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
- sandstorms in China
- Sandu
- San Du Da Guan
- Sandu Dao
- Sanduotang theatre at Family Cao's Courtyard
- Sandu Shuizu Zizhixian
- sand wash
- sand waves
- sandwich
- sandwich biscuit
- sandwich compound
- sandwich coordination compound
- sandwich course
- sandwich hologram
- sandwich hologram interferometry
- sandwich immunoassay
- sandwiching
- sandwich matrix
- sandwich plate
- sandwich plates and shells
- sandwich polarization
- sandwich structure
- sandwich structure adhesive
- sandwich theorem
- sand worm