH, and Z Attributes” for additional usage guidelines. ● Unit: meters ● Default: None ● Compatibility: OGC CDB 1.0

5.7.1.3.11 CDB Extended Attribute Index CEAI

Description: An index that points to a row entry of a CDB Extended Attribution file for the current dataset. This entry permits users to store an index to a link list set of CDB-specific attributes. CDB-compliant devices must be capable of reading and interpreting this field. Usage of this attribution is not portable to other simulators because it falls outside of the documented CDB attribution scheme. The CDB Extended Attribution file should be located in the same directory as the instance-level attribution file. An empty CEAI attribute is allowed. Note that the first entry in the CDB Extended Attribution file has an index of 1. ● Identifier: CEAI 237 © 2016 Open Geospatial Consortium ● Code: 0011 ● Data Type: numeric ● Length: 6 characters ● Format: integer ● Range: 1 to 999,999 ● Usage Note: Optional. Use when CDB extended attribution is required. A “blank” or a value of 0 indicates that there are no CDB Extended attributes. ● Unit: NA ● Default: None ● Compatibility: OGC CDB 1.0.

5.7.1.3.12 CDB Extended Attribute Code CEAC – Deprecated