geographic feature data 中文意思是什麼

geographic feature data 解釋
地理特徵數據
  • geographic : adj. 地理學的,地理的。adv. -ically
  • feature : n 1 形狀,外形;特色;(特指)好看的外表;〈pl 〉臉形;五官;面目,容貌,面貌,相貌。2 臉面的一部...
  • data : n 1 資料,材料〈此詞系 datum 的復數。但 datum 罕用,一般即以 data 作為集合詞,在口語中往往用單數...
  1. As far as model is concerned, the forth generation software should be characterized with spatial entity - oriented. the paper established the geographic spatial model based on the thinking of object - oriented ; studied the structure of the model " s elementary unit - - geographic entity ; brought forward the concept of geometric data type which characterize entity ' s spatial feature in the structure ; defined five kinds of geometric data types such as point, arc, area, composite arc, composite area ; and formalized their collective operation using hypergraph. at the end of this paper writer studied preliminarily the method of entity query and analysis based on the model

    本論文從面向對象的基本思想出發,建立了面向對象的地理空間模型;研究了地理空間模型中的基本單位? ?地理實體的結構,針對實體結構中用來表徵實體空間特性的組成部分? ?幾何對象,提出了其取值范圍,即幾何數據類型的概念;對點、弧、面、復合弧和組合面五種幾何數據類型進行了定義;並使用超圖工具對幾何數據類型的集合操作進行了形式化描述;對基於面向對象的地理空間模型的實體查詢和分析方法也做了初步研究。
  2. In the case of data index, the paper generalizes several advanced data index at the present time and analyzes the feature of data index based on database emphatically. then it illustrates the spatial ordering quad - tree index based on database of gde. in the case of geographic data management, the paper studies and tests several primary technologies, such as data concurrent access, data storage, data query, data update and maintenance, data transmission and data buffer, and so on

    數據模型方面,在對常見的數據模型進行描述和分析的基礎上,提出了滿足海量數據高效存儲和管理的gde數據模型,通過實驗對數據的存放方式和效率進行了測試;數據索引方面,歸納總結了當前提出的較為先進的幾種數據索引方法,尤其是著重分析了基於數據庫的數據索引的特點,並對gde基於數據庫的可排序四叉樹索引進行了重點闡述;地理數據管理方面,對數據並發訪問、數據查詢、數據更新與維護、數據傳輸以及數據緩存等關鍵技術進行了闡述和實踐;地理數據訪問對象方面,介紹了採用面向對象技術設計實現的地理數據訪問類。
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