JPEG 2000 .jp2: used for the representation of an image encoded in accordance to 3D Models: Currently OpenFlight is used for the representation of 3-dimensional Vector features and geometry: Currently ShapeFiles are used for the representation Extensib

126 © 2016 Open Geospatial Consortium fully compliant with the SGI Image File Format Specification. Its use is limited to 3D models.

4. JPEG 2000 .jp2: used for the representation of an image encoded in accordance to

the JPEG 2000 standard. CDB-compliant JPEG 2000 readers must be fully compliant with the JPEG 2000 standard while reading such still image file types. JPEG 2000 encoded images can be used for the representation of geo-referenced terrain imagery with some degree of compression levels and is only applicable in the case of terrain raster imagery. Volume 2 CDB Core: Model and Physical Structure: Annexes C and H describe the use of the JPEG 2000 file format in a CDB data store.

5. 3D Models: Currently OpenFlight is used for the representation of 3-dimensional

geometric representation of all models statically positioned cultural models, moving models. Please refer to the requirements described in Volume 6 OGC CDB Rules for Encoding Data using OpenFlight need URL.

6. Vector features and geometry: Currently ShapeFiles are used for the representation

and attribution of the vector feature datasets in a CDB data store. Please see the requirements described in Volume 4: OGC CDB Best Practice use of Shapefiles for Vector Data Storage.

7. Extensible Markup Language .xml: used to store metadata that describes CDB

versioning, describes CDB Composite and Base material structure, defines CDB light type naming conventions and hierarchy, and defines CDB model component hierarchy.

8. Cross-platform and interoperable file storage and transfer format .zip: used to

archive and store geospecific 3D model datasets. For all other formats used by this standard, CDB readers should be fully compliant 29 . File Format Versions Currently Supported by CDB CDB Client-device Behavior for Prior Versions .tif 6.0 Ignores data .rgb 1.0 Ignores data .jp2 1.0 Ignores data .flt 16.0 Ignores data .shp, .shx Esri White Paper, July 98 Ignores data .dbf, .dbt dBASE III+ and above Ignores data .xml 1.0 Ignores data .zip 6.3.1 Ignores data 29 This table will be expanded as Best Practices for additional formats and encodings are developed. 127 © 2016 Open Geospatial Consortium

5. CDB Datasets