中南大學(xué)測繪工程地理信息系統(tǒng)雙語課程復(fù)習(xí)基本概念整理-wenkub.com
2024-10-15 10:17 本頁面
【正文】 2： Linear interpolation: simple straight line based on two points is used。 4Display a region might require scanning several adjacent polygons and erasing their mon boundary。 2Is inefficient for classes of spatial analysis wherespatial relationships are important 3Inefficient in space utilization since there is redundant duplication of data 網(wǎng)絡(luò)模型優(yōu)缺點 Evaluation to the work model Advantage: intrinsic description of a worked topology, with the notion of connectivity useful for optimalpaths search. Disadvantages: No information on the relationships between 2D objects is stored in this model 拓?fù)淠Ｐ蛢?yōu)缺點 The advantages of topological model 1Be efficient putation of topological queries。s summary information identification, circumrectangle and pointing to a pointer to the spatial object entity SAM： Spatial Access Methods SAM uses an explicit structure, called a spatial index(空間索引 ) MBB:Most monly used approximation is the minimum bounding rectangle of the objects39。 2） Information: knowledge, represented by data, or ing from data 3） Geographic Information: the information about the geographic entities(實體 ). Such as the location, attribute（特性） ,number, quality, relationship, and rules of geographic entities(實體 ). Object: physical representation of an entity Instance: A particular occurrence of a given type, for example a house Spatial type: point, line, area, etc Attribute: Descriptive characteristics of an entity Feature: a bination of several entities making up a plex unit Entity class: Category of entities with some similarity, for example all educational buildings. Attribute class: Category prising similar attribute, for example grades of students Attribute value: particular measure of an attribute for an instance of an entity, for example, number of students, or type school Spatial entities:空間實體 Entities: refer to the phenomenon that can not be subdivided into like units. Identifier 。 provides a means to refer to different entities, although it is possible that the naming system used is not very precise, consistent or able to guarantee uniqueness 對象 Object: physical representation of an entity Instance: A particular occurrence of a giventype, for example a house Spatial type: point, line, area, etc Attribute: Descriptive characteristics of an entity 中南大學(xué)楊俊山整理 DATA:(數(shù)據(jù) ): Data refers to a goal39。 geometry, or minimal bounding box,denoted MBB 插值法： Interpolation: data for one or more points in space are used to produce estimated values for other positions at which it is not possible to record values directly. 外推法： Extrapolation: when we are outside the range of data points 3DGIS:三維地理信息系統(tǒng) 3DGIS is one of GIS which using the 3S technology (GIS, GPS, RS), 3d visualization technology (VR), puter technology on earth space information coding, storage, conversion, analysis and display information system, achieve the true 3d description\visualization and analysis\management 利用 3S 技術(shù) (GIS、 GPS、 RS)、三維可視化技術(shù)（ VR）、計算機(jī)技術(shù)等對地球空間信息進(jìn)行編碼、存儲、轉(zhuǎn)換、分析和顯示的信息系統(tǒng)，真三維描述、可視化和分析管理的地理信息系 統(tǒng) WEBGIS（網(wǎng)絡(luò)地理信息系統(tǒng)）指基于 Inter 平臺，客戶端應(yīng)用軟件采用網(wǎng)絡(luò)協(xié)議，運用在 Inter 上的地理信息系統(tǒng)。 2Because of object sharing, consistency maintenance and updates are easier。 5The input of new object
公司管理相關(guān)推薦
鄂ICP備17016276號-1