NDLI: The lifespan model of GIS data representation over scale space

Content Provider	IEEE Xplore Digital Library
Author	Tinghua Ai Jingzhong Li
Copyright Year	2009
Description	Author affiliation: School of Resource and Environment Science, Wuhan University, China (Tinghua Ai; Jingzhong Li)
Abstract	Multi-scale representations of spatial data is one of the key technologies in GIS applications. It plays an important role in such applications as seamless data navigation, progressive web transfer and self-adaptable visualization. This paper aims at the objective by small size of data volume to realize high granularity multi-representation, presenting a data model, namely the lifespan model over scale space, to divide the spatial data into different representation scene over scale space. To construct the object-oriented model of representation lifespan, we consider that during the whole life time [S0, Sn], an object has some base representations g0, g1⋯gm, which related to some key happening point s0, s1⋯sm over scale space. An essential evolution of the representation arises at each key happening point, such as from polygon to polyline. But between two adjacent key scale points Si and Sj, the evolutions of the representation are smooth. So the middle representations between [Si, Sj] can be derived by a transformation function f. Based on this consideration, the scale based transformation is defined as a tri-tuple: Tij: ≪fi, [Si1, Si2], {gij}≫, where fi is the transformation function, [Si1, Si2] the scale range controlled by two key scale points Si1 and Si2 and {gij} the base representation status associated with the key scale point of Si1 or Si2. Then the representation of the object at any scale Sx can be formulized as: Rx=fi({gij},x). Considering the transformation properties of gradual change vs. abrupt change, we summarize four types of transformation functions. They are (1) traditional map generalization, (2) interpolation (morphing) transformation, (3) LOD accumulation and (4) equal transformation.
Starting Page	1
Ending Page	6
File Size	608801
Page Count	6
File Format	PDF
ISBN	9781424445622
DOI	10.1109/GEOINFORMATICS.2009.5293369
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Geographic Information Systems Navigation Object oriented modeling Map generalization Multi-scale representation Spatial data model Spatial databases Visual databases Graphics Earth Space technology Scale transformation Data visualization Data models
Content Type	Text
Resource Type	Article

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