Oracle Spatial: Spatial Concepts

http://www.cnblogs.com/mjgforever/archive/2007/12/24/1012440.html
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