Oracle Spatial: Spatial Concepts
[url]http://www.cnblogs.com/mjgforever/archive/2007/12/24/1012440.html[/url]
1 Oracle Spatial 是什么？
提供SQL schema 和 functions 以方便存储、取回、更新和查询空间特性的集合。
MDSYS提供了地理数据的类型
2 Object-Relational Model
SDO_GEOMETRY
支持arcs, circles, compound polygons, compound line strings, and optimized rectangles
3 Spatial Data
例如交通图
4 Geometry Types
Points、point clusters
Line strings
n-point polygons
Arc line strings
Arc polygons
Compound polygons
Compound line strings
Circles
Optimized rectangles
5 Data Model
elements, geometries, layers 所组成的等级结构。
element: points, line strings, polygons
Geometry: An example of a geometry might describe the buildable land in a town.
Layer: A layer is a collection of geometries having the same attribute set.
Coordinate System: Cartesian coordinates, Geodetic coordinates, Projected coordinates, Local coordinates
Tolerance: Tolerance is used to associate a level of precision with spatial data.
6 Query Model
两级过滤。Primary filter, secondary filter.
7 Indexing of Spatial Data
R-tree index
8 Spatial Relationships and Filtering
SDO_RELATE: 评价拓扑标准 nine-intersection model between points, lines, and polygons (interior, a boundary, and an exterior.)
SDO_WITHIN_DISTANCE: 两个空间对象是否在一个距离范围内。
SDO_NN: 离某个空间对象最近的一个对象
9 Spatial Operators, Procedures, Functions
Spatial operators: such as SDO_FILTER and SDO_RELATE
Spatial procedures and functions: SDO_GEOM, SDO_CS, and SDO_LRS.
10 Spatial Aggregate Functions
SDO_AGGR_MBR
SDO_AGGR_UNION
11 Geocoding
一个从地址表中转换到标准地址、位置等的过程。
12 Spatial Java Application Programming Interface
oracle.spatial.geometry
oracle.spatial.network
oracle.spatial.topo
oracle.spatial.util
13 MDDATA Schema
14 Performance and Tuning Information
http://www.oracle.com/technology/products/spatial/
15 Open Geospatial Consortium (OGC) Conformance
Features Specification 1.1.1
SQL92
16 Spatial Release (Version) Number
SELECT SDO_VERSION FROM DUAL;
17 Spatial Application Hardware Requirement Considerations
18 Spatial Error Messages
Oracle Database Error Messages
19 Spatial Examples
readgeom.c and readgeom.h
writegeom.c and writegeom.h
转载自：https://blog.csdn.net/nlslzf/article/details/83460310
