工学 空间数据模型 释 spatial data model 空间数据模型 地理信息系统（GIS）中空间数据组织的概念和方法。反映现实世界中空间实体及其相互之间的联系，是描述GIS空间数据组织和进行空间数据库设计的理论基础。
数据库 数据库理论 释文 spatial data model 空间数据模型
- RADA
- Radama I reform
- radar
- radar absorbing material
- radar absorbing materials
- radar active jamming pattern
- radar altimeter
- radar ambiguity function
- radar antenna
- radar anti-jamming
- radar anti-reconnaissance
- radar area related guidance
- radar astronomy
- radar beacon
- radar beam riding guidance
- radar beam riding semi-active radar homing combined guidance
- radar camouflage
- radar carrier frequency
- radar chart
- radar clutter
- radar control
- radar countermeasure system
- radar cross section
- radar cross section measurement
- radar cross section of target