矢量數(shù)據(jù)模型ppt課件(參考版)
2025-05-07 07:49本頁面
【正文】 option to have 256 TB per table Geodatabase數(shù)據(jù)結(jié)構(gòu) ? 分為 feature class 和 feature dataset ? 一種要素類僅存儲相同的幾何要素 ? 一個要素集存儲的要素類，它們具有相同的坐標(biāo)系統(tǒng)和地理范圍 ? 要素類可以不在要素數(shù)據(jù)集中 ? 獨立要素類 Geodatabase 數(shù)據(jù)結(jié)構(gòu) Additional geodatabase elements Parcel fabrics Terrain datasets Representations Locators Feature Classes Behavior Attribute defaults Connectivity rules Attribute domains Relationship rules Split/merge policy Topology rules Feature dataset Spatial reference Relationship classes Topology Geometric works Polygon Route Line Dimension Point Annotation Raster Datasets Toolboxes Tool Model Script Network datasets Tables Geodatabase Feature Dataset ? 存放地理對象的容器 相同的空間參照 ? 類似于 coverage 限制更少 ? 包含幾何網(wǎng)絡(luò)、拓?fù)?、地形? 關(guān)系類可選 ParcelCorner Parcel ParcelAnno LotLines Parcel_Topo LotDimensions Subdivision BoundryLines Features and Feature Classes ? 建立關(guān)系模型 ? 一個要素是一個地理對象 ? 一個要素是地理要素集的實例 ? 擴展的關(guān)系模型 幾何屬性類型 A feature class is a table of rows, where each row has a geographic column Objects and Object Classes – Tables ? 屬性表按照對象和對象類組織 對象是具有屬性和表現(xiàn)的實體 一個對象是對象類的實例 對象類的所有對象具有相同的屬性和表現(xiàn) Geodatabase特點 ? Point, lines, polygons Single and multipart features ? Text and surfaces ? Flexible coordinates XY, Z, M One record in feature class table Feature with many parts Raster and Imagery ? 支持多種數(shù)據(jù)格式 Tiff, bmp, GRID, among others ? 表的屬性域 ? Mosaic dataset 管理柵格數(shù)據(jù) Stored as a catalog, viewed as a mosaic Advanced querying and processing 拓?fù)湟?guī)則 ? Geodatabase的拓?fù)湟?guī)則特點 關(guān)系規(guī)則，存放在要素數(shù)據(jù)集 即時拓?fù)?——使用時再建立，不再與地理要素捆綁 ? 定義了 25條拓?fù)湟?guī)則，見下表 Topology rules in the geodatabase data model Feature Type Rule Polygon must not overlap, must not have gaps, must not overlap with, must be covered by feature class of, must cover each other, must be covered by, boundary must be covered by, area boundary must be covered by boundary of, and contains point Line must not overlap, must not intersect, must not have dangles, must not have pseudonodes, must not intersect or touch interior, must n
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