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
- nutrition function claims
- nutrition health
- nutrition in high temperature environment
- nutrition in low illumination environment
- nutrition in low temperature environment
- nutrition in special conditions
- nutrition labeling
- nutrition of flour gluten fortifier
- nutrition of lactating women
- nutrition of young child
- nutrition problem
- nutrition related disease of the aged
- nutrition-related diseases
- nutrition research on the aged
- nutrition solution experiment
- nutrition supplement in competition period
- nutrition survey
- nutrition therapy
- nutritive feed additive
- nutritive organ
- nutritive types of grassland
- nut shell charcoal
- nuts nutrition
- Nuuk
- NUVEL relative plate tectonics model