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
- three center bond
- three-center bond
- three-centered curve
- three center hydrogen bond
- three center two electron bond
- three center-two electron bond
- three-channel double-balloon catheter
- Three-Character Classic
- Three-Character Operetta
- Three-Charater Verse on Tuina
- Three Chivalrous Swordsmen by Ren Yi
- three-choice polygon
- three-choice walk
- three-chord lemma
- Three Chuanqi Plays of Wan Shu
- Three Chuanqi Stories of the Anxianglou Edition
- Three Chuanqi Stories of the Sturdy Grass Hall
- Three Circles
- three circles of information architecture
- three-circles theorem
- three close
- Three coining offices of shanglin
- three collections and five unified management
- three-colorable
- three-colorable graph