作者:标准资料网 时间:2024-05-18 04:02:34   浏览:8263   来源:标准资料网

MIL-STD-2407, DEPARTMENT OF DEFENSE INTERFACE STANDARD: VECTOR PRODUCT FORMAT (28 JUN 1996) [SUPERSEDING MIL-STD-600006]., The vector product format (VPF) is a standard format, structure, and organization for large geographic databases that are based on a georelational data model and are intended for direct use. VPF is designed to be compatible with a widevariety of applications and products. VPF allows application software to read data directly from computer-readable media without prior conversion to an intermediate form. VPF uses tables and indexes that permit direct access by spatial location and thematic content and is designed to be used with any digital geographic data in vector format that can be represented using nodes, edges, and faces. VPF defines the format of data objects, and the georelational data model provides a data organization within which software can manipulate the VPF data objects. A product specification corresponding to a specific database product determines the precise contents of feature tables and their relationships in the database. In this context, each separate product or application is defined by a product specification and implemented by using VPF structures.